From: Keith Owens <kaos@sgi.com>
Date: Fri, 1 Jul 2005 05:53:00 +0000 (-0700)
Subject: [IA64] restore_sigcontext is not preempt safe
X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=2ba3e3e65cf182436757ba13ea8d564e2950fb56;p=linux-edison.git

[IA64] restore_sigcontext is not preempt safe

restore_sigcontext calls ia64_set_local_fpu_owner() which requires that
preempt be disabled.

Signed-off-by: Keith Owens <kaos@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
---

diff --git a/arch/ia64/kernel/signal.c b/arch/ia64/kernel/signal.c
index edd9f07860b..b8a0a7d257a 100644
--- a/arch/ia64/kernel/signal.c
+++ b/arch/ia64/kernel/signal.c
@@ -143,6 +143,7 @@ restore_sigcontext (struct sigcontext __user *sc, struct sigscratch *scr)
 
 		__copy_from_user(current->thread.fph, &sc->sc_fr[32], 96*16);
 		psr->mfh = 0;	/* drop signal handler's fph contents... */
+		preempt_disable();
 		if (psr->dfh)
 			ia64_drop_fpu(current);
 		else {
@@ -150,6 +151,7 @@ restore_sigcontext (struct sigcontext __user *sc, struct sigscratch *scr)
 			__ia64_load_fpu(current->thread.fph);
 			ia64_set_local_fpu_owner(current);
 		}
+		preempt_enable();
 	}
 	return err;
 }