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Commit 1b674bf1 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-atomic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86/atomic changes from Ingo Molnar.

* 'x86-atomic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86: atomic64 assembly improvements
  x86: Adjust asm constraints in atomic64 wrappers
parents e17fdf5c cb8095bb

arch/x86/include/asm/alternative.h

+6 −0
Original line number Diff line number Diff line
@@ -145,6 +145,12 @@ static inline int alternatives_text_reserved(void *start, void *end) 
 */

#define ASM_OUTPUT2(a...) a



/*

 * use this macro if you need clobbers but no inputs in

 * alternative_{input,io,call}()

 */

#define ASM_NO_INPUT_CLOBBER(clbr...) "i" (0) : clbr



struct paravirt_patch_site;

#ifdef CONFIG_PARAVIRT

void apply_paravirt(struct paravirt_patch_site *start,

arch/x86/include/asm/atomic64_32.h

+79 −67
Original line number Diff line number Diff line
@@ -14,13 +14,52 @@ typedef struct { 


#define ATOMIC64_INIT(val)	{ (val) }



#define __ATOMIC64_DECL(sym) void atomic64_##sym(atomic64_t *, ...)

#ifndef ATOMIC64_EXPORT

#define ATOMIC64_DECL_ONE __ATOMIC64_DECL

#else

#define ATOMIC64_DECL_ONE(sym) __ATOMIC64_DECL(sym); \

	ATOMIC64_EXPORT(atomic64_##sym)

#endif



#ifdef CONFIG_X86_CMPXCHG64

#define ATOMIC64_ALTERNATIVE_(f, g) "call atomic64_" #g "_cx8"

#define __alternative_atomic64(f, g, out, in...) \

	asm volatile("call %P[func]" \

		     : out : [func] "i" (atomic64_##g##_cx8), ## in)



#define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8)

#else

#define ATOMIC64_ALTERNATIVE_(f, g) ALTERNATIVE("call atomic64_" #f "_386", "call atomic64_" #g "_cx8", X86_FEATURE_CX8)

#define __alternative_atomic64(f, g, out, in...) \

	alternative_call(atomic64_##f##_386, atomic64_##g##_cx8, \

			 X86_FEATURE_CX8, ASM_OUTPUT2(out), ## in)



#define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8); \

	ATOMIC64_DECL_ONE(sym##_386)



ATOMIC64_DECL_ONE(add_386);

ATOMIC64_DECL_ONE(sub_386);

ATOMIC64_DECL_ONE(inc_386);

ATOMIC64_DECL_ONE(dec_386);

#endif



#define ATOMIC64_ALTERNATIVE(f) ATOMIC64_ALTERNATIVE_(f, f)

#define alternative_atomic64(f, out, in...) \

	__alternative_atomic64(f, f, ASM_OUTPUT2(out), ## in)



ATOMIC64_DECL(read);

ATOMIC64_DECL(set);

ATOMIC64_DECL(xchg);

ATOMIC64_DECL(add_return);

ATOMIC64_DECL(sub_return);

ATOMIC64_DECL(inc_return);

ATOMIC64_DECL(dec_return);

ATOMIC64_DECL(dec_if_positive);

ATOMIC64_DECL(inc_not_zero);

ATOMIC64_DECL(add_unless);



#undef ATOMIC64_DECL

#undef ATOMIC64_DECL_ONE

#undef __ATOMIC64_DECL

#undef ATOMIC64_EXPORT



/**

 * atomic64_cmpxchg - cmpxchg atomic64 variable
@@ -50,11 +89,9 @@ static inline long long atomic64_xchg(atomic64_t *v, long long n) 
	long long o;

	unsigned high = (unsigned)(n >> 32);

	unsigned low = (unsigned)n;

	asm volatile(ATOMIC64_ALTERNATIVE(xchg)

		     : "=A" (o), "+b" (low), "+c" (high)

		     : "S" (v)

		     : "memory"

		     );

	alternative_atomic64(xchg, "=&A" (o),

			     "S" (v), "b" (low), "c" (high)

			     : "memory");

	return o;

}
@@ -69,11 +106,9 @@ static inline void atomic64_set(atomic64_t *v, long long i) 
{

	unsigned high = (unsigned)(i >> 32);

	unsigned low = (unsigned)i;

	asm volatile(ATOMIC64_ALTERNATIVE(set)

		     : "+b" (low), "+c" (high)

