11 files changed, 563 insertions, 366 deletions

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index b87a63b..1b31c13 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1835,13 +1835,8 @@ void __audit_getname(const char *name)
 	context->names[context->name_count].ino  = (unsigned long)-1;
 	context->names[context->name_count].osid = 0;
 	++context->name_count;
-	if (!context->pwd.dentry) {
-		read_lock(&current->fs->lock);
-		context->pwd = current->fs->pwd;
-		path_get(&current->fs->pwd);
-		read_unlock(&current->fs->lock);
-	}
-
+	if (!context->pwd.dentry)
+		get_fs_pwd(current->fs, &context->pwd);
 }
 
 /* audit_putname - intercept a putname request
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index d83cab0..192f88c 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1102,7 +1102,7 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
 			if (opts->release_agent)
 				return -EINVAL;
 			opts->release_agent =
-				kstrndup(token + 14, PATH_MAX, GFP_KERNEL);
+				kstrndup(token + 14, PATH_MAX - 1, GFP_KERNEL);
 			if (!opts->release_agent)
 				return -ENOMEM;
 		} else if (!strncmp(token, "name=", 5)) {
@@ -1123,7 +1123,7 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
 			if (opts->name)
 				return -EINVAL;
 			opts->name = kstrndup(name,
-					      MAX_CGROUP_ROOT_NAMELEN,
+					      MAX_CGROUP_ROOT_NAMELEN - 1,
 					      GFP_KERNEL);
 			if (!opts->name)
 				return -ENOMEM;
diff --git a/kernel/cred.c b/kernel/cred.c
index 60bc8b1..9a3e226 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -22,10 +22,6 @@
 #define kdebug(FMT, ...) \
 	printk("[%-5.5s%5u] "FMT"\n", current->comm, current->pid ,##__VA_ARGS__)
 #else
-static inline __attribute__((format(printf, 1, 2)))
-void no_printk(const char *fmt, ...)
-{
-}
 #define kdebug(FMT, ...) \
 	no_printk("[%-5.5s%5u] "FMT"\n", current->comm, current->pid ,##__VA_ARGS__)
 #endif
diff --git a/kernel/exit.c b/kernel/exit.c
index ceffc67..671ed56 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -771,9 +771,12 @@ static void forget_original_parent(struct task_struct *father)
 	struct task_struct *p, *n, *reaper;
 	LIST_HEAD(dead_children);
 
-	exit_ptrace(father);
-
 	write_lock_irq(&tasklist_lock);
+	/*
+	 * Note that exit_ptrace() and find_new_reaper() might
+	 * drop tasklist_lock and reacquire it.
+	 */
+	exit_ptrace(father);
 	reaper = find_new_reaper(father);
 
 	list_for_each_entry_safe(p, n, &father->children, sibling) {
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 131b170..c0613f7 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -151,8 +151,10 @@ static int do_kimage_alloc(struct kimage **rimage, unsigned long entry,
 	image->nr_segments = nr_segments;
 	segment_bytes = nr_segments * sizeof(*segments);
 	result = copy_from_user(image->segment, segments, segment_bytes);
-	if (result)
+	if (result) {
+		result = -EFAULT;
 		goto out;
+	}
 
 	/*
 	 * Verify we have good destination addresses.  The caller is
@@ -827,7 +829,7 @@ static int kimage_load_normal_segment(struct kimage *image,
 		result = copy_from_user(ptr, buf, uchunk);
 		kunmap(page);
 		if (result) {
-			result = (result < 0) ? result : -EIO;
+			result = -EFAULT;
 			goto out;
 		}
 		ubytes -= uchunk;
@@ -882,7 +884,7 @@ static int kimage_load_crash_segment(struct kimage *image,
 		kexec_flush_icache_page(page);
 		kunmap(page);
 		if (result) {
-			result = (result < 0) ? result : -EIO;
+			result = -EFAULT;
 			goto out;
 		}
 		ubytes -= uchunk;
diff --git a/kernel/kfifo.c b/kernel/kfifo.c
index 35edbe22..4502604 100644
--- a/kernel/kfifo.c
+++ b/kernel/kfifo.c
@@ -1,8 +1,7 @@
 /*
- * A generic kernel FIFO implementation.
+ * A generic kernel FIFO implementation
  *
- * Copyright (C) 2009 Stefani Seibold <stefani@seibold.net>
- * Copyright (C) 2004 Stelian Pop <stelian@popies.net>
+ * Copyright (C) 2009/2010 Stefani Seibold <stefani@seibold.net>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -11,7 +10,7 @@
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
@@ -24,422 +23,579 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/err.h>
-#include <linux/kfifo.h>
 #include <linux/log2.h>
 #include <linux/uaccess.h>
+#include <linux/kfifo.h>
 
-static void _kfifo_init(struct kfifo *fifo, void *buffer,
-		unsigned int size)
-{
-	fifo->buffer = buffer;
-	fifo->size = size;
-
-	kfifo_reset(fifo);
-}
-
-/**
- * kfifo_init - initialize a FIFO using a preallocated buffer
- * @fifo: the fifo to assign the buffer
- * @buffer: the preallocated buffer to be used.
- * @size: the size of the internal buffer, this has to be a power of 2.
- *
+/*
+ * internal helper to calculate the unused elements in a fifo
  */
-void kfifo_init(struct kfifo *fifo, void *buffer, unsigned int size)
+static inline unsigned int kfifo_unused(struct __kfifo *fifo)
 {
-	/* size must be a power of 2 */
-	BUG_ON(!is_power_of_2(size));
-
-	_kfifo_init(fifo, buffer, size);
+	return (fifo->mask + 1) - (fifo->in - fifo->out);
 }
-EXPORT_SYMBOL(kfifo_init);
 
