linux-kernel - [patch] i386: remove IOPL check on task switch

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Message-ID: <200611030130_MC3-1-D02A-DEB@compuserve.com>
Date:	Fri, 3 Nov 2006 01:27:37 -0500
From:	Chuck Ebbert <76306.1226@...puserve.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Linus Torvalds <torvalds@...l.org>, Andrew Morton <akpm@...l.org>,
	Zachary Amsden <zach@...are.com>, Andi Kleen <ak@...e.de>
Subject: [patch] i386: remove IOPL check on task switch

IOPL is implicitly saved and restored on task switch,
so explicit check is no longer needed.

Signed-off-by: Chuck Ebbert <76306.1226@...puserve.com>

--- 2.6.19-rc4-32smp.orig/arch/i386/kernel/process.c
+++ 2.6.19-rc4-32smp/arch/i386/kernel/process.c
@@ -681,12 +681,6 @@ struct task_struct fastcall * __switch_t
 		loadsegment(gs, next->gs);
 
 	/*
-	 * Restore IOPL if needed.
-	 */
-	if (unlikely(prev->iopl != next->iopl))
-		set_iopl_mask(next->iopl);
-
-	/*
 	 * Now maybe handle debug registers and/or IO bitmaps
 	 */
 	if (unlikely((task_thread_info(next_p)->flags & _TIF_WORK_CTXSW)
-- 
Chuck
"Even supernovas have their duller moments."
-
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