From: "Jan Beulich" <jbeulich@novell.com>
To: xen-devel@lists.xensource.com
Subject: [PATCH] small adjustment to asm constraints for c/s 19400
Date: Fri, 27 Mar 2009 16:35:50 +0000 [thread overview]
Message-ID: <49CD0E76.76E4.0078.0@novell.com> (raw)
Properly indicate the variable that the asm writes to, and allow
compiler more freedom in selecting a suitable input operand for the ltr
instruction.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
--- 2009-03-27.orig/xen/arch/x86/traps.c 2009-03-24 09:04:02.000000000 +0100
+++ 2009-03-27/xen/arch/x86/traps.c 2009-03-27 10:10:57.000000000 +0100
@@ -3048,8 +3048,8 @@ void load_TR(void)
/* Switch to non-compat GDT (which has B bit clear) to execute LTR. */
asm volatile (
- "sgdt %1; lgdt %2; ltr %%ax; lgdt %1"
- : : "a" (TSS_ENTRY << 3), "m" (old_gdt), "m" (tss_gdt) : "memory" );
+ "sgdt %0; lgdt %2; ltr %w1; lgdt %0"
+ : "=m" (old_gdt) : "rm" (TSS_ENTRY << 3), "m" (tss_gdt) : "memory" );
}
void __devinit percpu_traps_init(void)
next reply other threads:[~2009-03-27 16:35 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-27 16:35 Jan Beulich [this message]
2009-03-30 4:45 ` [PATCH] small adjustment to asm constraints for c/s 19400 Lu, Guanqun
2009-03-30 6:42 ` [PATCH] small adjustment to asm constraints for c/s19400 Jan Beulich
2009-03-30 8:58 ` Lu, Guanqun
2009-03-30 8:45 ` [PATCH] small adjustment to asm constraints for c/s 19400 Keir Fraser
2009-03-30 8:56 ` Lu, Guanqun
2009-03-30 9:13 ` [PATCH] small adjustment to asm constraints for c/s19400 Jan Beulich
2009-03-31 8:54 ` Lu, Guanqun
2009-03-31 9:05 ` Tian, Kevin
2009-03-31 9:24 ` [PATCH] small adjustment to asm constraints forc/s19400 Jan Beulich
2009-03-31 9:26 ` Tian, Kevin
2009-03-31 9:40 ` Jan Beulich
2009-03-31 9:47 ` Tian, Kevin
2009-03-31 10:15 ` Jan Beulich
2009-03-31 10:21 ` Tian, Kevin
2009-03-31 10:54 ` [PATCH] small adjustment to asm constraintsforc/s19400 Jan Beulich
2009-03-31 11:09 ` Tian, Kevin
2009-03-31 11:30 ` Jan Beulich
2009-03-31 11:35 ` Tian, Kevin
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