-/**
- * kfifo_alloc - allocates a new FIFO internal buffer
- * @fifo: the fifo to assign then new buffer
- * @size: the size of the buffer to be allocated, this have to be a power of 2.
- * @gfp_mask: get_free_pages mask, passed to kmalloc()
- *
- * This function dynamically allocates a new fifo internal buffer
- *
- * The size will be rounded-up to a power of 2.
- * The buffer will be release with kfifo_free().
- * Return 0 if no error, otherwise the an error code
- */
-int kfifo_alloc(struct kfifo *fifo, unsigned int size, gfp_t gfp_mask)
+int __kfifo_alloc(struct __kfifo *fifo, unsigned int size,
+		size_t esize, gfp_t gfp_mask)
 {
-	unsigned char *buffer;
-
 	/*
-	 * round up to the next power of 2, since our 'let the indices
+	 * round down to the next power of 2, since our 'let the indices
 	 * wrap' technique works only in this case.
 	 */
-	if (!is_power_of_2(size)) {
-		BUG_ON(size > 0x80000000);
-		size = roundup_pow_of_two(size);
+	if (!is_power_of_2(size))
+		size = rounddown_pow_of_two(size);
+
+	fifo->in = 0;
+	fifo->out = 0;
+	fifo->esize = esize;
+
+	if (size < 2) {
+		fifo->data = NULL;
+		fifo->mask = 0;
+		return -EINVAL;
 	}
 
-	buffer = kmalloc(size, gfp_mask);
-	if (!buffer) {
-		_kfifo_init(fifo, NULL, 0);
+	fifo->data = kmalloc(size * esize, gfp_mask);
+
+	if (!fifo->data) {
+		fifo->mask = 0;
 		return -ENOMEM;
 	}
-
-	_kfifo_init(fifo, buffer, size);
+	fifo->mask = size - 1;
 
 	return 0;
 }
-EXPORT_SYMBOL(kfifo_alloc);
+EXPORT_SYMBOL(__kfifo_alloc);
 
-/**
- * kfifo_free - frees the FIFO internal buffer
- * @fifo: the fifo to be freed.
- */
-void kfifo_free(struct kfifo *fifo)
+void __kfifo_free(struct __kfifo *fifo)
 {
-	kfree(fifo->buffer);
-	_kfifo_init(fifo, NULL, 0);
+	kfree(fifo->data);
+	fifo->in = 0;
+	fifo->out = 0;
+	fifo->esize = 0;
+	fifo->data = NULL;
+	fifo->mask = 0;
 }
-EXPORT_SYMBOL(kfifo_free);
+EXPORT_SYMBOL(__kfifo_free);
 
-/**
- * kfifo_skip - skip output data
- * @fifo: the fifo to be used.
- * @len: number of bytes to skip
- */
-void kfifo_skip(struct kfifo *fifo, unsigned int len)
+int __kfifo_init(struct __kfifo *fifo, void *buffer,
+		unsigned int size, size_t esize)
 {
-	if (len < kfifo_len(fifo)) {
-		__kfifo_add_out(fifo, len);
-		return;
+	size /= esize;
+
+	if (!is_power_of_2(size))
+		size = rounddown_pow_of_two(size);
+
+	fifo->in = 0;
+	fifo->out = 0;
+	fifo->esize = esize;
+	fifo->data = buffer;
+
+	if (size < 2) {
+		fifo->mask = 0;
+		return -EINVAL;
 	}
-	kfifo_reset_out(fifo);
+	fifo->mask = size - 1;
+
+	return 0;
 }
-EXPORT_SYMBOL(kfifo_skip);
+EXPORT_SYMBOL(__kfifo_init);
 
-static inline void __kfifo_in_data(struct kfifo *fifo,
-		const void *from, unsigned int len, unsigned int off)
+static void kfifo_copy_in(struct __kfifo *fifo, const void *src,
+		unsigned int len, unsigned int off)
 {
+	unsigned int size = fifo->mask + 1;
+	unsigned int esize = fifo->esize;
 	unsigned int l;
 
+	off &= fifo->mask;
+	if (esize != 1) {
+		off *= esize;
+		size *= esize;
+		len *= esize;
+	}
+	l = min(len, size - off);
+
+	memcpy(fifo->data + off, src, l);
+	memcpy(fifo->data, src + l, len - l);
 	/*
-	 * Ensure that we sample the fifo->out index -before- we
-	 * start putting bytes into the kfifo.
+	 * make sure that the data in the fifo is up to date before
+	 * incrementing the fifo->in index counter
 	 */
+	smp_wmb();
+}
 
-	smp_mb();
-
-	off = __kfifo_off(fifo, fifo->in + off);
+unsigned int __kfifo_in(struct __kfifo *fifo,
+		const void *buf, unsigned int len)
+{
+	unsigned int l;
 
-	/* first put the data starting from fifo->in to buffer end */
-	l = min(len, fifo->size - off);
-	memcpy(fifo->buffer + off, from, l);
+	l = kfifo_unused(fifo);
+	if (len > l)
+		len = l;
 
-	/* then put the rest (if any) at the beginning of the buffer */
-	memcpy(fifo->buffer, from + l, len - l);
+	kfifo_copy_in(fifo, buf, len, fifo->in);
+	fifo->in += len;
+	return len;
 }
+EXPORT_SYMBOL(__kfifo_in);
 
-static inline void __kfifo_out_data(struct kfifo *fifo,
-		void *to, unsigned int len, unsigned int off)
+static void kfifo_copy_out(struct __kfifo *fifo, void *dst,
+		unsigned int len, unsigned int off)
 {
+	unsigned int size = fifo->mask + 1;
+	unsigned int esize = fifo->esize;
 	unsigned int l;
 
