Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system

Pull "Disintegrate and delete asm/system.h" from David Howells:
 "Here are a bunch of patches to disintegrate asm/system.h into a set of
  separate bits to relieve the problem of circular inclusion
  dependencies.

  I've built all the working defconfigs from all the arches that I can
  and made sure that they don't break.

  The reason for these patches is that I recently encountered a circular
  dependency problem that came about when I produced some patches to
  optimise get_order() by rewriting it to use ilog2().

  This uses bitops - and on the SH arch asm/bitops.h drags in
  asm-generic/get_order.h by a circuituous route involving asm/system.h.

  The main difficulty seems to be asm/system.h.  It holds a number of
  low level bits with no/few dependencies that are commonly used (eg.
  memory barriers) and a number of bits with more dependencies that
  aren't used in many places (eg.  switch_to()).

  These patches break asm/system.h up into the following core pieces:

    (1) asm/barrier.h

        Move memory barriers here.  This already done for MIPS and Alpha.

    (2) asm/switch_to.h

        Move switch_to() and related stuff here.

    (3) asm/exec.h

        Move arch_align_stack() here.  Other process execution related bits
        could perhaps go here from asm/processor.h.

    (4) asm/cmpxchg.h

        Move xchg() and cmpxchg() here as they're full word atomic ops and
        frequently used by atomic_xchg() and atomic_cmpxchg().

    (5) asm/bug.h

        Move die() and related bits.

    (6) asm/auxvec.h

        Move AT_VECTOR_SIZE_ARCH here.

  Other arch headers are created as needed on a per-arch basis."

Fixed up some conflicts from other header file cleanups and moving code
around that has happened in the meantime, so David's testing is somewhat
weakened by that.  We'll find out anything that got broken and fix it..

* tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits)
  Delete all instances of asm/system.h
  Remove all #inclusions of asm/system.h
  Add #includes needed to permit the removal of asm/system.h
  Move all declarations of free_initmem() to linux/mm.h
  Disintegrate asm/system.h for OpenRISC
  Split arch_align_stack() out from asm-generic/system.h
  Split the switch_to() wrapper out of asm-generic/system.h
  Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h
  Create asm-generic/barrier.h
  Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h
  Disintegrate asm/system.h for Xtensa
  Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt]
  Disintegrate asm/system.h for Tile
  Disintegrate asm/system.h for Sparc
  Disintegrate asm/system.h for SH
  Disintegrate asm/system.h for Score
  Disintegrate asm/system.h for S390
  Disintegrate asm/system.h for PowerPC
  Disintegrate asm/system.h for PA-RISC
  Disintegrate asm/system.h for MN10300
  ...

