linux-kernel - [tip:x86/platform] x86/platform/UV: Ensure uv_system

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Message-ID: <tip-9ec808a0225aabab59fb2932b70784b087ac0f58@git.kernel.org>
Date:   Wed, 1 Feb 2017 02:12:24 -0800
From:   "tip-bot for travis@....com" <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, hpa@...or.com, linux-kernel@...r.kernel.org,
        travis@....com, sivanich@....com, peterz@...radead.org,
        mingo@...nel.org, rja@....com, torvalds@...ux-foundation.org
Subject: [tip:x86/platform] x86/platform/UV: Ensure uv_system_init is called
 when necessary

Commit-ID:  9ec808a0225aabab59fb2932b70784b087ac0f58
Gitweb:     http://git.kernel.org/tip/9ec808a0225aabab59fb2932b70784b087ac0f58
Author:     travis@....com <travis@....com>
AuthorDate: Wed, 25 Jan 2017 10:35:23 -0600
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 1 Feb 2017 10:21:00 +0100

x86/platform/UV: Ensure uv_system_init is called when necessary

Move the check to whether this is a UV system that needs initialization
from is_uv_system() to the internal uv_system_init() function.  This is
because on a UV system without a HUB the is_uv_system() returns false.
But we still need some specific UV system initialization.  See the
uv_system_init() for change to a quick check if UV is applicable. This
change should not increase overhead since is_uv_system() also called
into this same area.

Signed-off-by: Mike Travis <travis@....com>
Reviewed-by: Russ Anderson <rja@....com>
Acked-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Dimitri Sivanich <sivanich@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20170125163518.256403963@asylum.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/smpboot.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 46732dc..386c7f7 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1341,8 +1341,7 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
 	pr_info("CPU0: ");
 	print_cpu_info(&cpu_data(0));
 
-	if (is_uv_system())
-		uv_system_init();
+	uv_system_init();
 
 	set_mtrr_aps_delayed_init();