linux-kernel - Re: [PATCH 03/24] x86: Do not free zero sized per cpu areas

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Message-ID: <20100326235451.GE29222@cmpxchg.org>
Date:	Sat, 27 Mar 2010 00:54:51 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Ian Campbell <ian.campbell@...rix.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 03/24] x86: Do not free zero sized per cpu areas

On Fri, Mar 26, 2010 at 04:49:10PM -0700, Yinghai Lu wrote:
> On 03/26/2010 04:42 PM, Johannes Weiner wrote:
> > On Fri, Mar 26, 2010 at 03:21:33PM -0700, Yinghai Lu wrote:
> >> From: Ian Campbell <ian.campbell@...rix.com>
> >>
> >> This avoids an infinite loop in free_early_partial().
> >>
> >> Add a warning to free_early_partial to catch future problems.
> >>
> >> -v5: put back start > end back into WARN_ONCE()
> >> -v6: use one line for warning according to linus
> >> -v7: more test by
> >>
> >> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
> >> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> >> Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> >> Tested-by: Joel Becker <joel.becker@...cle.com>
> >> Tested-by: Stanislaw Gruszka <sgruszka@...hat.com>
> >> Cc: Peter Zijlstra <peterz@...radead.org>
> >> Cc: Ingo Molnar <mingo@...e.hu>
> >> ---
> >>  kernel/early_res.c |    6 ++++++
> >>  1 files changed, 6 insertions(+), 0 deletions(-)
> >>
> >> diff --git a/kernel/early_res.c b/kernel/early_res.c
> >> index 3cb2c66..69bed5b 100644
> >> --- a/kernel/early_res.c
> >> +++ b/kernel/early_res.c
> >> @@ -333,6 +333,12 @@ void __init free_early_partial(u64 start, u64 end)
> >>  	struct early_res *r;
> >>  	int i;
> >>  
> >> +	if (start == end)
> >> +		return;
> >> +
> >> +	if (WARN_ONCE(start > end, "free_early_partial: wrong range [%#llx, %#llx]\n", start, end))
> >> +		return;
> > 
> > I think you can drop the function name, it will be in the stack dump
> > anyway.  And that would get the line back into bounds :)
> > 
> > Other than that,
> > Acked-by: Johannes Weiner <hannes@...xchg.org>
> 
> Thanks.
> 
> is there any chance that dump stack only print out address instead of function name ?

I suppose so, lacking frame pointers, but you still have
filename + linenumber + 'wrong range'.
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