From: Robert Love <rml@tech9.net>
To: akpm@digeo.com, torvalds@transmeta.com
Cc: linux-kernel@vger.kernel.org
Subject: [patch] kernel_flag is not needed on UP+preempt
Date: 12 Feb 2003 01:29:00 -0500 [thread overview]
Message-ID: <1045031340.786.89.camel@phantasy> (raw)
There is no reason to define and declare the actual kernel_flag spinlock
on UP systems, even if kernel preemption is enabled.
Preempt needs to use the lock_kernel() calls, but it does not need the
actual lock to exist.
So change the check from SMP || PREEMPT to just SMP. Tests fine. Patch
is against 2.5.60.
Robert Love
kernel/sched.c | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)
diff -urN linux-2.5.60-mm1/kernel/sched.c linux/kernel/sched.c
--- linux-2.5.60-mm1/kernel/sched.c 2003-02-12 00:28:51.788915192 -0500
+++ linux/kernel/sched.c 2003-02-12 00:29:10.539064736 -0500
@@ -2644,7 +2644,7 @@
#endif
-#if CONFIG_SMP || CONFIG_PREEMPT
+#if CONFIG_SMP
/*
* The 'big kernel lock'
*
reply other threads:[~2003-02-12 6:19 UTC|newest]
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