linux-kernel - Re: linux-next: build warning after merge of the tip tree

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Date:	Fri, 3 Sep 2010 17:04:07 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Haicheng Li <haicheng.li@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: linux-next: build warning after merge of the tip tree

On Fri, Sep 03, 2010 at 10:12:01AM +0800, Stephen Rothwell wrote:
> On Fri, 3 Sep 2010 12:10:23 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> >
> > After merging the tip tree, today's linux-next build (x86_64 allmodconfig)
> > produced this warning:
> > 
> > arch/x86/mm/init_64.c: In function 'kernel_physical_mapping_init':
> > arch/x86/mm/init_64.c:601: warning: 'addr' may be used uninitialized in this function
> > 
> > The code does look suspicious ... 'addr' gets declared and then passed to
> > a function, but is not set anywhere ...
> 
> Forgot to say:
> 
> Introduced by commit 9b861528a8012e7bc4d1f7bae07395b225331477 ("x86-64,
> mem: Update all PGDs for direct mapping and vmemmap mapping changes").


The original patch has the following line, however get lost some time
later:

        http://www.spinics.net/lists/linux-mm/msg08152.html

===
x86, mm: fix uninitialized addr in kernel_physical_mapping_init()

This re-adds the lost chunk in commit 9b861528a80.

CC: Haicheng Li <haicheng.li@...ux.intel.com>
Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
---
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 64e7bc2..74f0f35 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -570,6 +570,7 @@ kernel_physical_mapping_init(unsigned long start,
 
 	start = (unsigned long)__va(start);
 	end = (unsigned long)__va(end);
+	addr = start;
 
 	for (; start < end; start = next) {
 		pgd_t *pgd = pgd_offset_k(start);
--
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