10 files changed, 209 insertions, 164 deletions

diff --git a/arch/unicore32/include/asm/Kbuild b/arch/unicore32/include/asm/Kbuild
index ca113d6..34b789b 100644
--- a/arch/unicore32/include/asm/Kbuild
+++ b/arch/unicore32/include/asm/Kbuild
@@ -3,7 +3,6 @@ include include/asm-generic/Kbuild.asm
 generic-y += atomic.h
 generic-y += auxvec.h
 generic-y += bitsperlong.h
-generic-y += bug.h
 generic-y += bugs.h
 generic-y += cputime.h
 generic-y += current.h
diff --git a/arch/unicore32/include/asm/barrier.h b/arch/unicore32/include/asm/barrier.h
new file mode 100644
index 0000000..a6620e5
--- /dev/null
+++ b/arch/unicore32/include/asm/barrier.h
@@ -0,0 +1,28 @@
+/*
+ * Memory barrier implementations for PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2012 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __UNICORE_BARRIER_H__
+#define __UNICORE_BARRIER_H__
+
+#define isb() __asm__ __volatile__ ("" : : : "memory")
+#define dsb() __asm__ __volatile__ ("" : : : "memory")
+#define dmb() __asm__ __volatile__ ("" : : : "memory")
+
+#define mb()				barrier()
+#define rmb()				barrier()
+#define wmb()				barrier()
+#define smp_mb()			barrier()
+#define smp_rmb()			barrier()
+#define smp_wmb()			barrier()
+#define read_barrier_depends()		do { } while (0)
+#define smp_read_barrier_depends()	do { } while (0)
+
+#define set_mb(var, value)		do { var = value; smp_mb(); } while (0)
+
+#endif /* __UNICORE_BARRIER_H__ */
diff --git a/arch/unicore32/include/asm/bug.h b/arch/unicore32/include/asm/bug.h
new file mode 100644
index 0000000..b1ff8ca
--- /dev/null
+++ b/arch/unicore32/include/asm/bug.h
@@ -0,0 +1,27 @@
+/*
+ * Bug handling for PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2012 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __UNICORE_BUG_H__
+#define __UNICORE_BUG_H__
+
+#include <asm-generic/bug.h>
+
+struct pt_regs;
+struct siginfo;
+
+extern void die(const char *msg, struct pt_regs *regs, int err);
+extern void uc32_notify_die(const char *str, struct pt_regs *regs,
+		struct siginfo *info, unsigned long err, unsigned long trap);
+
+extern asmlinkage void __backtrace(void);
+extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
+
+extern void __show_regs(struct pt_regs *);
+
+#endif /* __UNICORE_BUG_H__ */
diff --git a/arch/unicore32/include/asm/cmpxchg.h b/arch/unicore32/include/asm/cmpxchg.h
new file mode 100644
index 0000000..df4d5ac
--- /dev/null
+++ b/arch/unicore32/include/asm/cmpxchg.h
@@ -0,0 +1,61 @@
+/*
+ * Atomics xchg/cmpxchg for PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2012 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __UNICORE_CMPXCHG_H__
+#define __UNICORE_CMPXCHG_H__
+
+/*
+ * Generate a link failure on undefined symbol if the pointer points to a value
+ * of unsupported size.
+ */
+extern void __xchg_bad_pointer(void);
+
+static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
+		int size)
+{
+	unsigned long ret;
+
+	switch (size) {
+	case 1:
+		asm volatile("swapb	%0, %1, [%2]"
+			: "=&r" (ret)
+			: "r" (x), "r" (ptr)
+			: "memory", "cc");
+		break;
+	case 4:
+		asm volatile("swapw	%0, %1, [%2]"
+			: "=&r" (ret)
+			: "r" (x), "r" (ptr)
+			: "memory", "cc");
+		break;
+	default:
+		ret = __xchg_bad_pointer();
+	}
+
+	return ret;
+}
+
+#define xchg(ptr, x) \
+	((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
+
+#include <asm-generic/cmpxchg-local.h>
+
+/*
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
+ */
+#define cmpxchg_local(ptr, o, n)					\
+		((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr),	\
+		(unsigned long)(o), (unsigned long)(n), sizeof(*(ptr))))
+#define cmpxchg64_local(ptr, o, n)					\
+		__cmpxchg64_local_generic((ptr), (o), (n))
+
+#include <asm-generic/cmpxchg.h>
+
+#endif /* __UNICORE_CMPXCHG_H__ */
diff --git a/arch/unicore32/include/asm/exec.h b/arch/unicore32/include/asm/exec.h
new file mode 100644
index 0000000..06d1f0f
--- /dev/null
+++ b/arch/unicore32/include/asm/exec.h
@@ -0,0 +1,15 @@
+/*
+ * Process execution bits for PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2012 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __UNICORE_EXEC_H__
+#define __UNICORE_EXEC_H__
+
+#define arch_align_stack(x)		(x)
+
+#endif /* __UNICORE_EXEC_H__ */
diff --git a/arch/unicore32/include/asm/hwdef-copro.h b/arch/unicore32/include/asm/hwdef-copro.h
new file mode 100644
index 0000000..a3292f0
--- /dev/null
+++ b/arch/unicore32/include/asm/hwdef-copro.h
@@ -0,0 +1,48 @@
+/*
+ * Co-processor register definitions for PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2012 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __UNICORE_HWDEF_COPRO_H__
+#define __UNICORE_HWDEF_COPRO_H__
+
+/*
+ * Control Register bits (CP#0 CR1)
+ */
+#define CR_M	(1 << 0)	/* MMU enable				*/
+#define CR_A	(1 << 1)	/* Alignment abort enable		*/
+#define CR_D	(1 << 2)	/* Dcache enable			*/
+#define CR_I	(1 << 3)	/* Icache enable			*/
+#define CR_B	(1 << 4)	/* Dcache write mechanism: write back	*/
+#define CR_T	(1 << 5)	/* Burst enable				*/
+#define CR_V	(1 << 13)	/* Vectors relocated to 0xffff0000	*/
+
+#ifndef __ASSEMBLY__
+
+#define vectors_high()		(cr_alignment & CR_V)
+
+extern unsigned long cr_no_alignment;	/* defined in entry.S */
+extern unsigned long cr_alignment;	/* defined in entry.S */
+
+static inline unsigned int get_cr(void)
+{
+	unsigned int val;
+	asm("movc %0, p0.c1, #0" : "=r" (val) : : "cc");
+	return val;
+}
+
+static inline void set_cr(unsigned int val)
+{
+	asm volatile("movc p0.c1, %0, #0" : : "r" (val) : "cc");
+	isb();
+}
+
+extern void adjust_cr(unsigned long mask, unsigned long set);
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __UNICORE_HWDEF_COPRO_H__ */
diff --git a/arch/unicore32/include/asm/io.h b/arch/unicore32/include/asm/io.h
index adddf6d..39decb6 100644
--- a/arch/unicore32/include/asm/io.h
+++ b/arch/unicore32/include/asm/io.h
@@ -16,7 +16,6 @@
 
