From: Josef Bacik Date: Fri, 30 Aug 2013 14:05:22 +0000 (-0400) Subject: rwsem: add rwsem_is_contended X-Git-Tag: v3.14-rc1~29^2~70 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4a444b1f06d259ce938a47048840260f71a91c84;p=pandora-kernel.git rwsem: add rwsem_is_contended Btrfs needs a simple way to know if it needs to let go of it's read lock on a rwsem. Introduce rwsem_is_contended to check to see if there are any waiters on this rwsem currently. This is just a hueristic, it is meant to be light and not 100% accurate and called by somebody already holding on to the rwsem in either read or write. Thanks, Signed-off-by: Josef Bacik Signed-off-by: Chris Mason Acked-by: Ingo Molnar --- Reading git-diff-tree failed