Messages in this thread Patch in this message | | | Date | Fri, 5 Apr 2019 06:13:19 -0700 | From | tip-bot for Valentin Schneider <> | Subject | [tip:x86/entry] x86/entry: Remove unneeded need_resched() loop |
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Commit-ID: b5b447b6b4e899e0978b95cb42d272978f8c7b4d Gitweb: https://git.kernel.org/tip/b5b447b6b4e899e0978b95cb42d272978f8c7b4d Author: Valentin Schneider <valentin.schneider@arm.com> AuthorDate: Mon, 11 Mar 2019 22:47:51 +0000 Committer: Thomas Gleixner <tglx@linutronix.de> CommitDate: Fri, 5 Apr 2019 15:08:03 +0200
x86/entry: Remove unneeded need_resched() loop
Since the enabling and disabling of IRQs within preempt_schedule_irq() is contained in a need_resched() loop, there is no need for the outer architecture specific loop.
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Link: https://lkml.kernel.org/r/20190311224752.8337-14-valentin.schneider@arm.com
--- arch/x86/entry/entry_32.S | 3 +-- arch/x86/entry/entry_64.S | 3 +-- 2 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S index d309f30cf7af..b1856fe9decf 100644 --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -766,13 +766,12 @@ END(ret_from_exception) #ifdef CONFIG_PREEMPT ENTRY(resume_kernel) DISABLE_INTERRUPTS(CLBR_ANY) -.Lneed_resched: cmpl $0, PER_CPU_VAR(__preempt_count) jnz restore_all_kernel testl $X86_EFLAGS_IF, PT_EFLAGS(%esp) # interrupts off (exception path) ? jz restore_all_kernel call preempt_schedule_irq - jmp .Lneed_resched + jmp restore_all_kernel END(resume_kernel) #endif diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 1f0efdb7b629..e7e270603fe7 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -645,10 +645,9 @@ retint_kernel: /* Check if we need preemption */ btl $9, EFLAGS(%rsp) /* were interrupts off? */ jnc 1f -0: cmpl $0, PER_CPU_VAR(__preempt_count) + cmpl $0, PER_CPU_VAR(__preempt_count) jnz 1f call preempt_schedule_irq - jmp 0b 1: #endif /*
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