On Wed, Jul 10, 2024 at 07:06:38PM +0300, Alexander Shishkin wrote: > From: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > > Provide inline memcpy and memset functions that can be used instead of > the GCC builtins whenever necessary. > > Code posted by Peter Zijlstra <peterz@xxxxxxxxxxxxx>. We haz a tag for that: Originally-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Link: https://lore.kernel.org/lkml/Y759AJ%2F0N9fqwDED@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ > [Missing Signed-off-by from PeterZ] There, lemme fix that for you: Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> > Signed-off-by: Sohil Mehta <sohil.mehta@xxxxxxxxx> > Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> > --- > arch/x86/include/asm/string.h | 26 ++++++++++++++++++++++++++ > 1 file changed, 26 insertions(+) > > diff --git a/arch/x86/include/asm/string.h b/arch/x86/include/asm/string.h > index c3c2c1914d65..9cb5aae7fba9 100644 > --- a/arch/x86/include/asm/string.h > +++ b/arch/x86/include/asm/string.h > @@ -1,6 +1,32 @@ > /* SPDX-License-Identifier: GPL-2.0 */ > +#ifndef _ASM_X86_STRING_H > +#define _ASM_X86_STRING_H > + > #ifdef CONFIG_X86_32 > # include <asm/string_32.h> > #else > # include <asm/string_64.h> > #endif > + > +static __always_inline void *__inline_memcpy(void *to, const void *from, size_t len) > +{ > + void *ret = to; > + > + asm volatile("rep movsb" > + : "+D" (to), "+S" (from), "+c" (len) > + : : "memory"); > + return ret; > +} > + > +static __always_inline void *__inline_memset(void *s, int v, size_t n) > +{ > + void *ret = s; > + > + asm volatile("rep stosb" > + : "+D" (s), "+c" (n) > + : "a" ((uint8_t)v) > + : "memory"); > + return ret; > +} > + > +#endif /* _ASM_X86_STRING_H */ > -- > 2.43.0 >
