From: Yinghai Lu <yinghai@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
"H. Peter Anvin" <hpa@zytor.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH 5/5] x86, x2apic: Don't map lapic addr for preenabled x2apic system
Date: Tue, 07 Dec 2010 00:55:56 -0800 [thread overview]
Message-ID: <4CFDF69C.9070501@kernel.org> (raw)
In-Reply-To: <4CFDF544.8020309@kernel.org>
If x2apic is reenabled, and used in kernel, We don't need to map that lapic
address. That mapping will never be used.
So just skip that in register_lapic_address()
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
arch/x86/kernel/apic/apic.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
Index: linux-2.6/arch/x86/kernel/apic/apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/apic.c
+++ linux-2.6/arch/x86/kernel/apic/apic.c
@@ -1676,9 +1676,11 @@ void __init register_lapic_address(unsig
{
mp_lapic_addr = address;
- set_fixmap_nocache(FIX_APIC_BASE, address);
- apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
- APIC_BASE, mp_lapic_addr);
+ if (!x2apic_mode) {
+ set_fixmap_nocache(FIX_APIC_BASE, address);
+ apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
+ APIC_BASE, mp_lapic_addr);
+ }
if (boot_cpu_physical_apicid == -1U) {
boot_cpu_physical_apicid = read_apic_id();
apic_version[boot_cpu_physical_apicid] =
next prev parent reply other threads:[~2010-12-07 8:56 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4CFDF544.8020309@kernel.org>
2010-12-07 8:55 ` [PATCH 1/5] x86, apic: Merge two register_lapic_address() Yinghai Lu
2010-12-09 20:54 ` [tip:x86/apic-cleanups] x86, apic: Unify identical register_lapic_address() functions tip-bot for Yinghai Lu
2010-12-07 8:55 ` [PATCH 2/5] x86, apic: Remove early_init_lapic_mapping Yinghai Lu
2010-12-09 20:55 ` [tip:x86/apic-cleanups] x86, apic: Remove early_init_lapic_mapping() tip-bot for Yinghai Lu
2010-12-07 8:55 ` [PATCH 3/5] x86, apic: Use register_lapic_address in init_apic_mapping Yinghai Lu
2010-12-09 20:55 ` [tip:x86/apic-cleanups] x86, apic: Use register_lapic_address() in init_apic_mapping() tip-bot for Yinghai Lu
2010-12-07 8:55 ` [PATCH 4/5] x86, sfi: Use register_lapic_address() Yinghai Lu
2010-12-09 20:55 ` [tip:x86/apic-cleanups] " tip-bot for Yinghai Lu
2010-12-07 8:55 ` Yinghai Lu [this message]
2010-12-09 20:56 ` [tip:x86/apic-cleanups] x86, x2apic: Don't map lapic addr for preenabled x2apic systems tip-bot for Yinghai Lu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4CFDF69C.9070501@kernel.org \
--to=yinghai@kernel.org \
--cc=ebiederm@xmission.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=suresh.b.siddha@intel.com \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox