From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Date: Wed, 26 Jan 2011 17:07:27 +0000 (+0000)
Subject: xen/setup: Route halt operations to safe_halt pvop.
X-Git-Tag: upstream/snapshot3+hdmi~11575^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=23febeddbe67e5160929f7c48f7bfe83c2eecb99;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

xen/setup: Route halt operations to safe_halt pvop.

With this patch, the cpuidle driver does not load and
does not issue the mwait operations. Instead the hypervisor
is doing them (b/c we call the safe_halt pvops call).

This fixes quite a lot of bootup issues wherein the user had
to force interrupts for the continuation of the bootup.

Details are discussed in:

http://lists.xensource.com/archives/html/xen-devel/2011-01/msg00535.html

[v2: Wrote the commit description]

Reported-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Tested-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 75bdf2a..a8a66a5 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -355,6 +355,7 @@ void __init xen_arch_setup(void)
 	boot_cpu_data.hlt_works_ok = 1;
 #endif
 	pm_idle = default_idle;
+	boot_option_idle_override = IDLE_HALT;
 
 	fiddle_vdso();
 }