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x86: atomic64: Improve atomic64_xchg()

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Remove the read-first logic from atomic64_xchg() and simplify
the loop.

This function was the last user of __atomic64_read() - remove it.

Also, change the 'real_val' assumption from the somewhat quirky
1ULL << 32 value to the (just as arbitrary, but simpler) value
of 0.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
LKML-Reference: <tip-05118ab8859492ac9ddda0154cf90e37b0a4a0b0@git.kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-07-03 19:56:36 +02:00
parent 1fde902d52
commit 3a8d1788b3
2 changed files with 15 additions and 15 deletions
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9
arch/x86/include/asm/atomic_32.h
View File

@ -268,15 +268,6 @@ typedef struct {
#define ATOMIC64_INIT(val) { (val) }
/**
* atomic64_read - read atomic64 variable
* @ptr: pointer of type atomic64_t
*
* Atomically reads the value of @v.
* Doesn't imply a read memory barrier.
*/
#define __atomic64_read(ptr) ((ptr)->counter)
extern u64 atomic64_cmpxchg(atomic64_t *ptr, u64 old_val, u64 new_val);
/**

21
arch/x86/lib/atomic64_32.c
View File

@ -33,14 +33,23 @@ EXPORT_SYMBOL(atomic64_cmpxchg);
* Atomically xchgs the value of @ptr to @new_val and returns
* the old value.
*/
u64 atomic64_xchg(atomic64_t *ptr, u64 new_val)
{
u64 old_val;
/*
* Try first with a (possibly incorrect) assumption about
* what we have there. We'll do two loops most likely,
* but we'll get an ownership MESI transaction straight away
* instead of a read transaction followed by a
* flush-for-ownership transaction:
*/
u64 old_val, real_val = 0;
do {
old_val = __atomic64_read(ptr);
} while (atomic64_cmpxchg(ptr, old_val, new_val) != old_val);
old_val = real_val;
real_val = atomic64_cmpxchg(ptr, old_val, new_val);
} while (real_val != old_val);
return old_val;
}
@ -91,13 +100,13 @@ EXPORT_SYMBOL(atomic64_read);
noinline u64 atomic64_add_return(u64 delta, atomic64_t *ptr)
{
/*
* Try first with a (probably incorrect) assumption about
* Try first with a (possibly incorrect) assumption about
* what we have there. We'll do two loops most likely,
* but we'll get an ownership MESI transaction straight away
* instead of a read transaction followed by a
* flush-for-ownership transaction:
*/
u64 old_val, new_val, real_val = 1ULL << 32;
u64 old_val, new_val, real_val = 0;
do {
old_val = real_val;