linux-kernel - [tip:x86/urgent] x86/apic: Avoid wrong warning when parsing 'apic=' in X86-32 case

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Message-ID: <tip-4fcab6693445cfb84f2b65868c58043535090e52@git.kernel.org>
Date:   Thu, 28 Dec 2017 03:36:44 -0800
From:   tip-bot for Dou Liyang <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, hpa@...or.com, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, douly.fnst@...fujitsu.com
Subject: [tip:x86/urgent] x86/apic: Avoid wrong warning when parsing 'apic='
 in X86-32 case

Commit-ID:  4fcab6693445cfb84f2b65868c58043535090e52
Gitweb:     https://git.kernel.org/tip/4fcab6693445cfb84f2b65868c58043535090e52
Author:     Dou Liyang <douly.fnst@...fujitsu.com>
AuthorDate: Mon, 4 Dec 2017 12:03:12 +0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 28 Dec 2017 12:32:06 +0100

x86/apic: Avoid wrong warning when parsing 'apic=' in X86-32 case

There are two consumers of apic=:
  apic_set_verbosity() for setting the APIC debug level;
  parse_apic() for registering APIC driver by hand.

X86-32 supports both of them, but sometimes, kernel issues a weird warning.
eg: when kernel was booted up with 'apic=bigsmp' in command line,
early_param would warn like that:

...
[    0.000000] APIC Verbosity level bigsmp not recognised use apic=verbose or apic=debug
[    0.000000] Malformed early option 'apic'
...

Wrap the warning code in CONFIG_X86_64 case to avoid this.

Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: peterz@...radead.org
Cc: rdunlap@...radead.org
Cc: corbet@....net
Link: https://lkml.kernel.org/r/20171204040313.24824-1-douly.fnst@cn.fujitsu.com

---
 arch/x86/kernel/apic/apic.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 6e272f3..880441f 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2626,11 +2626,13 @@ static int __init apic_set_verbosity(char *arg)
 		apic_verbosity = APIC_DEBUG;
 	else if (strcmp("verbose", arg) == 0)
 		apic_verbosity = APIC_VERBOSE;
+#ifdef CONFIG_X86_64
 	else {
 		pr_warning("APIC Verbosity level %s not recognised"
 			" use apic=verbose or apic=debug\n", arg);
 		return -EINVAL;
 	}
+#endif
 
 	return 0;
 }