On Thursday 05 May 2016 08:16:47 Vineet Gupta wrote:
> Thx for noticing this Arnd and the heads up. Does the patch below look ok to you ?
>
> ----------->
> rom b7e719831c389ab4fa338b2e2e7c0d1ff90dabb0 Mon Sep 17 00:00:00 2001
> From: Vineet Gupta <vgupta@xxxxxxxxxxxx>
> Date: Thu, 5 May 2016 13:32:34 +0530
> Subject: [PATCH] ARC: Add missing io barriers to io{read,write}{16,32}be()
>
> While reviewing a different change to asm-generic/io.h Arnd spotted that
> ARC ioread32 and ioread32be both of which come from asm-generic versions
> are not symmetrical in terms of calling the io barriers.
>
> generic ioread32 -> ARC readl() [ has barriers]
> generic ioread32be -> __be32_to_cpu(__raw_readl()) [ lacks barriers]
>
> While generic ioread32be is being remediated to call readl(), that involves
> a swab32(), causing double swaps on ioread32be() on Big Endian systems.
>
> So provide our versions of big endian IO accessors to ensure io barrier
> calls while also keeping them optimal
>
> Suggested-by: Arnd Bergmann <arnd@xxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx [4.2+]
> Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Yes, that looks correct. We probably want this regardless of the change
I proposed for the generic file, to avoid the double swap.
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
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