unified (weak) sys_pipe implementation

This replaces the duplicated arch-specific versions of "sys_pipe()" with
one unified implementation.  This removes almost 250 lines of duplicated
code.

It's marked __weak, so that *if* an architecture wants to override the
default implementation it can do so by simply having its own replacement
version, since many architectures use alternate calling conventions for
the 'pipe()' system call for legacy reasons (ie traditional UNIX
implementations often return the two file descriptors in registers)

I still haven't changed the cris version even though Linus says the BKL
isn't needed.  The arch maintainer can easily do it if there are really
no obstacles.

Signed-off-by: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

18 files changed, 18 insertions, 265 deletions

diff --git a/arch/arm/kernel/sys_arm.c b/arch/arm/kernel/sys_arm.c
index 9bd1870..0128687 100644
--- a/arch/arm/kernel/sys_arm.c
+++ b/arch/arm/kernel/sys_arm.c
@@ -34,23 +34,6 @@ extern unsigned long do_mremap(unsigned long addr, unsigned long old_len,
 			       unsigned long new_len, unsigned long flags,
 			       unsigned long new_addr);
 
-/*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way unix traditionally does this, though.
- */
-asmlinkage int sys_pipe(unsigned long __user *fildes)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe(fd);
-	if (!error) {
-		if (copy_to_user(fildes, fd, 2*sizeof(int)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 /* common code for old and new mmaps */
 inline long do_mmap2(
 	unsigned long addr, unsigned long len,
diff --git a/arch/avr32/kernel/sys_avr32.c b/arch/avr32/kernel/sys_avr32.c
index 8deb600..8e8911e 100644
--- a/arch/avr32/kernel/sys_avr32.c
+++ b/arch/avr32/kernel/sys_avr32.c
@@ -14,19 +14,6 @@
 #include <asm/mman.h>
 #include <asm/uaccess.h>
 
-asmlinkage int sys_pipe(unsigned long __user *filedes)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe(fd);
-	if (!error) {
-		if (copy_to_user(filedes, fd, sizeof(fd)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
 			  unsigned long prot, unsigned long flags,
 			  unsigned long fd, off_t offset)
diff --git a/arch/blackfin/kernel/sys_bfin.c b/arch/blackfin/kernel/sys_bfin.c
index efb7b25..fce49d7 100644
--- a/arch/blackfin/kernel/sys_bfin.c
+++ b/arch/blackfin/kernel/sys_bfin.c
@@ -45,23 +45,6 @@
 #include <asm/cacheflush.h>
 #include <asm/dma.h>
 
-/*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way unix traditionally does this, though.
- */
-asmlinkage int sys_pipe(unsigned long __user *fildes)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe(fd);
-	if (!error) {
-		if (copy_to_user(fildes, fd, 2 * sizeof(int)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 /* common code for old and new mmaps */
 static inline long
 do_mmap2(unsigned long addr, unsigned long len,
diff --git a/arch/frv/kernel/sys_frv.c b/arch/frv/kernel/sys_frv.c
index 04c6b16..49b2cf2 100644
--- a/arch/frv/kernel/sys_frv.c
+++ b/arch/frv/kernel/sys_frv.c
@@ -28,23 +28,6 @@
 #include <asm/setup.h>
 #include <asm/uaccess.h>
 
-/*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way unix traditionally does this, though.
- */
-asmlinkage long sys_pipe(unsigned long __user * fildes)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe(fd);
-	if (!error) {
-		if (copy_to_user(fildes, fd, 2*sizeof(int)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
 			  unsigned long prot, unsigned long flags,
 			  unsigned long fd, unsigned long pgoff)
diff --git a/arch/h8300/kernel/sys_h8300.c b/arch/h8300/kernel/sys_h8300.c
index 00608be6..2745656 100644
--- a/arch/h8300/kernel/sys_h8300.c
+++ b/arch/h8300/kernel/sys_h8300.c
@@ -27,23 +27,6 @@
 #include <asm/traps.h>
 #include <asm/unistd.h>
 
-/*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way unix traditionally does this, though.
- */
-asmlinkage int sys_pipe(unsigned long * fildes)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe(fd);
-	if (!error) {
-		if (copy_to_user(fildes, fd, 2*sizeof(int)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 /* common code for old and new mmaps */
 static inline long do_mmap2(
 	unsigned long addr, unsigned long len,
diff --git a/arch/m68k/kernel/sys_m68k.c b/arch/m68k/kernel/sys_m68k.c
index e892f17..7f54efa 100644
--- a/arch/m68k/kernel/sys_m68k.c
+++ b/arch/m68k/kernel/sys_m68k.c
@@ -30,23 +30,6 @@
 #include <asm/page.h>
 #include <asm/unistd.h>
 
