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: Uros Bizjak <[email protected]> Cc: "K. Y. Srinivasan" <[email protected]> Cc: Haiyang Zhang <[email protected]> Cc: Wei Liu <[email protected]> Cc: Dexuan Cui <[email protected]> Cc: Long Li <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Dave Hansen <[email protected]> Cc: "H. Peter Anvin" <[email protected]> --- arch/x86/hyperv/hv_crash.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/hyperv/hv_crash.c b/arch/x86/hyperv/hv_crash.c index d0f95a278fdb..5ffcc23255de 100644 --- a/arch/x86/hyperv/hv_crash.c +++ b/arch/x86/hyperv/hv_crash.c @@ -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)); -- 2.53.0
