diff options
| author |   Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-06 22:18:09 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2018-03-07 07:57:31 +0100 |
| commit | 91c5f0de64a226e0d9c558b26ef7c2655ef31cca (patch) | |
| tree | e273a51fa07088bfff75fa9caf4f4c55dd1fc2c9 /arch | |
| parent | x86/entry: Do not special-case clone(2) in compat entry (diff) | |
| download | linux-dev-91c5f0de64a226e0d9c558b26ef7c2655ef31cca.tar.xz linux-dev-91c5f0de64a226e0d9c558b26ef7c2655ef31cca.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/entry/entry_64_compat.S | 4 |
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 */ |