linux-kernel - [PATCH -tip v2] x86/alternatives: Fix build warning

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Date:	Fri, 05 Feb 2010 12:16:47 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>
Cc:	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: [PATCH -tip v2] x86/alternatives: Fix build warning

Fixes below warnings.

====
FYI, there's this new build warning on x86 defconfig:

arch/x86/kernel/alternative.c: In function 'alternatives_text_reserved':
arch/x86/kernel/alternative.c:402: warning: comparison of distinct pointer types lacks a cast
arch/x86/kernel/alternative.c:402: warning: comparison of distinct pointer types lacks a cast
arch/x86/kernel/alternative.c:405: warning: comparison of distinct pointer types lacks a cast
arch/x86/kernel/alternative.c:405: warning: comparison of distinct pointer types lacks a cast

Caused by:

2cfa197: ftrace/alternatives: Introducing *_text_reserved functions
====

Changes in v2:
 - Use local variables to compare, instead of type casts.

Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
Reported-by: Ingo Molnar <mingo@...e.hu>
---

 arch/x86/kernel/alternative.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 3832fdc..e6ea034 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -397,12 +397,14 @@ int alternatives_text_reserved(void *start, void *end)
 {
 	struct smp_alt_module *mod;
 	u8 **ptr;
+	u8 *text_start = start;
+	u8 *text_end = end;
 
 	list_for_each_entry(mod, &smp_alt_modules, next) {
-		if (mod->text > end || mod->text_end < start)
+		if (mod->text > text_end || mod->text_end < text_start)
 			continue;
 		for (ptr = mod->locks; ptr < mod->locks_end; ptr++)
-			if (start <= *ptr && end >= *ptr)
+			if (text_start <= *ptr && text_end >= *ptr)
 				return 1;
 	}
 


-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com
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