+	off &= fifo->mask;
+	if (esize != 1) {
+		off *= esize;
+		size *= esize;
+		len *= esize;
+	}
+	l = min(len, size - off);
+
+	memcpy(dst, fifo->data + off, l);
+	memcpy(dst + l, fifo->data, len - l);
 	/*
-	 * Ensure that we sample the fifo->in index -before- we
-	 * start removing bytes from the kfifo.
+	 * make sure that the data is copied before
+	 * incrementing the fifo->out index counter
 	 */
+	smp_wmb();
+}
 
-	smp_rmb();
+unsigned int __kfifo_out_peek(struct __kfifo *fifo,
+		void *buf, unsigned int len)
+{
+	unsigned int l;
 
-	off = __kfifo_off(fifo, fifo->out + off);
+	l = fifo->in - fifo->out;
+	if (len > l)
+		len = l;
 
-	/* first get the data from fifo->out until the end of the buffer */
-	l = min(len, fifo->size - off);
-	memcpy(to, fifo->buffer + off, l);
+	kfifo_copy_out(fifo, buf, len, fifo->out);
+	return len;
+}
+EXPORT_SYMBOL(__kfifo_out_peek);
 
-	/* then get the rest (if any) from the beginning of the buffer */
-	memcpy(to + l, fifo->buffer, len - l);
+unsigned int __kfifo_out(struct __kfifo *fifo,
+		void *buf, unsigned int len)
+{
+	len = __kfifo_out_peek(fifo, buf, len);
+	fifo->out += len;
+	return len;
 }
+EXPORT_SYMBOL(__kfifo_out);
 
-static inline int __kfifo_from_user_data(struct kfifo *fifo,
-	 const void __user *from, unsigned int len, unsigned int off,
-	 unsigned *lenout)
+static unsigned long kfifo_copy_from_user(struct __kfifo *fifo,
+	const void __user *from, unsigned int len, unsigned int off,
+	unsigned int *copied)
 {
+	unsigned int size = fifo->mask + 1;
+	unsigned int esize = fifo->esize;
 	unsigned int l;
-	int ret;
+	unsigned long ret;
 
+	off &= fifo->mask;
+	if (esize != 1) {
+		off *= esize;
+		size *= esize;
+		len *= esize;
+	}
+	l = min(len, size - off);
+
+	ret = copy_from_user(fifo->data + off, from, l);
+	if (unlikely(ret))
+		ret = DIV_ROUND_UP(ret + len - l, esize);
+	else {
+		ret = copy_from_user(fifo->data, from + l, len - l);
+		if (unlikely(ret))
+			ret = DIV_ROUND_UP(ret, esize);
+	}
 	/*
-	 * Ensure that we sample the fifo->out index -before- we
-	 * start putting bytes into the kfifo.
+	 * make sure that the data in the fifo is up to date before
+	 * incrementing the fifo->in index counter
 	 */
+	smp_wmb();
+	*copied = len - ret;
+	/* return the number of elements which are not copied */
+	return ret;
+}
 
-	smp_mb();
+int __kfifo_from_user(struct __kfifo *fifo, const void __user *from,
+		unsigned long len, unsigned int *copied)
+{
+	unsigned int l;
+	unsigned long ret;
+	unsigned int esize = fifo->esize;
+	int err;
 
-	off = __kfifo_off(fifo, fifo->in + off);
+	if (esize != 1)
+		len /= esize;
 
-	/* first put the data starting from fifo->in to buffer end */
-	l = min(len, fifo->size - off);
-	ret = copy_from_user(fifo->buffer + off, from, l);
-	if (unlikely(ret)) {
-		*lenout = ret;
-		return -EFAULT;
-	}
-	*lenout = l;
+	l = kfifo_unused(fifo);
+	if (len > l)
+		len = l;
 
-	/* then put the rest (if any) at the beginning of the buffer */
-	ret = copy_from_user(fifo->buffer, from + l, len - l);
-	*lenout += ret ? ret : len - l;
-	return ret ? -EFAULT : 0;
+	ret = kfifo_copy_from_user(fifo, from, len, fifo->in, copied);
+	if (unlikely(ret)) {
+		len -= ret;
+		err = -EFAULT;
+	} else
+		err = 0;
+	fifo->in += len;
+	return err;
 }
+EXPORT_SYMBOL(__kfifo_from_user);
 
-static inline int __kfifo_to_user_data(struct kfifo *fifo,
-		void __user *to, unsigned int len, unsigned int off, unsigned *lenout)
+static unsigned long kfifo_copy_to_user(struct __kfifo *fifo, void __user *to,
+		unsigned int len, unsigned int off, unsigned int *copied)
 {
 	unsigned int l;
-	int ret;
-
+	unsigned long ret;
+	unsigned int size = fifo->mask + 1;
+	unsigned int esize = fifo->esize;
+
+	off &= fifo->mask;
+	if (esize != 1) {
+		off *= esize;
+		size *= esize;
+		len *= esize;
+	}
+	l = min(len, size - off);
+
+	ret = copy_to_user(to, fifo->data + off, l);
+	if (unlikely(ret))
+		ret = DIV_ROUND_UP(ret + len - l, esize);
+	else {
+		ret = copy_to_user(to + l, fifo->data, len - l);
+		if (unlikely(ret))
+			ret = DIV_ROUND_UP(ret, esize);
+	}
 	/*
-	 * Ensure that we sample the fifo->in index -before- we
-	 * start removing bytes from the kfifo.
+	 * make sure that the data is copied before
+	 * incrementing the fifo->out index counter
 	 */
+	smp_wmb();
+	*copied = len - ret;
+	/* return the number of elements which are not copied */
+	return ret;
+}
 
-	smp_rmb();
+int __kfifo_to_user(struct __kfifo *fifo, void __user *to,
+		unsigned long len, unsigned int *copied)
+{
+	unsigned int l;
+	unsigned long ret;
+	unsigned int esize = fifo->esize;
+	int err;
 
