linux-kernel - Re: [RFC 02/11] mm: debug: deal with a new family of MM pointers

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Message-ID: <55425BD1.4030009@oracle.com>
Date:	Thu, 30 Apr 2015 12:44:01 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
CC:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	linux-mm@...ck.org
Subject: Re: [RFC 02/11] mm: debug: deal with a new family of MM pointers

On 04/30/2015 12:17 PM, Kirill A. Shutemov wrote:
> On Tue, Apr 14, 2015 at 04:56:24PM -0400, Sasha Levin wrote:
>> > This teaches our printing functions about a new family of MM pointer that it
>> > could now print.
>> > 
>> > I've picked %pZ because %pm and %pM were already taken, so I figured it
>> > doesn't really matter what we go with. We also have the option of stealing
>> > one of those two...
>> > 
>> > Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
>> > ---
>> >  lib/vsprintf.c |   13 +++++++++++++
>> >  1 file changed, 13 insertions(+)
>> > 
>> > diff --git a/lib/vsprintf.c b/lib/vsprintf.c
>> > index 8243e2f..809d19d 100644
>> > --- a/lib/vsprintf.c
>> > +++ b/lib/vsprintf.c
>> > @@ -1375,6 +1375,16 @@ char *comm_name(char *buf, char *end, struct task_struct *tsk,
>> >  	return string(buf, end, name, spec);
>> >  }
>> >  
>> > +static noinline_for_stack
>> > +char *mm_pointer(char *buf, char *end, struct task_struct *tsk,
>> > +		struct printf_spec spec, const char *fmt)
>> > +{
>> > +	switch (fmt[1]) {
> shouldn't we printout at least pointer address for unknown suffixes?

Sure, we can. We can also add a WARN() to make that failure obvious (there's
no reason to use an unrecognised %pZ* format on purpose).


Thanks,
Sasha

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