linux-kernel - [PATCH 0/2 v2] percpu_counter: xfs requires custom compare batch size

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Message-Id: <1431474754-15764-1-git-send-email-david@fromorbit.com>
Date:	Wed, 13 May 2015 09:52:32 +1000
From:	Dave Chinner <david@...morbit.com>
To:	xfs@....sgi.com
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, tj@...nel.org
Subject: [PATCH 0/2 v2] percpu_counter: xfs requires custom compare batch size

Hi folks,

This is v2 of the regression fix for the new generic per-cpu
superblock counter code in XFS. The problems fixed arise from using
custom batch sizes for addition and decrement exceeding the
"accurate compare" bounds in percpu_counter_compare() and hence
resulting in incorrect comparisons being made.

This regression was introduced in 4.1-rc1 and it requires a small
tweak to the percpu counter infrastructure to fix, hence the two
patches.

Comments welcome!

-Dave.
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