-	off = __kfifo_off(fifo, fifo->out + off);
+	if (esize != 1)
+		len /= esize;
 
-	/* first get the data from fifo->out until the end of the buffer */
-	l = min(len, fifo->size - off);
-	ret = copy_to_user(to, fifo->buffer + off, l);
-	*lenout = l;
+	l = fifo->in - fifo->out;
+	if (len > l)
+		len = l;
+	ret = kfifo_copy_to_user(fifo, to, len, fifo->out, copied);
 	if (unlikely(ret)) {
-		*lenout -= ret;
-		return -EFAULT;
-	}
+		len -= ret;
+		err = -EFAULT;
+	} else
+		err = 0;
+	fifo->out += len;
+	return err;
+}
+EXPORT_SYMBOL(__kfifo_to_user);
 
-	/* then get the rest (if any) from the beginning of the buffer */
-	len -= l;
-	ret = copy_to_user(to + l, fifo->buffer, len);
-	if (unlikely(ret)) {
-		*lenout += len - ret;
-		return -EFAULT;
+static int setup_sgl_buf(struct scatterlist *sgl, void *buf,
+		int nents, unsigned int len)
+{
+	int n;
+	unsigned int l;
+	unsigned int off;
+	struct page *page;
+
+	if (!nents)
+		return 0;
+
+	if (!len)
+		return 0;
+
+	n = 0;
+	page = virt_to_page(buf);
+	off = offset_in_page(buf);
+	l = 0;
+
+	while (len >= l + PAGE_SIZE - off) {
+		struct page *npage;
+
+		l += PAGE_SIZE;
+		buf += PAGE_SIZE;
+		npage = virt_to_page(buf);
+		if (page_to_phys(page) != page_to_phys(npage) - l) {
+			sg_set_page(sgl, page, l - off, off);
+			sgl = sg_next(sgl);
+			if (++n == nents || sgl == NULL)
+				return n;
+			page = npage;
+			len -= l - off;
+			l = off = 0;
+		}
 	}
-	*lenout += len;
-	return 0;
+	sg_set_page(sgl, page, len, off);
+	return n + 1;
 }
 
-unsigned int __kfifo_in_n(struct kfifo *fifo,
-	const void *from, unsigned int len, unsigned int recsize)
+static unsigned int setup_sgl(struct __kfifo *fifo, struct scatterlist *sgl,
+		int nents, unsigned int len, unsigned int off)
 {
-	if (kfifo_avail(fifo) < len + recsize)
-		return len + 1;
+	unsigned int size = fifo->mask + 1;
+	unsigned int esize = fifo->esize;
+	unsigned int l;
+	unsigned int n;
 
-	__kfifo_in_data(fifo, from, len, recsize);
-	return 0;
+	off &= fifo->mask;
+	if (esize != 1) {
+		off *= esize;
+		size *= esize;
+		len *= esize;
+	}
+	l = min(len, size - off);
+
+	n = setup_sgl_buf(sgl, fifo->data + off, nents, l);
+	n += setup_sgl_buf(sgl + n, fifo->data, nents - n, len - l);
+
+	if (n)
+		sg_mark_end(sgl + n - 1);
+	return n;
 }
-EXPORT_SYMBOL(__kfifo_in_n);
 
-/**
- * kfifo_in - puts some data into the FIFO
- * @fifo: the fifo to be used.
- * @from: the data to be added.
- * @len: the length of the data to be added.
- *
- * This function copies at most @len bytes from the @from buffer into
- * the FIFO depending on the free space, and returns the number of
- * bytes copied.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
- */
-unsigned int kfifo_in(struct kfifo *fifo, const void *from,
-				unsigned int len)
+unsigned int __kfifo_dma_in_prepare(struct __kfifo *fifo,
+		struct scatterlist *sgl, int nents, unsigned int len)
 {
-	len = min(kfifo_avail(fifo), len);
+	unsigned int l;
 
-	__kfifo_in_data(fifo, from, len, 0);
-	__kfifo_add_in(fifo, len);
-	return len;
+	l = kfifo_unused(fifo);
+	if (len > l)
+		len = l;
+
+	return setup_sgl(fifo, sgl, nents, len, fifo->in);
 }
-EXPORT_SYMBOL(kfifo_in);
+EXPORT_SYMBOL(__kfifo_dma_in_prepare);
 
-unsigned int __kfifo_in_generic(struct kfifo *fifo,
-	const void *from, unsigned int len, unsigned int recsize)
+unsigned int __kfifo_dma_out_prepare(struct __kfifo *fifo,
+		struct scatterlist *sgl, int nents, unsigned int len)
 {
-	return __kfifo_in_rec(fifo, from, len, recsize);
+	unsigned int l;
+
+	l = fifo->in - fifo->out;
+	if (len > l)
+		len = l;
+
+	return setup_sgl(fifo, sgl, nents, len, fifo->out);
 }
-EXPORT_SYMBOL(__kfifo_in_generic);
+EXPORT_SYMBOL(__kfifo_dma_out_prepare);
 
-unsigned int __kfifo_out_n(struct kfifo *fifo,
-	void *to, unsigned int len, unsigned int recsize)
+unsigned int __kfifo_max_r(unsigned int len, size_t recsize)
 {
-	if (kfifo_len(fifo) < len + recsize)
-		return len;
+	unsigned int max = (1 << (recsize << 3)) - 1;
 
-	__kfifo_out_data(fifo, to, len, recsize);
-	__kfifo_add_out(fifo, len + recsize);
-	return 0;
+	if (len > max)
+		return max;
+	return len;
 }
-EXPORT_SYMBOL(__kfifo_out_n);
 
