Commit afeb96cb authored by Uros Bizjak's avatar Uros Bizjak Committed by Wei Liu
Browse files

x86/hyperv: Use any general-purpose register when saving %cr2 and %cr8 



hv_hvcrash_ctxt_save() in arch/x86/hyperv/hv_crash.c currently saves %cr2
and %cr8 using %eax ("=a"). This unnecessarily forces a specific register.
Update the inline assembly to use a general-purpose register ("=r") for
both %cr2 and %cr8. This makes the code more flexible for the compiler
while producing the same saved context contents.

No functional changes.

Signed-off-by: default avatarUros Bizjak <ubizjak@gmail.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Long Li <longli@microsoft.com>
Cc: Thomas Gleixner <tglx@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: default avatarWei Liu <wei.liu@kernel.org>
parent 2536091d

arch/x86/hyperv/hv_crash.c

+2 −2
Original line number Diff line number Diff line
@@ -204,8 +204,8 @@ static void hv_hvcrash_ctxt_save(void) 
	ctxt->cr0 = native_read_cr0();

	ctxt->cr4 = native_read_cr4();



	asm volatile("movq %%cr2, %0" : "=a"(ctxt->cr2));

	asm volatile("movq %%cr8, %0" : "=a"(ctxt->cr8));

	asm volatile("movq %%cr2, %0" : "=r"(ctxt->cr2));

	asm volatile("movq %%cr8, %0" : "=r"(ctxt->cr8));



	asm volatile("movw %%cs, %0" : "=m"(ctxt->cs));

	asm volatile("movw %%ss, %0" : "=m"(ctxt->ss));