Messages in this thread | | | Date | Thu, 13 Jul 2006 23:27:27 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] TIF_NOTSC and SECCOMP prctl |
| |
On Fri, 14 Jul 2006 08:09:32 +0200 andrea@cpushare.com wrote:
> The only thing left worth discussing is why if I set TIF_NOTSC to 10 > instead of 19 the kernel was crashing hard... After I checked and > rechecked everything else I deduced it had to be that number and after > changing it to 19 everything works fine... I also verified the first > rdtsc kills the task with a sigsegv. It would be nice to make sure > it's not a bug in the below patch that 10 didn't work but just some > hidden kernel "feature" ;).
Using a bit <= 15 will cause kernel to take the work_notifysig path "pending work-to-be-done flags are in LSW". I'm not sure what happens if there's such a flag set but nothing is set up to handle it. I guess it stays set and processes never get out of the kernel again.
Perhaps TIF_SECCOMP should be >= 16 too - the special-case in _TIF_ALLWORK_MASK looks odd.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |