Commit-ID: 91c5f0de64a226e0d9c558b26ef7c2655ef31cca Gitweb: https://git.kernel.org/tip/91c5f0de64a226e0d9c558b26ef7c2655ef31cca Author: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx> AuthorDate: Tue, 6 Mar 2018 22:18:09 +0100 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Wed, 7 Mar 2018 07:57:31 +0100 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@xxxxxxxxxxxxxxxxxxxx> Acked-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Acked-by: Andy Lutomirski <luto@xxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Brian Gerst <brgerst@xxxxxxxxx> Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx> Cc: H. Peter Anvin <hpa@xxxxxxxxx> Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: luto@xxxxxxxxxxxxxx Cc: viro@xxxxxxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- arch/x86/entry/entry_64_compat.S | 4 +--- 1 file changed, 1 insertion(+), 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 */ -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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