From: Rolf Eike Beer <eike-kernel@sf-tec.de>
To: linux-parisc <linux-parisc@vger.kernel.org>,
John David Anglin <dave.anglin@bell.net>
Cc: Helge Deller <deller@gmx.de>, Deller <deller@kernel.org>,
James Bottomley <James.Bottomley@hansenpartnership.com>
Subject: Re: [PATCH] parisc: Correct completer in lws start
Date: Tue, 21 Dec 2021 19:29:07 +0100 [thread overview]
Message-ID: <2611217.mvXUDI8C0e@daneel.sf-tec.de> (raw)
In-Reply-To: <44843798-7888-345f-84b6-f961960867fa@bell.net>
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Am Dienstag, 21. Dezember 2021, 19:21:22 CET schrieb John David Anglin:
> Correct completer in lws start.
>
> The completer in the "or,ev %r1,%r30,%r30" instruction is reversed, so we
> are not clipping the LWS number when we are called from a 32-bit process
> (W=0). We need to nulify the depdi instruction when the least-significant
> bit of %r30 is 1.
I'm curious: what effect has this bug? Since this is syscall code I guess it
can somehow be exposed from userspace, but how?
Maybe some sort of explanation like this can even be added to the commit
message?
Eike
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next prev parent reply other threads:[~2021-12-21 18:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-21 18:21 [PATCH] parisc: Correct completer in lws start John David Anglin
2021-12-21 18:29 ` Rolf Eike Beer [this message]
2021-12-21 19:16 ` John David Anglin
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