-/**
- * kfifo_out - gets some data from the FIFO
- * @fifo: the fifo to be used.
- * @to: where the data must be copied.
- * @len: the size of the destination buffer.
- *
- * This function copies at most @len bytes from the FIFO into the
- * @to buffer and returns the number of copied bytes.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
+#define	__KFIFO_PEEK(data, out, mask) \
+	((data)[(out) & (mask)])
+/*
+ * __kfifo_peek_n internal helper function for determinate the length of
+ * the next record in the fifo
  */
-unsigned int kfifo_out(struct kfifo *fifo, void *to, unsigned int len)
+static unsigned int __kfifo_peek_n(struct __kfifo *fifo, size_t recsize)
 {
-	len = min(kfifo_len(fifo), len);
+	unsigned int l;
+	unsigned int mask = fifo->mask;
+	unsigned char *data = fifo->data;
 
-	__kfifo_out_data(fifo, to, len, 0);
-	__kfifo_add_out(fifo, len);
+	l = __KFIFO_PEEK(data, fifo->out, mask);
 
-	return len;
+	if (--recsize)
+		l |= __KFIFO_PEEK(data, fifo->out + 1, mask) << 8;
+
+	return l;
 }
-EXPORT_SYMBOL(kfifo_out);
-
-/**
- * kfifo_out_peek - copy some data from the FIFO, but do not remove it
- * @fifo: the fifo to be used.
- * @to: where the data must be copied.
- * @len: the size of the destination buffer.
- * @offset: offset into the fifo
- *
- * This function copies at most @len bytes at @offset from the FIFO
- * into the @to buffer and returns the number of copied bytes.
- * The data is not removed from the FIFO.
+
+#define	__KFIFO_POKE(data, in, mask, val) \
+	( \
+	(data)[(in) & (mask)] = (unsigned char)(val) \
+	)
+
+/*
+ * __kfifo_poke_n internal helper function for storeing the length of
+ * the record into the fifo
  */
-unsigned int kfifo_out_peek(struct kfifo *fifo, void *to, unsigned int len,
-			    unsigned offset)
+static void __kfifo_poke_n(struct __kfifo *fifo, unsigned int n, size_t recsize)
 {
-	len = min(kfifo_len(fifo), len + offset);
+	unsigned int mask = fifo->mask;
+	unsigned char *data = fifo->data;
 
-	__kfifo_out_data(fifo, to, len, offset);
-	return len;
+	__KFIFO_POKE(data, fifo->in, mask, n);
+
+	if (recsize > 1)
+		__KFIFO_POKE(data, fifo->in + 1, mask, n >> 8);
 }
-EXPORT_SYMBOL(kfifo_out_peek);
 
-unsigned int __kfifo_out_generic(struct kfifo *fifo,
-	void *to, unsigned int len, unsigned int recsize,
-	unsigned int *total)
+unsigned int __kfifo_len_r(struct __kfifo *fifo, size_t recsize)
 {
-	return __kfifo_out_rec(fifo, to, len, recsize, total);
+	return __kfifo_peek_n(fifo, recsize);
 }
-EXPORT_SYMBOL(__kfifo_out_generic);
+EXPORT_SYMBOL(__kfifo_len_r);
 
-unsigned int __kfifo_from_user_n(struct kfifo *fifo,
-	const void __user *from, unsigned int len, unsigned int recsize)
+unsigned int __kfifo_in_r(struct __kfifo *fifo, const void *buf,
+		unsigned int len, size_t recsize)
 {
-	unsigned total;
+	if (len + recsize > kfifo_unused(fifo))
+		return 0;
 
-	if (kfifo_avail(fifo) < len + recsize)
-		return len + 1;
+	__kfifo_poke_n(fifo, len, recsize);
 
-	__kfifo_from_user_data(fifo, from, len, recsize, &total);
-	return total;
+	kfifo_copy_in(fifo, buf, len, fifo->in + recsize);
+	fifo->in += len + recsize;
+	return len;
 }
-EXPORT_SYMBOL(__kfifo_from_user_n);
-
-/**
- * kfifo_from_user - puts some data from user space into the FIFO
- * @fifo: the fifo to be used.
- * @from: pointer to the data to be added.
- * @len: the length of the data to be added.
- * @total: the actual returned data length.
- *
- * This function copies at most @len bytes from the @from into the
- * FIFO depending and returns -EFAULT/0.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
- */
-int kfifo_from_user(struct kfifo *fifo,
-        const void __user *from, unsigned int len, unsigned *total)
+EXPORT_SYMBOL(__kfifo_in_r);
+
+static unsigned int kfifo_out_copy_r(struct __kfifo *fifo,
+	void *buf, unsigned int len, size_t recsize, unsigned int *n)
 {
-	int ret;
-	len = min(kfifo_avail(fifo), len);
-	ret = __kfifo_from_user_data(fifo, from, len, 0, total);
-	if (ret)
-		return ret;
-	__kfifo_add_in(fifo, len);
-	return 0;
+	*n = __kfifo_peek_n(fifo, recsize);
+
+	if (len > *n)
+		len = *n;
+
+	kfifo_copy_out(fifo, buf, len, fifo->out + recsize);
+	return len;
+}
+
+unsigned int __kfifo_out_peek_r(struct __kfifo *fifo, void *buf,
+		unsigned int len, size_t recsize)
+{
+	unsigned int n;
+
+	if (fifo->in == fifo->out)
+		return 0;
+
+	return kfifo_out_copy_r(fifo, buf, len, recsize, &n);
 }
-EXPORT_SYMBOL(kfifo_from_user);
+EXPORT_SYMBOL(__kfifo_out_peek_r);
 
