From: Samuel Thibault <samuel.thibault@labri.fr>
Date: Sat, 21 May 2005 15:50:15 +0000 (+0200)
Subject: [PATCH] spin_unlock_bh() and preempt_check_resched()
X-Git-Tag: v2.6.12-rc5~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=10f02d1c59e55f529140dda3a92f0099d748451c;p=pandora-kernel.git

[PATCH] spin_unlock_bh() and preempt_check_resched()

In _spin_unlock_bh(lock):
	do { \
		_raw_spin_unlock(lock); \
		preempt_enable(); \
		local_bh_enable(); \
		__release(lock); \
	} while (0)

there is no reason for using preempt_enable() instead of a simple
preempt_enable_no_resched()

Since we know bottom halves are disabled, preempt_schedule() will always
return at once (preempt_count!=0), and hence preempt_check_resched() is
useless here...

This fixes it by using "preempt_enable_no_resched()" instead of the
"preempt_enable()", and thus avoids the useless preempt_check_resched()
just before re-enabling bottom halves.

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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