Commit df729fb0 authored by H. Peter Anvin (Intel)'s avatar H. Peter Anvin (Intel) Committed by Ingo Molnar
Browse files

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: default avatarH. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: default avatarXin Li <xin3.li@intel.com>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230112072032.35626-4-xin3.li@intel.com
parent 5a91f126

arch/x86/entry/entry_64.S

+1 −1
Original line number Diff line number Diff line
@@ -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.

 */

arch/x86/include/asm/special_insns.h

+1 −1
Original line number Diff line number Diff line
@@ -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)

{