linux-kernel - Re: [PATCH] asm-generic/mmiowb: Allow mmiowb_set

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Message-Id: <159497652409.524891.6561966096386113237.b4-ty@kernel.org>
Date:   Fri, 17 Jul 2020 11:43:43 +0100
From:   Will Deacon <will@...nel.org>
To:     linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Guo Ren <guoren@...nel.org>, linux-riscv@...ts.infradead.org,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-arch@...r.kernel.org, Palmer Dabbelt <palmer@...belt.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] asm-generic/mmiowb: Allow mmiowb_set_pending() when preemptible()

On Thu, 16 Jul 2020 12:28:16 +0100, Will Deacon wrote:
> Although mmiowb() is concerned only with serialising MMIO writes occuring
> in contexts where a spinlock is held, the call to mmiowb_set_pending()
> from the MMIO write accessors can occur in preemptible contexts, such
> as during driver probe() functions where ordering between CPUs is not
> usually a concern, assuming that the task migration path provides the
> necessary ordering guarantees.
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] asm-generic/mmiowb: Allow mmiowb_set_pending() when preemptible()
      https://git.kernel.org/arm64/c/bd024e82e4cd

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev