From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Tue, 3 Dec 2013 08:54:12 +0000 (+0100)
Subject: x86: be more power-efficient when waiting forever
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~5822^2~10
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=a5ca03ea2f48ceedd835ba938999dc9c5e6a4690;p=xen.git

x86: be more power-efficient when waiting forever

The effect is unchanged, but the processor will be spending most of its time
in the C1 or C1E power state rather than C0.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Keir Fraser <keir@xen.org>
---

diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index d8b3eac15a..8c355e547c 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -1448,7 +1448,8 @@ void __init do_early_page_fault(struct cpu_user_regs *regs)
         printk("Stack dump: ");
         while ( ((long)stk & ((PAGE_SIZE - 1) & ~(BYTES_PER_LONG - 1))) != 0 )
             printk("%p ", _p(*stk++));
-        for ( ; ; ) ;
+        for ( ; ; )
+            halt();
     }
 }