linux-kernel - Re: [PATCH] ARC: unbork 5.11 bootup: fix snafu in _TIF_NOTIFY

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Date:   Wed, 6 Jan 2021 19:13:03 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        linux-snps-arc@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARC: unbork 5.11 bootup: fix snafu in _TIF_NOTIFY_SIGNAL
 handling

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