		     : "S" (v)

		     : "eax", "edx", "memory"

		     );

	alternative_atomic64(set, /* no output */,

			     "S" (v), "b" (low), "c" (high)

			     : "eax", "edx", "memory");

}



/**
@@ -85,10 +120,7 @@ static inline void atomic64_set(atomic64_t *v, long long i) 
static inline long long atomic64_read(const atomic64_t *v)

{

	long long r;

	asm volatile(ATOMIC64_ALTERNATIVE(read)

		     : "=A" (r), "+c" (v)

		     : : "memory"

		     );

	alternative_atomic64(read, "=&A" (r), "c" (v) : "memory");

	return r;

 }
@@ -101,10 +133,9 @@ static inline long long atomic64_read(const atomic64_t *v) 
 */

static inline long long atomic64_add_return(long long i, atomic64_t *v)

{

	asm volatile(ATOMIC64_ALTERNATIVE(add_return)

		     : "+A" (i), "+c" (v)

		     : : "memory"

		     );

	alternative_atomic64(add_return,

			     ASM_OUTPUT2("+A" (i), "+c" (v)),

			     ASM_NO_INPUT_CLOBBER("memory"));

	return i;

}
@@ -113,32 +144,25 @@ static inline long long atomic64_add_return(long long i, atomic64_t *v) 
 */

static inline long long atomic64_sub_return(long long i, atomic64_t *v)

{

	asm volatile(ATOMIC64_ALTERNATIVE(sub_return)

		     : "+A" (i), "+c" (v)

		     : : "memory"

		     );

	alternative_atomic64(sub_return,

			     ASM_OUTPUT2("+A" (i), "+c" (v)),

			     ASM_NO_INPUT_CLOBBER("memory"));

	return i;

}



static inline long long atomic64_inc_return(atomic64_t *v)

{

	long long a;

	asm volatile(ATOMIC64_ALTERNATIVE(inc_return)

		     : "=A" (a)

		     : "S" (v)

		     : "memory", "ecx"

		     );

	alternative_atomic64(inc_return, "=&A" (a),

			     "S" (v) : "memory", "ecx");

	return a;

}



static inline long long atomic64_dec_return(atomic64_t *v)

{

	long long a;

	asm volatile(ATOMIC64_ALTERNATIVE(dec_return)

		     : "=A" (a)

		     : "S" (v)

		     : "memory", "ecx"

		     );

	alternative_atomic64(dec_return, "=&A" (a),

			     "S" (v) : "memory", "ecx");

	return a;

}
@@ -151,10 +175,9 @@ static inline long long atomic64_dec_return(atomic64_t *v) 
 */

static inline long long atomic64_add(long long i, atomic64_t *v)

{

	asm volatile(ATOMIC64_ALTERNATIVE_(add, add_return)

		     : "+A" (i), "+c" (v)

		     : : "memory"

		     );

	__alternative_atomic64(add, add_return,

			       ASM_OUTPUT2("+A" (i), "+c" (v)),

			       ASM_NO_INPUT_CLOBBER("memory"));

	return i;

}
@@ -167,10 +190,9 @@ static inline long long atomic64_add(long long i, atomic64_t *v) 
 */

static inline long long atomic64_sub(long long i, atomic64_t *v)

{

	asm volatile(ATOMIC64_ALTERNATIVE_(sub, sub_return)

		     : "+A" (i), "+c" (v)

		     : : "memory"

		     );

	__alternative_atomic64(sub, sub_return,

			       ASM_OUTPUT2("+A" (i), "+c" (v)),

			       ASM_NO_INPUT_CLOBBER("memory"));

	return i;

}
@@ -196,10 +218,8 @@ static inline int atomic64_sub_and_test(long long i, atomic64_t *v) 
 */

static inline void atomic64_inc(atomic64_t *v)

{

	asm volatile(ATOMIC64_ALTERNATIVE_(inc, inc_return)

		     : : "S" (v)

		     : "memory", "eax", "ecx", "edx"

		     );

	__alternative_atomic64(inc, inc_return, /* no output */,

			       "S" (v) : "memory", "eax", "ecx", "edx");

}



/**
@@ -210,10 +230,8 @@ static inline void atomic64_inc(atomic64_t *v) 
 */

static inline void atomic64_dec(atomic64_t *v)

{

	asm volatile(ATOMIC64_ALTERNATIVE_(dec, dec_return)

		     : : "S" (v)

		     : "memory", "eax", "ecx", "edx"

		     );

	__alternative_atomic64(dec, dec_return, /* no output */,

			       "S" (v) : "memory", "eax", "ecx", "edx");

}



/**
@@ -263,15 +281,15 @@ static inline int atomic64_add_negative(long long i, atomic64_t *v) 
 * @u: ...unless v is equal to u.

