Is perf_sigtrap synchronous?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



I am looking at perf_sigtrap and I am confused by the code.


	/*
	 * We'd expect this to only occur if the irq_work is delayed and either
	 * ctx->task or current has changed in the meantime. This can be the
	 * case on architectures that do not implement arch_irq_work_raise().
	 */
	if (WARN_ON_ONCE(event->ctx->task != current))
		return;

	/*
	 * perf_pending_event() can race with the task exiting.
	 */
	if (current->flags & PF_EXITING)
		return;


It performs tests that absolutely can never fail if we are talking about
a synchronous exception.  The code force_sig family of functions only
make sense to use with and are only safe to use with synchronous
exceptions.

Are the tests in perf_sigtrap necessary or is perf_sigtrap not reporting
a synchronous event?

Eric



[Index of Archives]     [Linux Kernel]     [Kernel Newbies]     [x86 Platform Driver]     [Netdev]     [Linux Wireless]     [Netfilter]     [Bugtraq]     [Linux Filesystems]     [Yosemite Discussion]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Device Mapper]

  Powered by Linux