-unsigned int __kfifo_from_user_generic(struct kfifo *fifo,
-	const void __user *from, unsigned int len, unsigned int recsize)
+unsigned int __kfifo_out_r(struct __kfifo *fifo, void *buf,
+		unsigned int len, size_t recsize)
 {
-	return __kfifo_from_user_rec(fifo, from, len, recsize);
+	unsigned int n;
+
+	if (fifo->in == fifo->out)
+		return 0;
+
+	len = kfifo_out_copy_r(fifo, buf, len, recsize, &n);
+	fifo->out += n + recsize;
+	return len;
 }
-EXPORT_SYMBOL(__kfifo_from_user_generic);
+EXPORT_SYMBOL(__kfifo_out_r);
 
-unsigned int __kfifo_to_user_n(struct kfifo *fifo,
-	void __user *to, unsigned int len, unsigned int reclen,
-	unsigned int recsize)
+int __kfifo_from_user_r(struct __kfifo *fifo, const void __user *from,
+	unsigned long len, unsigned int *copied, size_t recsize)
 {
-	unsigned int ret, total;
+	unsigned long ret;
 
-	if (kfifo_len(fifo) < reclen + recsize)
-		return len;
+	len = __kfifo_max_r(len, recsize);
 
-	ret = __kfifo_to_user_data(fifo, to, reclen, recsize, &total);
+	if (len + recsize > kfifo_unused(fifo)) {
+		*copied = 0;
+		return 0;
+	}
 
-	if (likely(ret == 0))
-		__kfifo_add_out(fifo, reclen + recsize);
+	__kfifo_poke_n(fifo, len, recsize);
 
-	return total;
+	ret = kfifo_copy_from_user(fifo, from, len, fifo->in + recsize, copied);
+	if (unlikely(ret)) {
+		*copied = 0;
+		return -EFAULT;
+	}
+	fifo->in += len + recsize;
+	return 0;
 }
-EXPORT_SYMBOL(__kfifo_to_user_n);
-
-/**
- * kfifo_to_user - gets data from the FIFO and write it to user space
- * @fifo: the fifo to be used.
- * @to: where the data must be copied.
- * @len: the size of the destination buffer.
- * @lenout: pointer to output variable with copied data
- *
- * This function copies at most @len bytes from the FIFO into the
- * @to buffer and 0 or -EFAULT.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
- */
-int kfifo_to_user(struct kfifo *fifo,
-	void __user *to, unsigned int len, unsigned *lenout)
+EXPORT_SYMBOL(__kfifo_from_user_r);
+
+int __kfifo_to_user_r(struct __kfifo *fifo, void __user *to,
+	unsigned long len, unsigned int *copied, size_t recsize)
 {
-	int ret;
-	len = min(kfifo_len(fifo), len);
-	ret = __kfifo_to_user_data(fifo, to, len, 0, lenout);
-	__kfifo_add_out(fifo, *lenout);
-	return ret;
+	unsigned long ret;
+	unsigned int n;
+
+	if (fifo->in == fifo->out) {
+		*copied = 0;
+		return 0;
+	}
+
+	n = __kfifo_peek_n(fifo, recsize);
+	if (len > n)
+		len = n;
+
+	ret = kfifo_copy_to_user(fifo, to, len, fifo->out + recsize, copied);
+	if (unlikely(ret)) {
+		*copied = 0;
+		return -EFAULT;
+	}
+	fifo->out += n + recsize;
+	return 0;
 }
-EXPORT_SYMBOL(kfifo_to_user);
+EXPORT_SYMBOL(__kfifo_to_user_r);
 
-unsigned int __kfifo_to_user_generic(struct kfifo *fifo,
-	void __user *to, unsigned int len, unsigned int recsize,
-	unsigned int *total)
+unsigned int __kfifo_dma_in_prepare_r(struct __kfifo *fifo,
+	struct scatterlist *sgl, int nents, unsigned int len, size_t recsize)
 {
-	return __kfifo_to_user_rec(fifo, to, len, recsize, total);
+	if (!nents)
+		BUG();
+
+	len = __kfifo_max_r(len, recsize);
+
+	if (len + recsize > kfifo_unused(fifo))
+		return 0;
+
+	return setup_sgl(fifo, sgl, nents, len, fifo->in + recsize);
 }
-EXPORT_SYMBOL(__kfifo_to_user_generic);
+EXPORT_SYMBOL(__kfifo_dma_in_prepare_r);
 
-unsigned int __kfifo_peek_generic(struct kfifo *fifo, unsigned int recsize)
+void __kfifo_dma_in_finish_r(struct __kfifo *fifo,
+	unsigned int len, size_t recsize)
 {
-	if (recsize == 0)
-		return kfifo_avail(fifo);
-
-	return __kfifo_peek_n(fifo, recsize);
+	len = __kfifo_max_r(len, recsize);
+	__kfifo_poke_n(fifo, len, recsize);
+	fifo->in += len + recsize;
 }
-EXPORT_SYMBOL(__kfifo_peek_generic);
+EXPORT_SYMBOL(__kfifo_dma_in_finish_r);
 
-void __kfifo_skip_generic(struct kfifo *fifo, unsigned int recsize)
+unsigned int __kfifo_dma_out_prepare_r(struct __kfifo *fifo,
+	struct scatterlist *sgl, int nents, unsigned int len, size_t recsize)
 {
-	__kfifo_skip_rec(fifo, recsize);
+	if (!nents)
+		BUG();
+
+	len = __kfifo_max_r(len, recsize);
+
+	if (len + recsize > fifo->in - fifo->out)
+		return 0;
+
+	return setup_sgl(fifo, sgl, nents, len, fifo->out + recsize);
 }
-EXPORT_SYMBOL(__kfifo_skip_generic);
+EXPORT_SYMBOL(__kfifo_dma_out_prepare_r);
+
+void __kfifo_dma_out_finish_r(struct __kfifo *fifo, size_t recsize)
+{
+	unsigned int len;
 
