Re: [PATCH] ARC: unbork 5.11 bootup: fix snafu in _TIF_NOTIFY_SIGNAL handling

From: Jens Axboe
Date: Wed Jan 06 2021 - 21:14:03 EST


On 1/6/21 5:12 PM, Vineet Gupta wrote:
> Linux 5.11.rcX was failing to boot on ARC HSDK board. Turns out we have
> a couple of issues, this being the first one, and I'm to blame as I
> didn't pay attention during review.
>
> TIF_NOTIFY_SIGNAL support requires checking multiple TIF_* bits in
> kernel return code path. Old code only needed to check a single bit so
> BBIT0 <TIF_SIGPENDING> worked. New code needs to check multiple bits so
> AND <bit-mask> instruction. So needs to use bit mask variant _TIF_SIGPENDING

Sorry about that, my arc asm isn't that strong :-)
Thanks for fixing it.

--
Jens Axboe