[patch] delete sync.i in ia64_switch_to()

From: Chen, Kenneth W <kenneth.w.chen_at_intel.com>
Date: 2005-09-07 17:22:29
The sync.i instruction in ia64_switch_to() context switch code
looks like an old leftover code.  sync.i instruction supposedly
ensures flush cache operation issued by processor become visible
to memory reference.  Everywhere I looked where fc instruction is
used (ia64_fc), a sync.i is always accompanied.  Everywhere in
the vicinity of context switch (save_switch_stack/load_switch_stack)
don't have any fc instruction in there.  I don't see any reason why
we need to issue sync.i in context switch code.  Patch to remove it.

Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>


--- ./arch/ia64/kernel/entry.S.orig	2005-09-06 22:36:17.114182129 -0700
+++ ./arch/ia64/kernel/entry.S	2005-09-07 00:20:37.216644505 -0700
@@ -213,10 +213,6 @@ GLOBAL_ENTRY(ia64_switch_to)
 	mov r13=in0			// set "current" pointer
 	;;
 	DO_LOAD_SWITCH_STACK
-
-#ifdef CONFIG_SMP
-	sync.i				// ensure "fc"s done by this CPU are visible on other CPUs
-#endif
 	br.ret.sptk.many rp		// boogie on out in new context
 
 .map:


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Received on Wed Sep 07 17:23:47 2005

This archive was generated by hypermail 2.1.8 : 2005-09-07 17:23:53 EST