-/*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way unix traditionally does this, though.
- */
-asmlinkage int sys_pipe(unsigned long __user * fildes)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe(fd);
-	if (!error) {
-		if (copy_to_user(fildes, fd, 2*sizeof(int)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 /* common code for old and new mmaps */
 static inline long do_mmap2(
 	unsigned long addr, unsigned long len,
diff --git a/arch/m68knommu/kernel/sys_m68k.c b/arch/m68knommu/kernel/sys_m68k.c
index 65f7a95..7002816 100644
--- a/arch/m68knommu/kernel/sys_m68k.c
+++ b/arch/m68knommu/kernel/sys_m68k.c
@@ -28,23 +28,6 @@
 #include <asm/cacheflush.h>
 #include <asm/unistd.h>
 
-/*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way unix traditionally does this, though.
- */
-asmlinkage int sys_pipe(unsigned long * fildes)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe(fd);
-	if (!error) {
-		if (copy_to_user(fildes, fd, 2*sizeof(int)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 /* common code for old and new mmaps */
 static inline long do_mmap2(
 	unsigned long addr, unsigned long len,
diff --git a/arch/mn10300/kernel/sys_mn10300.c b/arch/mn10300/kernel/sys_mn10300.c
index 5f17a1e..bca5a84 100644
--- a/arch/mn10300/kernel/sys_mn10300.c
+++ b/arch/mn10300/kernel/sys_mn10300.c
@@ -29,23 +29,6 @@
 #define MIN_MAP_ADDR	PAGE_SIZE	/* minimum fixed mmap address */
 
 /*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way Unix traditionally does this, though.
- */
-asmlinkage long sys_pipe(unsigned long __user *fildes)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe(fd);
-	if (!error) {
-		if (copy_to_user(fildes, fd, 2 * sizeof(int)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
-/*
  * memory mapping syscall
  */
 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index 4f58921..71b3195 100644
--- a/arch/parisc/kernel/sys_parisc.c
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -33,19 +33,6 @@
 #include <linux/utsname.h>
 #include <linux/personality.h>
 
-int sys_pipe(int __user *fildes)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe(fd);
-	if (!error) {
-		if (copy_to_user(fildes, fd, 2*sizeof(int)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 static unsigned long get_unshared_area(unsigned long addr, unsigned long len)
 {
 	struct vm_area_struct *vma;
diff --git a/arch/powerpc/kernel/syscalls.c b/arch/powerpc/kernel/syscalls.c
index e722a4e..4fe69ca 100644
--- a/arch/powerpc/kernel/syscalls.c
+++ b/arch/powerpc/kernel/syscalls.c
@@ -136,23 +136,6 @@ int sys_ipc(uint call, int first, unsigned long second, long third,
 	return ret;
 }
 
-/*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way unix traditionally does this, though.
- */
-int sys_pipe(int __user *fildes)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe(fd);
-	if (!error) {
-		if (copy_to_user(fildes, fd, 2*sizeof(int)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 static inline unsigned long do_mmap2(unsigned long addr, size_t len,
 			unsigned long prot, unsigned long flags,
 			unsigned long fd, unsigned long off, int shift)
diff --git a/arch/s390/kernel/sys_s390.c b/arch/s390/kernel/sys_s390.c
index 988d0d6..5fdb799 100644
--- a/arch/s390/kernel/sys_s390.c
+++ b/arch/s390/kernel/sys_s390.c
@@ -32,23 +32,6 @@
 #include <asm/uaccess.h>
 #include "entry.h"
 
-/*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way Unix traditionally does this, though.
- */
-asmlinkage long sys_pipe(unsigned long __user *fildes)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe(fd);
-	if (!error) {
-		if (copy_to_user(fildes, fd, 2*sizeof(int)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 /* common code for old and new mmaps */
 static inline long do_mmap2(
 	unsigned long addr, unsigned long len,
diff --git a/arch/sh/kernel/sys_sh64.c b/arch/sh/kernel/sys_sh64.c
index 578004d..91fb844 100644
--- a/arch/sh/kernel/sys_sh64.c
+++ b/arch/sh/kernel/sys_sh64.c
@@ -31,23 +31,6 @@
 #include <asm/unistd.h>
 
