Commit-ID: b664d57f39d01e775204d4f1a7e2f8bda77bc549 Gitweb: https://git.kernel.org/tip/b664d57f39d01e775204d4f1a7e2f8bda77bc549 Author: Masami Hiramatsu <[email protected]> AuthorDate: Tue, 3 Oct 2017 16:18:02 +0900 Committer: Ingo Molnar <[email protected]> CommitDate: Tue, 3 Oct 2017 19:11:48 +0200
kprobes/x86: Remove IRQ disabling from jprobe handlers Jprobes actually don't need to disable IRQs while calling handlers, because of how we specify the kernel interface in Documentation/kprobes.txt: ----- Probe handlers are run with preemption disabled. Depending on the architecture and optimization state, handlers may also run with interrupts disabled (e.g., kretprobe handlers and optimized kprobe handlers run without interrupt disabled on x86/x86-64). ----- So let's remove IRQ disabling from jprobes too. Signed-off-by: Masami Hiramatsu <[email protected]> Cc: Alexei Starovoitov <[email protected]> Cc: Alexei Starovoitov <[email protected]> Cc: Ananth N Mavinakayanahalli <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Paul E . McKenney <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Steven Rostedt <[email protected]> Cc: Thomas Gleixner <[email protected]> Link: http://lkml.kernel.org/r/150701508194.32266.14458959863314097305.stgit@devbox Signed-off-by: Ingo Molnar <[email protected]> --- arch/x86/kernel/kprobes/core.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c index f015371..0742491 100644 --- a/arch/x86/kernel/kprobes/core.c +++ b/arch/x86/kernel/kprobes/core.c @@ -1080,8 +1080,6 @@ int setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs) * raw stack chunk with redzones: */ __memcpy(kcb->jprobes_stack, (kprobe_opcode_t *)addr, MIN_STACK_SIZE(addr)); - regs->flags &= ~X86_EFLAGS_IF; - trace_hardirqs_off(); regs->ip = (unsigned long)(jp->entry); /*
