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, 66 insertions, 57 deletions

diff --git a/arch/cris/include/arch-v10/arch/elf.h b/arch/cris/include/arch-v10/arch/elf.h
index 1c38ee728b1..1eb638aeddb 100644
--- a/arch/cris/include/arch-v10/arch/elf.h
+++ b/arch/cris/include/arch-v10/arch/elf.h
@@ -1,6 +1,8 @@
 #ifndef __ASMCRIS_ARCH_ELF_H
 #define __ASMCRIS_ARCH_ELF_H
 
+#include <arch/system.h>
+
 #define ELF_MACH EF_CRIS_VARIANT_ANY_V0_V10
 
 /*
diff --git a/arch/cris/include/arch-v32/arch/elf.h b/arch/cris/include/arch-v32/arch/elf.h
index 1324e505a4d..c46d5829116 100644
--- a/arch/cris/include/arch-v32/arch/elf.h
+++ b/arch/cris/include/arch-v32/arch/elf.h
@@ -1,6 +1,8 @@
 #ifndef _ASM_CRIS_ELF_H
 #define _ASM_CRIS_ELF_H
 
+#include <arch/system.h>
+
 #define ELF_CORE_EFLAGS EF_CRIS_VARIANT_V32
 
 /*
diff --git a/arch/cris/include/arch-v32/arch/system.h b/arch/cris/include/arch-v32/arch/system.h
index 76cea99eaa6..db853fb3a45 100644
--- a/arch/cris/include/arch-v32/arch/system.h
+++ b/arch/cris/include/arch-v32/arch/system.h
@@ -34,14 +34,4 @@ static inline unsigned long rdsp(void)
 /* Write the user-mode stack pointer. */
 #define wrusp(usp) __asm__ __volatile__ ("move %0, $usp" : : "rm" (usp))
 
-#define nop() __asm__ __volatile__ ("nop");
-
-#define xchg(ptr,x) \
-	((__typeof__(*(ptr)))__xchg((unsigned long) (x),(ptr),sizeof(*(ptr))))
-
-#define tas(ptr) (xchg((ptr),1))
-
-struct __xchg_dummy { unsigned long a[100]; };
-#define __xg(x) ((struct __xchg_dummy *)(x))
-
 #endif /* _ASM_CRIS_ARCH_SYSTEM_H */
diff --git a/arch/cris/include/asm/atomic.h b/arch/cris/include/asm/atomic.h
index bbf093814db..1056a5dfe04 100644
--- a/arch/cris/include/asm/atomic.h
+++ b/arch/cris/include/asm/atomic.h
@@ -5,7 +5,7 @@
 
 #include <linux/compiler.h>
 #include <linux/types.h>
-#include <asm/system.h>
+#include <asm/cmpxchg.h>
 #include <arch/atomic.h>
 
 /*
diff --git a/arch/cris/include/asm/barrier.h b/arch/cris/include/asm/barrier.h
new file mode 100644
index 00000000000..198ad7fa6b2
--- /dev/null
+++ b/arch/cris/include/asm/barrier.h
@@ -0,0 +1,25 @@
+#ifndef __ASM_CRIS_BARRIER_H
+#define __ASM_CRIS_BARRIER_H
+
+#define nop() __asm__ __volatile__ ("nop");
+
+#define barrier() __asm__ __volatile__("": : :"memory")
+#define mb() barrier()
+#define rmb() mb()
+#define wmb() mb()
+#define read_barrier_depends() do { } while(0)
+#define set_mb(var, value)  do { var = value; mb(); } while (0)
+
+#ifdef CONFIG_SMP
+#define smp_mb()        mb()
+#define smp_rmb()       rmb()
+#define smp_wmb()       wmb()
+#define smp_read_barrier_depends()     read_barrier_depends()
+#else
+#define smp_mb()        barrier()
+#define smp_rmb()       barrier()
+#define smp_wmb()       barrier()
+#define smp_read_barrier_depends()     do { } while(0)
+#endif
+
+#endif /* __ASM_CRIS_BARRIER_H */
diff --git a/arch/cris/include/asm/bitops.h b/arch/cris/include/asm/bitops.h
index a78a2d70cd8..184066ceb1f 100644
--- a/arch/cris/include/asm/bitops.h
+++ b/arch/cris/include/asm/bitops.h
@@ -19,7 +19,6 @@
 #endif
 
