From 91c5f0de64a226e0d9c558b26ef7c2655ef31cca Mon Sep 17 00:00:00 2001 From: Dominik Brodowski Date: Tue, 6 Mar 2018 22:18:09 +0100 Subject: x86/entry/64/compat: Save one instruction in entry_INT80_compat() As %rdi is never user except in the following push, there is no need to restore %rdi to the original value. Signed-off-by: Dominik Brodowski Acked-by: Linus Torvalds Acked-by: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Josh Poimboeuf Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: luto@amacapital.net Cc: viro@zeniv.linux.org.uk Signed-off-by: Ingo Molnar --- arch/x86/entry/entry_64_compat.S | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'arch/x86') diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S index ff61b7bb750b..08425c42f8b7 100644 --- a/arch/x86/entry/entry_64_compat.S +++ b/arch/x86/entry/entry_64_compat.S @@ -363,9 +363,7 @@ ENTRY(entry_INT80_compat) pushq 2*8(%rdi) /* regs->ip */ pushq 1*8(%rdi) /* regs->orig_ax */ - movq (%rdi), %rdi /* restore %rdi */ - - pushq %rdi /* pt_regs->di */ + pushq (%rdi) /* pt_regs->di */ pushq %rsi /* pt_regs->si */ pushq %rdx /* pt_regs->dx */ pushq %rcx /* pt_regs->cx */ -- cgit v1.2.3-58-ga151