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alpha: Eliminate compiler warning from memset macro 

Compiling with GCC 4.8 yields several instances of

crypto/vmac.c: In function ‘vmac_final’:
crypto/vmac.c:616:9: warning: value computed is not used [-Wunused-value]
  memset(&mac, 0, sizeof(vmac_t));
         ^
arch/alpha/include/asm/string.h:31:25: note: in definition of macro ‘memset’
     ? __builtin_memset((s),0,(n))          \
                         ^
Converting the macro to an inline function eliminates this problem.

However, doing only that causes problems with the GCC 3.x series.  The
inline function cannot be named "memset", as otherwise we wind up with
recursion via __builtin_memset.  Solve this by adjusting the symbols
such that __memset is the inline, and ___memset is the real function.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-07-11 09:47:45 -07:00 committed by Matt Turner
parent 673fdfe3f0
commit a47e5bb576
4 changed files with 33 additions and 15 deletions
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24
arch/alpha/include/asm/string.h
View File

@ -22,15 +22,27 @@ extern void * __memcpy(void *, const void *, size_t);
#define __HAVE_ARCH_MEMSET
extern void * __constant_c_memset(void *, unsigned long, size_t);
extern void * ___memset(void *, int, size_t);
extern void * __memset(void *, int, size_t);
extern void * memset(void *, int, size_t);
#define memset(s, c, n) \
(__builtin_constant_p(c) \
? (__builtin_constant_p(n) && (c) == 0 \
? __builtin_memset((s),0,(n)) \
: __constant_c_memset((s),0x0101010101010101UL*(unsigned char)(c),(n))) \
: __memset((s),(c),(n)))
/* For gcc 3.x, we cannot have the inline function named "memset" because
the __builtin_memset will attempt to resolve to the inline as well,
leading to a "sorry" about unimplemented recursive inlining. */
extern inline void *__memset(void *s, int c, size_t n)
{
if (__builtin_constant_p(c)) {
if (__builtin_constant_p(n)) {
return __builtin_memset(s, c, n);
} else {
unsigned long c8 = (c & 0xff) * 0x0101010101010101UL;
return __constant_c_memset(s, c8, n);
}
}
return ___memset(s, c, n);
}
#define memset __memset
#define __HAVE_ARCH_STRCPY
extern char * strcpy(char *,const char *);

1
arch/alpha/kernel/alpha_ksyms.c
View File

@ -40,6 +40,7 @@ EXPORT_SYMBOL(strrchr);
EXPORT_SYMBOL(memmove);
EXPORT_SYMBOL(__memcpy);
EXPORT_SYMBOL(__memset);
EXPORT_SYMBOL(___memset);
EXPORT_SYMBOL(__memsetw);
EXPORT_SYMBOL(__constant_c_memset);
EXPORT_SYMBOL(copy_page);

12
arch/alpha/lib/ev6-memset.S
View File

@ -30,14 +30,15 @@
.set noat
.set noreorder
.text
.globl memset
.globl __memset
.globl ___memset
.globl __memsetw
.globl __constant_c_memset
.globl memset
.ent __memset
.ent ___memset
.align 5
__memset:
___memset:
.frame $30,0,$26,0
.prologue 0
@ -227,7 +228,7 @@ end_b:
nop
nop
ret $31,($26),1 # L0 :
.end __memset
.end ___memset
/*
* This is the original body of code, prior to replication and
@ -594,4 +595,5 @@ end_w:
.end __memsetw
memset = __memset
memset = ___memset
__memset = ___memset

11
arch/alpha/lib/memset.S
View File

@ -19,11 +19,13 @@
.text
.globl memset
.globl __memset
.globl ___memset
.globl __memsetw
.globl __constant_c_memset
.ent __memset
.ent ___memset
.align 5
__memset:
___memset:
.frame $30,0,$26,0
.prologue 0
@ -103,7 +105,7 @@ within_one_quad:
end:
ret $31,($26),1 /* E1 */
.end __memset
.end ___memset
.align 5
.ent __memsetw
@ -121,4 +123,5 @@ __memsetw:
.end __memsetw
memset = __memset
memset = ___memset
__memset = ___memset