* [PATCH] pstore/core: drop cmpxchg based updates
[not found] <20160824130935.23110-1-bigeasy@linutronix.de>
@ 2016-09-08 10:23 ` Rabin Vincent
0 siblings, 0 replies; only message in thread
From: Rabin Vincent @ 2016-09-08 10:23 UTC (permalink / raw)
To: linux-arm-kernel
On Wed, Aug 24, 2016 at 03:09:35PM +0200, Sebastian Andrzej Siewior wrote:
> I have here a FPGA behind PCIe which exports SRAM which I use for
> pstore. Now it seems that the FPGA no longer supports cmpxchg based
> updates and writes back 0xff?ff and returns the same. This leads to
> crash during crash rendering pstore useless.
> Since I doubt that there is much benefit from using cmpxchg() here, I am
> dropping this atomic access and use the spinlock based version.
>
> Cc: Anton Vorontsov <anton@enomsg.org>
> Cc: Colin Cross <ccross@android.com>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Tony Luck <tony.luck@intel.com>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Rabin Vincent <rabinv@axis.com>
This patch is needed for pstore to work on (most?) ARMv7 chips. See
this thread for details:
https://lkml.kernel.org/g/CABXOdTfT7xMfiBvRuUS1hsVs=q5q2wY1x1Z8oCyyJNFckM0g0A at mail.gmail.com
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2016-09-08 10:23 ` [PATCH] pstore/core: drop cmpxchg based updates Rabin Vincent
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