 *

 * Atomically adds @a to @v, so long as it was not @u.

 * Returns the old value of @v.

 * Returns non-zero if the add was done, zero otherwise.

 */

static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u)

{

	unsigned low = (unsigned)u;

	unsigned high = (unsigned)(u >> 32);

	asm volatile(ATOMIC64_ALTERNATIVE(add_unless) "\n\t"

		     : "+A" (a), "+c" (v), "+S" (low), "+D" (high)

		     : : "memory");

	alternative_atomic64(add_unless,

			     ASM_OUTPUT2("+A" (a), "+c" (low), "+D" (high)),

			     "S" (v) : "memory");

	return (int)a;

}
@@ -279,26 +297,20 @@ static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u) 
static inline int atomic64_inc_not_zero(atomic64_t *v)

{

	int r;

	asm volatile(ATOMIC64_ALTERNATIVE(inc_not_zero)

		     : "=a" (r)

		     : "S" (v)

		     : "ecx", "edx", "memory"

		     );

	alternative_atomic64(inc_not_zero, "=&a" (r),

			     "S" (v) : "ecx", "edx", "memory");

	return r;

}



static inline long long atomic64_dec_if_positive(atomic64_t *v)

{

	long long r;

	asm volatile(ATOMIC64_ALTERNATIVE(dec_if_positive)

		     : "=A" (r)

		     : "S" (v)

		     : "ecx", "memory"

		     );

	alternative_atomic64(dec_if_positive, "=&A" (r),

			     "S" (v) : "ecx", "memory");

	return r;

}



#undef ATOMIC64_ALTERNATIVE

#undef ATOMIC64_ALTERNATIVE_

#undef alternative_atomic64

#undef __alternative_atomic64



#endif /* _ASM_X86_ATOMIC64_32_H */

arch/x86/lib/atomic64_32.c

+2 −57
Original line number Diff line number Diff line 
#include <linux/compiler.h>

#include <linux/module.h>

#include <linux/types.h>

#define ATOMIC64_EXPORT EXPORT_SYMBOL



#include <asm/processor.h>

#include <asm/cmpxchg.h>

#include <linux/export.h>

#include <linux/atomic.h>
 


long long atomic64_read_cx8(long long, const atomic64_t *v);

EXPORT_SYMBOL(atomic64_read_cx8);

long long atomic64_set_cx8(long long, const atomic64_t *v);

EXPORT_SYMBOL(atomic64_set_cx8);

long long atomic64_xchg_cx8(long long, unsigned high);

EXPORT_SYMBOL(atomic64_xchg_cx8);

long long atomic64_add_return_cx8(long long a, atomic64_t *v);

EXPORT_SYMBOL(atomic64_add_return_cx8);

long long atomic64_sub_return_cx8(long long a, atomic64_t *v);

EXPORT_SYMBOL(atomic64_sub_return_cx8);

long long atomic64_inc_return_cx8(long long a, atomic64_t *v);

EXPORT_SYMBOL(atomic64_inc_return_cx8);

long long atomic64_dec_return_cx8(long long a, atomic64_t *v);

EXPORT_SYMBOL(atomic64_dec_return_cx8);

long long atomic64_dec_if_positive_cx8(atomic64_t *v);

EXPORT_SYMBOL(atomic64_dec_if_positive_cx8);

int atomic64_inc_not_zero_cx8(atomic64_t *v);

EXPORT_SYMBOL(atomic64_inc_not_zero_cx8);

int atomic64_add_unless_cx8(atomic64_t *v, long long a, long long u);

EXPORT_SYMBOL(atomic64_add_unless_cx8);



#ifndef CONFIG_X86_CMPXCHG64

long long atomic64_read_386(long long, const atomic64_t *v);

EXPORT_SYMBOL(atomic64_read_386);

long long atomic64_set_386(long long, const atomic64_t *v);

EXPORT_SYMBOL(atomic64_set_386);

long long atomic64_xchg_386(long long, unsigned high);