+	len = __kfifo_peek_n(fifo, recsize);
+	fifo->out += len + recsize;
+}
+EXPORT_SYMBOL(__kfifo_dma_out_finish_r);
diff --git a/kernel/panic.c b/kernel/panic.c
index 3b16cd9..4c13b1a 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -24,6 +24,9 @@
 #include <linux/nmi.h>
 #include <linux/dmi.h>
 
+#define PANIC_TIMER_STEP 100
+#define PANIC_BLINK_SPD 18
+
 int panic_on_oops;
 static unsigned long tainted_mask;
 static int pause_on_oops;
@@ -36,36 +39,15 @@ ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
 
 EXPORT_SYMBOL(panic_notifier_list);
 
-/* Returns how long it waited in ms */
-long (*panic_blink)(long time);
-EXPORT_SYMBOL(panic_blink);
-
-static void panic_blink_one_second(void)
+static long no_blink(int state)
 {
-	static long i = 0, end;
-
-	if (panic_blink) {
-		end = i + MSEC_PER_SEC;
-
-		while (i < end) {
-			i += panic_blink(i);
-			mdelay(1);
-			i++;
-		}
-	} else {
-		/*
-		 * When running under a hypervisor a small mdelay may get
-		 * rounded up to the hypervisor timeslice. For example, with
-		 * a 1ms in 10ms hypervisor timeslice we might inflate a
-		 * mdelay(1) loop by 10x.
-		 *
-		 * If we have nothing to blink, spin on 1 second calls to
-		 * mdelay to avoid this.
-		 */
-		mdelay(MSEC_PER_SEC);
-	}
+	return 0;
 }
 
+/* Returns how long it waited in ms */
+long (*panic_blink)(int state);
+EXPORT_SYMBOL(panic_blink);
+
 /**
  *	panic - halt the system
  *	@fmt: The text string to print
@@ -78,7 +60,8 @@ NORET_TYPE void panic(const char * fmt, ...)
 {
 	static char buf[1024];
 	va_list args;
-	long i;
+	long i, i_next = 0;
+	int state = 0;
 
 	/*
 	 * It's possible to come here directly from a panic-assertion and
@@ -117,6 +100,9 @@ NORET_TYPE void panic(const char * fmt, ...)
 
 	bust_spinlocks(0);
 
+	if (!panic_blink)
+		panic_blink = no_blink;
+
 	if (panic_timeout > 0) {
 		/*
 		 * Delay timeout seconds before rebooting the machine.
@@ -124,9 +110,13 @@ NORET_TYPE void panic(const char * fmt, ...)
 		 */
 		printk(KERN_EMERG "Rebooting in %d seconds..", panic_timeout);
 
-		for (i = 0; i < panic_timeout; i++) {
+		for (i = 0; i < panic_timeout * 1000; i += PANIC_TIMER_STEP) {
 			touch_nmi_watchdog();
-			panic_blink_one_second();
+			if (i >= i_next) {
+				i += panic_blink(state ^= 1);
+				i_next = i + 3600 / PANIC_BLINK_SPD;
+			}
+			mdelay(PANIC_TIMER_STEP);
 		}
 		/*
 		 * This will not be a clean reboot, with everything
@@ -152,9 +142,13 @@ NORET_TYPE void panic(const char * fmt, ...)
 	}
 #endif
 	local_irq_enable();
-	while (1) {
+	for (i = 0; ; i += PANIC_TIMER_STEP) {
 		touch_softlockup_watchdog();
-		panic_blink_one_second();
+		if (i >= i_next) {
+			i += panic_blink(state ^= 1);
+			i_next = i + 3600 / PANIC_BLINK_SPD;
+		}
+		mdelay(PANIC_TIMER_STEP);
 	}
 }
 
@@ -344,7 +338,7 @@ static int init_oops_id(void)
 }
 late_initcall(init_oops_id);
 
-static void print_oops_end_marker(void)
+void print_oops_end_marker(void)
 {
 	init_oops_id();
 	printk(KERN_WARNING "---[ end trace %016llx ]---\n",
diff --git a/kernel/pid.c b/kernel/pid.c
index e9fd8c1..d55c6fb 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -122,6 +122,43 @@ static void free_pidmap(struct upid *upid)
 	atomic_inc(&map->nr_free);
 }
 
