From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Gustavo Romero <gromero@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org
Cc: mikey@neuling.org
Subject: Re: [PATCH] selftests/powerpc: Fix earlyclobber in tm-vmxcopy
Date: Sun, 30 Jun 2019 18:37:30 +1000 (AEST) [thread overview]
Message-ID: <45c3lv0rTwz9sND@ozlabs.org> (raw)
In-Reply-To: <1560806698-26651-1-git-send-email-gromero@linux.vnet.ibm.com>
On Mon, 2019-06-17 at 21:24:58 UTC, Gustavo Romero wrote:
> In some cases, compiler can allocate the same register for operand 'res'
> and 'vecoutptr', resulting in segfault at 'stxvd2x 40,0,%[vecoutptr]'
> because base register will contain 1, yielding a false-positive.
>
> This is because output 'res' must be marked as an earlyclobber operand so
> it may not overlap an input operand ('vecoutptr').
>
> Signed-off-by: Gustavo Romero <gromero@linux.vnet.ibm.com>
> Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org>
Applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/8d0f1e05ab16c4bd628ddaefd20b94ffb36d799c
cheers
prev parent reply other threads:[~2019-06-30 8:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-17 21:24 [PATCH] selftests/powerpc: Fix earlyclobber in tm-vmxcopy Gustavo Romero
2019-06-18 12:00 ` Segher Boessenkool
2019-06-30 8:37 ` Michael Ellerman [this message]
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