 #include <arch/bitops.h>
-#include <asm/system.h>
 #include <linux/atomic.h>
 #include <linux/compiler.h>
 
diff --git a/arch/cris/include/asm/system.h b/arch/cris/include/asm/cmpxchg.h
index ea10592f7d7..b756dac8aa3 100644
--- a/arch/cris/include/asm/system.h
+++ b/arch/cris/include/asm/cmpxchg.h
@@ -1,44 +1,7 @@
-#ifndef __ASM_CRIS_SYSTEM_H
-#define __ASM_CRIS_SYSTEM_H
+#ifndef __ASM_CRIS_CMPXCHG__
+#define __ASM_CRIS_CMPXCHG__
 
 #include <linux/irqflags.h>
-#include <arch/system.h>
-
-/* the switch_to macro calls resume, an asm function in entry.S which does the actual
- * task switching.
- */
-
-extern struct task_struct *resume(struct task_struct *prev, struct task_struct *next, int);
-#define switch_to(prev,next,last) last = resume(prev,next, \
-					 (int)&((struct task_struct *)0)->thread)
-
-#define barrier() __asm__ __volatile__("": : :"memory")
-#define mb() barrier()
-#define rmb() mb()
-#define wmb() mb()
-#define read_barrier_depends() do { } while(0)
-#define set_mb(var, value)  do { var = value; mb(); } while (0)
-
-#ifdef CONFIG_SMP
-#define smp_mb()        mb()
-#define smp_rmb()       rmb()
-#define smp_wmb()       wmb()
-#define smp_read_barrier_depends()     read_barrier_depends()
-#else
-#define smp_mb()        barrier()
-#define smp_rmb()       barrier()
-#define smp_wmb()       barrier()
-#define smp_read_barrier_depends()     do { } while(0)
-#endif
-
-#define iret()
-
-/*
- * disable hlt during certain critical i/o operations
- */
-#define HAVE_DISABLE_HLT
-void disable_hlt(void);
-void enable_hlt(void);
 
 static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
 {
@@ -67,6 +30,11 @@ static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int siz
   return x;
 }
 
+#define xchg(ptr,x) \
+	((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
+
+#define tas(ptr) (xchg((ptr),1))
+
 #include <asm-generic/cmpxchg-local.h>
 
 /*
@@ -82,8 +50,4 @@ static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int siz
 #include <asm-generic/cmpxchg.h>
 #endif
 
-#define arch_align_stack(x) (x)
-
-void default_idle(void);
-
-#endif
+#endif /* __ASM_CRIS_CMPXCHG__ */
diff --git a/arch/cris/include/asm/exec.h b/arch/cris/include/asm/exec.h
new file mode 100644
index 00000000000..9665dab7e25
--- /dev/null
+++ b/arch/cris/include/asm/exec.h
@@ -0,0 +1,6 @@
+#ifndef __ASM_CRIS_EXEC_H
+#define __ASM_CRIS_EXEC_H
+
+#define arch_align_stack(x) (x)
+
+#endif /* __ASM_CRIS_EXEC_H */
diff --git a/arch/cris/include/asm/processor.h b/arch/cris/include/asm/processor.h
index 3f7248f7a1c..4210d72a666 100644
--- a/arch/cris/include/asm/processor.h
+++ b/arch/cris/include/asm/processor.h
@@ -10,10 +10,10 @@
 #ifndef __ASM_CRIS_PROCESSOR_H
 #define __ASM_CRIS_PROCESSOR_H
 
-#include <asm/system.h>
 #include <asm/page.h>
 #include <asm/ptrace.h>
 #include <arch/processor.h>
+#include <arch/system.h>
 
 struct task_struct;
 
@@ -72,4 +72,13 @@ static inline void release_thread(struct task_struct *dead_task)
 
 #define cpu_relax()     barrier()
 
+/*
+ * disable hlt during certain critical i/o operations
+ */
+#define HAVE_DISABLE_HLT
+void disable_hlt(void);
+void enable_hlt(void);
+
+void default_idle(void);
+
 #endif /* __ASM_CRIS_PROCESSOR_H */
diff --git a/arch/cris/include/asm/switch_to.h b/arch/cris/include/asm/switch_to.h
new file mode 100644
index 00000000000..d842e1163ba
--- /dev/null
+++ b/arch/cris/include/asm/switch_to.h
@@ -0,0 +1,12 @@
+#ifndef __ASM_CRIS_SWITCH_TO_H
+#define __ASM_CRIS_SWITCH_TO_H
+
+/* the switch_to macro calls resume, an asm function in entry.S which does the actual
+ * task switching.
+ */
+
+extern struct task_struct *resume(struct task_struct *prev, struct task_struct *next, int);
+#define switch_to(prev,next,last) last = resume(prev,next, \
+					 (int)&((struct task_struct *)0)->thread)
+
+#endif /* __ASM_CRIS_SWITCH_TO_H */