 #include <asm/byteorder.h>
 #include <asm/memory.h>
-#include <asm/system.h>
 
 #define PCI_IOBASE	PKUNITY_PCILIO_BASE
 #include <asm-generic/io.h>
diff --git a/arch/unicore32/include/asm/switch_to.h b/arch/unicore32/include/asm/switch_to.h
new file mode 100644
index 0000000..39572d2
--- /dev/null
+++ b/arch/unicore32/include/asm/switch_to.h
@@ -0,0 +1,30 @@
+/*
+ * Task switching for PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2012 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __UNICORE_SWITCH_TO_H__
+#define __UNICORE_SWITCH_TO_H__
+
+struct task_struct;
+struct thread_info;
+
+/*
+ * switch_to(prev, next) should switch from task `prev' to `next'
+ * `prev' will never be the same as `next'.  schedule() itself
+ * contains the memory barrier to tell GCC not to cache `current'.
+ */
+extern struct task_struct *__switch_to(struct task_struct *,
+		struct thread_info *, struct thread_info *);
+
+#define switch_to(prev, next, last)					\
+	do {								\
+		last = __switch_to(prev, task_thread_info(prev),	\
+					task_thread_info(next));	\
+	} while (0)
+
+#endif /* __UNICORE_SWITCH_TO_H__ */
diff --git a/arch/unicore32/include/asm/system.h b/arch/unicore32/include/asm/system.h
deleted file mode 100644
index 246b71c..0000000
--- a/arch/unicore32/include/asm/system.h
+++ /dev/null
@@ -1,161 +0,0 @@
-/*
- * linux/arch/unicore32/include/asm/system.h
- *
- * Code specific to PKUnity SoC and UniCore ISA
- *
- * Copyright (C) 2001-2010 GUAN Xue-tao
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#ifndef __UNICORE_SYSTEM_H__
-#define __UNICORE_SYSTEM_H__
-
-#ifdef __KERNEL__
-
-/*
- * CR1 bits (CP#0 CR1)
- */
-#define CR_M	(1 << 0)	/* MMU enable				*/
-#define CR_A	(1 << 1)	/* Alignment abort enable		*/
-#define CR_D	(1 << 2)	/* Dcache enable			*/
-#define CR_I	(1 << 3)	/* Icache enable			*/
-#define CR_B	(1 << 4)	/* Dcache write mechanism: write back	*/
-#define CR_T	(1 << 5)	/* Burst enable				*/
-#define CR_V	(1 << 13)	/* Vectors relocated to 0xffff0000	*/
-
-#ifndef __ASSEMBLY__
-
-#include <linux/linkage.h>
-#include <linux/irqflags.h>
-
-struct thread_info;
-struct task_struct;
-
-struct pt_regs;
-
-void die(const char *msg, struct pt_regs *regs, int err);
-
-struct siginfo;
-void uc32_notify_die(const char *str, struct pt_regs *regs,
-		struct siginfo *info, unsigned long err, unsigned long trap);
-
-void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
-				       struct pt_regs *),
-		     int sig, int code, const char *name);
-
-#define xchg(ptr, x) \
-	((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
-
-extern asmlinkage void __backtrace(void);
-extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
-
-struct mm_struct;
-extern void show_pte(struct mm_struct *mm, unsigned long addr);
-extern void __show_regs(struct pt_regs *);
-
-extern int cpu_architecture(void);
-extern void cpu_init(void);
-
-#define vectors_high()	(cr_alignment & CR_V)
-
