linux-kernel - Re: [PATCH] powerpc/code-patching: Perform hwsync in __patch

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Message-Id: <169840079684.2701453.17093858702248932899.b4-ty@ellerman.id.au>
Date:   Fri, 27 Oct 2023 20:59:56 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Hari Bathini <hbathini@...ux.ibm.com>,
        "Christopher M . Riedl" <cmr@...escreens.de>
Subject: Re: [PATCH] powerpc/code-patching: Perform hwsync in __patch_instruction() in case of failure

On Sat, 07 Oct 2023 12:46:19 +0200, Christophe Leroy wrote:
> Commit c28c15b6d28a ("powerpc/code-patching: Use temporary mm for
> Radix MMU") added a hwsync for when __patch_instruction() fails,
> we results in a quite odd unbalanced logic.
> 
> Instead of calling mb() when __patch_instruction() returns an error,
> call mb() in the __patch_instruction()'s error path directly.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/code-patching: Perform hwsync in __patch_instruction() in case of failure
      https://git.kernel.org/powerpc/c/74726fda9fe306f848088ef73ec266cae0470d5b

cheers