 /*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way Unix traditionally does this, though.
- */
-asmlinkage int sys_pipe(unsigned long * fildes)
-{
-        int fd[2];
-        int error;
-
-        error = do_pipe(fd);
-        if (!error) {
-                if (copy_to_user(fildes, fd, 2*sizeof(int)))
-                        error = -EFAULT;
-        }
-        return error;
-}
-
-/*
  * Do a system call from kernel instead of calling sys_execve so we
  * end up with proper pt_regs.
  */
diff --git a/arch/um/kernel/syscall.c b/arch/um/kernel/syscall.c
index 9cffc62..128ee85 100644
--- a/arch/um/kernel/syscall.c
+++ b/arch/um/kernel/syscall.c
@@ -73,23 +73,6 @@ long old_mmap(unsigned long addr, unsigned long len,
  out:
 	return err;
 }
-/*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way unix traditionally does this, though.
- */
-long sys_pipe(unsigned long __user * fildes)
-{
-	int fd[2];
-	long error;
-
-	error = do_pipe(fd);
-	if (!error) {
-		if (copy_to_user(fildes, fd, sizeof(fd)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 
 long sys_uname(struct old_utsname __user * name)
 {
diff --git a/arch/v850/kernel/syscalls.c b/arch/v850/kernel/syscalls.c
index 003db9c..1a83daf 100644
--- a/arch/v850/kernel/syscalls.c
+++ b/arch/v850/kernel/syscalls.c
@@ -132,23 +132,6 @@ sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
 	return ret;
 }
 
-/*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way unix traditionally does this, though.
- */
-int sys_pipe (int *fildes)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe (fd);
-	if (!error) {
-		if (copy_to_user (fildes, fd, 2*sizeof (int)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 static inline unsigned long
 do_mmap2 (unsigned long addr, size_t len,
 	 unsigned long prot, unsigned long flags,
diff --git a/arch/x86/kernel/sys_i386_32.c b/arch/x86/kernel/sys_i386_32.c
index a86d26f..d2ab52c 100644
--- a/arch/x86/kernel/sys_i386_32.c
+++ b/arch/x86/kernel/sys_i386_32.c
@@ -22,23 +22,6 @@
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
 
-/*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way Unix traditionally does this, though.
- */
-asmlinkage int sys_pipe(unsigned long __user * fildes)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe(fd);
-	if (!error) {
-		if (copy_to_user(fildes, fd, 2*sizeof(int)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
 			  unsigned long prot, unsigned long flags,
 			  unsigned long fd, unsigned long pgoff)
diff --git a/arch/x86/kernel/sys_x86_64.c b/arch/x86/kernel/sys_x86_64.c
index bd802a5..3b360ef 100644
--- a/arch/x86/kernel/sys_x86_64.c
+++ b/arch/x86/kernel/sys_x86_64.c
@@ -17,23 +17,6 @@
 #include <asm/uaccess.h>
 #include <asm/ia32.h>
 
-/*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way Unix traditionally does this, though.
- */
-asmlinkage long sys_pipe(int __user *fildes)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe(fd);
-	if (!error) {
-		if (copy_to_user(fildes, fd, 2*sizeof(int)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 asmlinkage long sys_mmap(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags,
 	unsigned long fd, unsigned long off)
 {
diff --git a/fs/pipe.c b/fs/pipe.c
index f73492b..3499f9f 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -1076,6 +1076,23 @@ int do_pipe(int *fd)
 }
 
 /*
+ * sys_pipe() is the normal C calling standard for creating
+ * a pipe. It's not the way Unix traditionally does this, though.
+ */
+asmlinkage long __weak sys_pipe(int __user *fildes)
+{
+	int fd[2];
+	int error;
+
+	error = do_pipe(fd);
+	if (!error) {
+		if (copy_to_user(fildes, fd, sizeof(fd)))
+			error = -EFAULT;
+	}
+	return error;
+}
+
+/*
  * pipefs should _never_ be mounted by userland - too much of security hassle,
  * no real gain from having the whole whorehouse mounted. So we don't need
  * any operations on the root directory. However, we need a non-trivial
diff --git a/include/asm-powerpc/syscalls.h b/include/asm-powerpc/syscalls.h
index b3ca41f..2b8a458 100644
--- a/include/asm-powerpc/syscalls.h
+++ b/include/asm-powerpc/syscalls.h
@@ -30,7 +30,7 @@ asmlinkage int sys_fork(unsigned long p1, unsigned long p2,
 asmlinkage int sys_vfork(unsigned long p1, unsigned long p2,
 		unsigned long p3, unsigned long p4, unsigned long p5,
 		unsigned long p6, struct pt_regs *regs);
-asmlinkage int sys_pipe(int __user *fildes);
+asmlinkage long sys_pipe(int __user *fildes);
 asmlinkage long sys_rt_sigaction(int sig,
 		const struct sigaction __user *act,
 		struct sigaction __user *oact, size_t sigsetsize);