linux-kernel - Re: [PATCH v3 1/2] powerpc/set_memory: Avoid spinlock recursion in change_page

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Message-Id: <164501434734.521186.493750224564400396.b4-ty@ellerman.id.au>
Date:   Wed, 16 Feb 2022 23:25:47 +1100
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, Russell Currey <ruscur@...sell.cc>,
        Maxime Bizon <mbizon@...ebox.fr>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] powerpc/set_memory: Avoid spinlock recursion in change_page_attr()

On Fri, 24 Dec 2021 11:07:33 +0000, Christophe Leroy wrote:
> Commit 1f9ad21c3b38 ("powerpc/mm: Implement set_memory() routines")
> included a spin_lock() to change_page_attr() in order to
> safely perform the three step operations. But then
> commit 9f7853d7609d ("powerpc/mm: Fix set_memory_*() against
> concurrent accesses") modify it to use pte_update() and do
> the operation safely against concurrent access.
> 
> [...]

Applied to powerpc/next.

[1/2] powerpc/set_memory: Avoid spinlock recursion in change_page_attr()
      https://git.kernel.org/powerpc/c/a4c182ecf33584b9b2d1aa9dad073014a504c01f
[2/2] powerpc: Add set_memory_{p/np}() and remove set_memory_attr()
      https://git.kernel.org/powerpc/c/f222ab83df92acf72691a2021e1f0d99880dcdf1

cheers