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x86/gsseg: Make asm_load_gs_index() take an u16 

Let GCC know that only the low 16 bits of load_gs_index() argument
actually matter. It might allow it to create slightly better
code. However, do not propagate this into the prototypes of functions
that end up being paravirtualized, to avoid unnecessary changes.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230112072032.35626-4-xin3.li@intel.com
This commit is contained in:
H. Peter Anvin (Intel) 2023-01-11 23:20:30 -08:00 committed by Ingo Molnar
parent 5a91f12660
commit df729fb05a
2 changed files with 2 additions and 2 deletions
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2
arch/x86/entry/entry_64.S
View File

@ -782,7 +782,7 @@ _ASM_NOKPROBE(common_interrupt_return)
/*
* Reload gs selector with exception handling
* edi: new selector
* di: new selector
*
* Is in entry.text as it shouldn't be instrumented.
*/

2
arch/x86/include/asm/special_insns.h
View File

@ -120,7 +120,7 @@ static inline void native_wbinvd(void)
asm volatile("wbinvd": : :"memory");
}
extern asmlinkage void asm_load_gs_index(unsigned int selector);
extern asmlinkage void asm_load_gs_index(u16 selector);
static inline void native_load_gs_index(unsigned int selector)
{