-#define isb() __asm__ __volatile__ ("" : : : "memory")
-#define dsb() __asm__ __volatile__ ("" : : : "memory")
-#define dmb() __asm__ __volatile__ ("" : : : "memory")
-
-#define mb()		barrier()
-#define rmb()		barrier()
-#define wmb()		barrier()
-#define smp_mb()	barrier()
-#define smp_rmb()	barrier()
-#define smp_wmb()	barrier()
-#define read_barrier_depends()		do { } while (0)
-#define smp_read_barrier_depends()	do { } while (0)
-
-#define set_mb(var, value)	do { var = value; smp_mb(); } while (0)
-#define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
-
-extern unsigned long cr_no_alignment;	/* defined in entry-unicore.S */
-extern unsigned long cr_alignment;	/* defined in entry-unicore.S */
-
-static inline unsigned int get_cr(void)
-{
-	unsigned int val;
-	asm("movc %0, p0.c1, #0" : "=r" (val) : : "cc");
-	return val;
-}
-
-static inline void set_cr(unsigned int val)
-{
-	asm volatile("movc p0.c1, %0, #0	@set CR"
-	  : : "r" (val) : "cc");
-	isb();
-}
-
-extern void adjust_cr(unsigned long mask, unsigned long set);
-
-/*
- * switch_to(prev, next) should switch from task `prev' to `next'
- * `prev' will never be the same as `next'.  schedule() itself
- * contains the memory barrier to tell GCC not to cache `current'.
- */
-extern struct task_struct *__switch_to(struct task_struct *,
-		struct thread_info *, struct thread_info *);
-extern void panic(const char *fmt, ...);
-
-#define switch_to(prev, next, last)					\
-do {									\
-	last = __switch_to(prev,					\
-		task_thread_info(prev), task_thread_info(next));	\
-} while (0)
-
-static inline unsigned long
-__xchg(unsigned long x, volatile void *ptr, int size)
-{
-	unsigned long ret;
-
-	switch (size) {
-	case 1:
-		asm volatile("@	__xchg1\n"
-		"	swapb	%0, %1, [%2]"
-			: "=&r" (ret)
-			: "r" (x), "r" (ptr)
-			: "memory", "cc");
-		break;
-	case 4:
-		asm volatile("@	__xchg4\n"
-		"	swapw	%0, %1, [%2]"
-			: "=&r" (ret)
-			: "r" (x), "r" (ptr)
-			: "memory", "cc");
-		break;
-	default:
-		panic("xchg: bad data size: ptr 0x%p, size %d\n",
-			ptr, size);
-	}
-
-	return ret;
-}
-
-#include <asm-generic/cmpxchg-local.h>
-
-/*
- * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
- * them available.
- */
-#define cmpxchg_local(ptr, o, n)					\
-		((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr),	\
-		(unsigned long)(o), (unsigned long)(n), sizeof(*(ptr))))
-#define cmpxchg64_local(ptr, o, n)					\
-		__cmpxchg64_local_generic((ptr), (o), (n))
-
-#include <asm-generic/cmpxchg.h>
-
-#endif /* __ASSEMBLY__ */
-
-#define arch_align_stack(x) (x)
-
-#endif /* __KERNEL__ */
-
-#endif
diff --git a/arch/unicore32/include/asm/uaccess.h b/arch/unicore32/include/asm/uaccess.h
index 2acda50..897e11ad 100644
--- a/arch/unicore32/include/asm/uaccess.h
+++ b/arch/unicore32/include/asm/uaccess.h
@@ -16,7 +16,6 @@
 #include <linux/errno.h>
 
 #include <asm/memory.h>
-#include <asm/system.h>
 
 #define __copy_from_user	__copy_from_user
 #define __copy_to_user		__copy_to_user