EXPORT_SYMBOL(atomic64_xchg_386);

long long atomic64_add_return_386(long long a, atomic64_t *v);

EXPORT_SYMBOL(atomic64_add_return_386);

long long atomic64_sub_return_386(long long a, atomic64_t *v);

EXPORT_SYMBOL(atomic64_sub_return_386);

long long atomic64_inc_return_386(long long a, atomic64_t *v);

EXPORT_SYMBOL(atomic64_inc_return_386);

long long atomic64_dec_return_386(long long a, atomic64_t *v);

EXPORT_SYMBOL(atomic64_dec_return_386);

long long atomic64_add_386(long long a, atomic64_t *v);

EXPORT_SYMBOL(atomic64_add_386);

long long atomic64_sub_386(long long a, atomic64_t *v);

EXPORT_SYMBOL(atomic64_sub_386);

long long atomic64_inc_386(long long a, atomic64_t *v);

EXPORT_SYMBOL(atomic64_inc_386);

long long atomic64_dec_386(long long a, atomic64_t *v);

EXPORT_SYMBOL(atomic64_dec_386);

long long atomic64_dec_if_positive_386(atomic64_t *v);

EXPORT_SYMBOL(atomic64_dec_if_positive_386);

int atomic64_inc_not_zero_386(atomic64_t *v);

EXPORT_SYMBOL(atomic64_inc_not_zero_386);

int atomic64_add_unless_386(atomic64_t *v, long long a, long long u);

EXPORT_SYMBOL(atomic64_add_unless_386);

#endif

arch/x86/lib/atomic64_386_32.S

+3 −3
Original line number Diff line number Diff line
@@ -137,13 +137,13 @@ BEGIN(dec_return) 
RET_ENDP

#undef v



#define v %ecx

#define v %esi

BEGIN(add_unless)

	addl %eax, %esi

	addl %eax, %ecx

	adcl %edx, %edi

	addl  (v), %eax

	adcl 4(v), %edx

	cmpl %eax, %esi

	cmpl %eax, %ecx

	je 3f

1:

	movl %eax,  (v)

arch/x86/lib/atomic64_cx8_32.S

+11 −18
Original line number Diff line number Diff line
@@ -55,8 +55,6 @@ ENDPROC(atomic64_set_cx8) 
ENTRY(atomic64_xchg_cx8)

	CFI_STARTPROC



	movl %ebx, %eax

	movl %ecx, %edx

1:

	LOCK_PREFIX

	cmpxchg8b (%esi)
@@ -78,7 +76,7 @@ ENTRY(atomic64_\func\()_return_cx8) 
	movl %edx, %edi

	movl %ecx, %ebp



	read64 %ebp

	read64 %ecx

1:

	movl %eax, %ebx

	movl %edx, %ecx
@@ -159,23 +157,22 @@ ENTRY(atomic64_add_unless_cx8) 
	SAVE ebx

/* these just push these two parameters on the stack */

	SAVE edi

	SAVE esi

	SAVE ecx



	movl %ecx, %ebp

	movl %eax, %esi

	movl %eax, %ebp

	movl %edx, %edi



	read64 %ebp

	read64 %esi

1:

	cmpl %eax, 0(%esp)

	je 4f

2:

	movl %eax, %ebx

	movl %edx, %ecx

	addl %esi, %ebx

	addl %ebp, %ebx

	adcl %edi, %ecx

	LOCK_PREFIX

	cmpxchg8b (%ebp)

	cmpxchg8b (%esi)

	jne 1b



	movl $1, %eax
@@ -199,13 +196,13 @@ ENTRY(atomic64_inc_not_zero_cx8) 


	read64 %esi

1:

	testl %eax, %eax

	je 4f

2:

	movl %eax, %ecx

	orl %edx, %ecx

	jz 3f

	movl %eax, %ebx

	movl %edx, %ecx

	xorl %ecx, %ecx

	addl $1, %ebx

	adcl $0, %ecx

	adcl %edx, %ecx

	LOCK_PREFIX

	cmpxchg8b (%esi)

	jne 1b
@@ -214,9 +211,5 @@ ENTRY(atomic64_inc_not_zero_cx8) 
3:

	RESTORE ebx

	ret

4:

	testl %edx, %edx

	jne 2b

	jmp 3b

	CFI_ENDPROC

ENDPROC(atomic64_inc_not_zero_cx8)