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| author |   Masami Hiramatsu <mhiramat@kernel.org> | 2017-10-03 16:18:02 +0900 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2017-10-03 19:11:48 +0200 |
| commit | b664d57f39d01e775204d4f1a7e2f8bda77bc549 (patch) | |
| tree | 69bec1f802f6e85fcbbc6ef4fe1a86823c5ab091 /arch/x86 | |
| parent | kprobes/x86: Set up frame pointer in kprobe trampoline (diff) | |
| download | linux-dev-b664d57f39d01e775204d4f1a7e2f8bda77bc549.tar.xz linux-dev-b664d57f39d01e775204d4f1a7e2f8bda77bc549.zip | |
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 <mhiramat@kernel.org>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/150701508194.32266.14458959863314097305.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/kprobes/core.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c index f0153714ddac..0742491cbb73 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); /* |