+/*
+ * If we started walking pids at 'base', is 'a' seen before 'b'?
+ */
+static int pid_before(int base, int a, int b)
+{
+	/*
+	 * This is the same as saying
+	 *
+	 * (a - base + MAXUINT) % MAXUINT < (b - base + MAXUINT) % MAXUINT
+	 * and that mapping orders 'a' and 'b' with respect to 'base'.
+	 */
+	return (unsigned)(a - base) < (unsigned)(b - base);
+}
+
+/*
+ * We might be racing with someone else trying to set pid_ns->last_pid.
+ * We want the winner to have the "later" value, because if the
+ * "earlier" value prevails, then a pid may get reused immediately.
+ *
+ * Since pids rollover, it is not sufficient to just pick the bigger
+ * value.  We have to consider where we started counting from.
+ *
+ * 'base' is the value of pid_ns->last_pid that we observed when
+ * we started looking for a pid.
+ *
+ * 'pid' is the pid that we eventually found.
+ */
+static void set_last_pid(struct pid_namespace *pid_ns, int base, int pid)
+{
+	int prev;
+	int last_write = base;
+	do {
+		prev = last_write;
+		last_write = cmpxchg(&pid_ns->last_pid, prev, pid);
+	} while ((prev != last_write) && (pid_before(base, last_write, pid)));
+}
+
 static int alloc_pidmap(struct pid_namespace *pid_ns)
 {
 	int i, offset, max_scan, pid, last = pid_ns->last_pid;
@@ -132,7 +169,12 @@ static int alloc_pidmap(struct pid_namespace *pid_ns)
 		pid = RESERVED_PIDS;
 	offset = pid & BITS_PER_PAGE_MASK;
 	map = &pid_ns->pidmap[pid/BITS_PER_PAGE];
-	max_scan = (pid_max + BITS_PER_PAGE - 1)/BITS_PER_PAGE - !offset;
+	/*
+	 * If last_pid points into the middle of the map->page we
+	 * want to scan this bitmap block twice, the second time
+	 * we start with offset == 0 (or RESERVED_PIDS).
+	 */
+	max_scan = DIV_ROUND_UP(pid_max, BITS_PER_PAGE) - !offset;
 	for (i = 0; i <= max_scan; ++i) {
 		if (unlikely(!map->page)) {
 			void *page = kzalloc(PAGE_SIZE, GFP_KERNEL);
@@ -154,20 +196,12 @@ static int alloc_pidmap(struct pid_namespace *pid_ns)
 			do {
 				if (!test_and_set_bit(offset, map->page)) {
 					atomic_dec(&map->nr_free);
-					pid_ns->last_pid = pid;
+					set_last_pid(pid_ns, last, pid);
 					return pid;
 				}
 				offset = find_next_offset(map, offset);
 				pid = mk_pid(pid_ns, map, offset);
-			/*
-			 * find_next_offset() found a bit, the pid from it
-			 * is in-bounds, and if we fell back to the last
-			 * bitmap block and the final block was the same
-			 * as the starting point, pid is before last_pid.
-			 */
-			} while (offset < BITS_PER_PAGE && pid < pid_max &&
-					(i != max_scan || pid < last ||
-					    !((last+1) & BITS_PER_PAGE_MASK)));
+			} while (offset < BITS_PER_PAGE && pid < pid_max);
 		}
 		if (map < &pid_ns->pidmap[(pid_max-1)/BITS_PER_PAGE]) {
 			++map;
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 74a3d69..f34d798 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -324,26 +324,32 @@ int ptrace_detach(struct task_struct *child, unsigned int data)
 }
 
 /*
- * Detach all tasks we were using ptrace on.
+ * Detach all tasks we were using ptrace on. Called with tasklist held
+ * for writing, and returns with it held too. But note it can release
+ * and reacquire the lock.
  */
 void exit_ptrace(struct task_struct *tracer)
 {
 	struct task_struct *p, *n;
 	LIST_HEAD(ptrace_dead);
 
-	write_lock_irq(&tasklist_lock);
+	if (likely(list_empty(&tracer->ptraced)))
+		return;
+
 	list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) {
 		if (__ptrace_detach(tracer, p))
 			list_add(&p->ptrace_entry, &ptrace_dead);
 	}
-	write_unlock_irq(&tasklist_lock);
 
+	write_unlock_irq(&tasklist_lock);
 	BUG_ON(!list_empty(&tracer->ptraced));
 
 	list_for_each_entry_safe(p, n, &ptrace_dead, ptrace_entry) {
 		list_del_init(&p->ptrace_entry);
 		release_task(p);
 	}
+
+	write_lock_irq(&tasklist_lock);
 }
 
 int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len)
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index e14c839..e960d82 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -690,6 +690,7 @@ static void timekeeping_adjust(s64 offset)
 static cycle_t logarithmic_accumulation(cycle_t offset, int shift)
 {
 	u64 nsecps = (u64)NSEC_PER_SEC << timekeeper.shift;
+	u64 raw_nsecs;
 
 	/* If the offset is smaller then a shifted interval, do nothing */
 	if (offset < timekeeper.cycle_interval<<shift)
@@ -706,12 +707,14 @@ static cycle_t logarithmic_accumulation(cycle_t offset, int shift)
 		second_overflow();
 	}
 
-	/* Accumulate into raw time */
-	raw_time.tv_nsec += timekeeper.raw_interval << shift;;
-	while (raw_time.tv_nsec >= NSEC_PER_SEC) {
-		raw_time.tv_nsec -= NSEC_PER_SEC;
+	/* Accumulate raw time */
+	raw_nsecs = timekeeper.raw_interval << shift;
+	raw_nsecs += raw_time.tv_nsec;
+	while (raw_nsecs >= NSEC_PER_SEC) {
+		raw_nsecs -= NSEC_PER_SEC;
 		raw_time.tv_sec++;
 	}
+	raw_time.tv_nsec = raw_nsecs;
 
 	/* Accumulate error between NTP and clock interval */
 	timekeeper.ntp_error += tick_length << shift;
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 82499a5..959f8d6 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -710,6 +710,9 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
 	if (rq->cmd_flags & REQ_DISCARD)
 		rw |= REQ_DISCARD;
 
+	if (rq->cmd_flags & REQ_SECURE)
+		rw |= REQ_SECURE;
+
 	if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
 		what |= BLK_TC_ACT(BLK_TC_PC);
 		__blk_add_trace(bt, 0, blk_rq_bytes(rq), rw,
@@ -1816,6 +1819,8 @@ void blk_fill_rwbs(char *rwbs, u32 rw, int bytes)
 		rwbs[i++] = 'S';
 	if (rw & REQ_META)
 		rwbs[i++] = 'M';
+	if (rw & REQ_SECURE)
+		rwbs[i++] = 'E';
 
 	rwbs[i] = '\0';
 }
@@ -1828,6 +1833,9 @@ void blk_fill_rwbs_rq(char *rwbs, struct request *rq)
 	if (rq->cmd_flags & REQ_DISCARD)
 		rw |= REQ_DISCARD;
 
+	if (rq->cmd_flags & REQ_SECURE)
+		rw |= REQ_SECURE;
+
 	bytes = blk_rq_bytes(rq);
 
 	blk_fill_rwbs(rwbs, rw, bytes);