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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-07 00:18:09 +0300
committerIngo Molnar <mingo@kernel.org>2018-03-07 09:57:31 +0300
commit91c5f0de64a226e0d9c558b26ef7c2655ef31cca (patch)
treee273a51fa07088bfff75fa9caf4f4c55dd1fc2c9
parentaf52201d991624d2d5adce2c123805b3d42a8d4d (diff)
downloadlinux-91c5f0de64a226e0d9c558b26ef7c2655ef31cca.tar.xz
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 <linux@dominikbrodowski.net> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Acked-by: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: luto@amacapital.net Cc: viro@zeniv.linux.org.uk Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--arch/x86/entry/entry_64_compat.S4
1 files changed, 1 insertions, 3 deletions
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 */