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alpha: add support for memset16 

Alpha already had an optimised fill-memory-with-16-bit-quantity
assembler routine called memsetw().  It has a slightly different calling
convention from memset16() in that it takes a byte count, not a count of
words.  That's the same convention used by ARM's __memset routines, so
rename Alpha's routine to match and add a memset16() wrapper around it.
Then convert Alpha's scr_memsetw() to call memset16() instead of
memsetw().

Link: http://lkml.kernel.org/r/20170720184539.31609-6-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: David Miller <davem@davemloft.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox 2017-09-08 16:14:04 -07:00 committed by Linus Torvalds
parent fd1d362600
commit 92ce4c3ea7
3 changed files with 14 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
arch/alpha/include/asm/string.h
View File

@ -65,13 +65,14 @@ extern void * memchr(const void *, int, size_t);
aligned values. The DEST and COUNT parameters must be even for
correct operation. */
#define __HAVE_ARCH_MEMSETW
extern void * __memsetw(void *dest, unsigned short, size_t count);
#define memsetw(s, c, n) \
(__builtin_constant_p(c) \
? __constant_c_memset((s),0x0001000100010001UL*(unsigned short)(c),(n)) \
: __memsetw((s),(c),(n)))
#define __HAVE_ARCH_MEMSET16
extern void * __memset16(void *dest, unsigned short, size_t count);
static inline void *memset16(uint16_t *p, uint16_t v, size_t n)
{
if (__builtin_constant_p(v))
return __constant_c_memset(p, 0x0001000100010001UL * v, n * 2);
return __memset16(p, v, n * 2);
}
#endif /* __KERNEL__ */

2
arch/alpha/include/asm/vga.h
View File

@ -34,7 +34,7 @@ static inline void scr_memsetw(u16 *s, u16 c, unsigned int count)
if (__is_ioaddr(s))
memsetw_io((u16 __iomem *) s, c, count);
else
memsetw(s, c, count);
memset16(s, c, count / 2);
}
/* Do not trust that the usage will be correct; analyze the arguments. */

10
arch/alpha/lib/memset.S
View File

@ -20,7 +20,7 @@
.globl memset
.globl __memset
.globl ___memset
.globl __memsetw
.globl __memset16
.globl __constant_c_memset
.ent ___memset
@ -110,8 +110,8 @@ EXPORT_SYMBOL(___memset)
EXPORT_SYMBOL(__constant_c_memset)
.align 5
.ent __memsetw
__memsetw:
.ent __memset16
__memset16:
.prologue 0
inswl $17,0,$1 /* E0 */
@ -123,8 +123,8 @@ __memsetw:
or $1,$4,$17 /* E0 */
br __constant_c_memset /* .. E1 */
.end __memsetw
EXPORT_SYMBOL(__memsetw)
.end __memset16
EXPORT_SYMBOL(__memset16)
memset = ___memset
__memset = ___memset