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x86/asm: Improve how GEN_*_SUFFIXED_RMWcc() specify clobbers

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Commit:

  df3405245a ("x86/asm: Add suffix macro for GEN_*_RMWcc()")

... introduced "suffix" RMWcc operations, adding bogus clobber specifiers:
For one, on x86 there's no point explicitly clobbering "cc".

In fact, with GCC properly fixed, this results in an overlap being detected by
the compiler between outputs and clobbers.

Furthermore it seems bad practice to me to have clobber specification
and use of the clobbered register(s) disconnected - it should rather be
at the invocation place of that GEN_{UN,BIN}ARY_SUFFIXED_RMWcc() macros
that the clobber is specified which this particular invocation needs.

Drop the "cc" clobber altogether and move the "cx" one to refcount.h.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/5A8AF1F802000078001A91E1@prv-mh.provo.novell.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Jan Beulich 2018-02-19 07:49:12 -07:00 committed by Ingo Molnar
parent 3b3a9268bb
commit 700b7c5409
2 changed files with 10 additions and 10 deletions
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4
arch/x86/include/asm/refcount.h
View File

@ -67,13 +67,13 @@ static __always_inline __must_check
bool refcount_sub_and_test(unsigned int i, refcount_t *r)
{
GEN_BINARY_SUFFIXED_RMWcc(LOCK_PREFIX "subl", REFCOUNT_CHECK_LT_ZERO,
r->refs.counter, "er", i, "%0", e);
r->refs.counter, "er", i, "%0", e, "cx");
}
static __always_inline __must_check bool refcount_dec_and_test(refcount_t *r)
{
GEN_UNARY_SUFFIXED_RMWcc(LOCK_PREFIX "decl", REFCOUNT_CHECK_LT_ZERO,
r->refs.counter, "%0", e);
r->refs.counter, "%0", e, "cx");
}
static __always_inline __must_check

16
arch/x86/include/asm/rmwcc.h
View File

@ -2,8 +2,7 @@
#ifndef _ASM_X86_RMWcc
#define _ASM_X86_RMWcc
#define __CLOBBERS_MEM "memory"
#define __CLOBBERS_MEM_CC_CX "memory", "cc", "cx"
#define __CLOBBERS_MEM(clb...) "memory", ## clb
#if !defined(__GCC_ASM_FLAG_OUTPUTS__) && defined(CC_HAVE_ASM_GOTO)
@ -40,18 +39,19 @@ do { \
#endif /* defined(__GCC_ASM_FLAG_OUTPUTS__) || !defined(CC_HAVE_ASM_GOTO) */
#define GEN_UNARY_RMWcc(op, var, arg0, cc) \
__GEN_RMWcc(op " " arg0, var, cc, __CLOBBERS_MEM)
__GEN_RMWcc(op " " arg0, var, cc, __CLOBBERS_MEM())
#define GEN_UNARY_SUFFIXED_RMWcc(op, suffix, var, arg0, cc) \
#define GEN_UNARY_SUFFIXED_RMWcc(op, suffix, var, arg0, cc, clobbers...)\
__GEN_RMWcc(op " " arg0 "\n\t" suffix, var, cc, \
__CLOBBERS_MEM_CC_CX)
__CLOBBERS_MEM(clobbers))
#define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc) \
__GEN_RMWcc(op __BINARY_RMWcc_ARG arg0, var, cc, \
__CLOBBERS_MEM, vcon (val))
__CLOBBERS_MEM(), vcon (val))
#define GEN_BINARY_SUFFIXED_RMWcc(op, suffix, var, vcon, val, arg0, cc) \
#define GEN_BINARY_SUFFIXED_RMWcc(op, suffix, var, vcon, val, arg0, cc, \
clobbers...) \
__GEN_RMWcc(op __BINARY_RMWcc_ARG arg0 "\n\t" suffix, var, cc, \
__CLOBBERS_MEM_CC_CX, vcon (val))
__CLOBBERS_MEM(clobbers), vcon (val))
#endif /* _ASM_X86_RMWcc */