From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julia Lawall <julia.lawall@lip6.fr>
Date: Mon, 05 Jan 2015 22:01:55 +0000
Subject: Re: [PATCH 1/8] fs/9p: Deletion of unnecessary checks before the function call "p9_client_clunk"
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References: <alpine.DEB.2.10.1402251014170.2080@hadrien> <530CD2C4.4050903@users.sourceforge.net> <alpine.DEB.2.10.1402251840450.7035@hadrien> <530CF8FF.8080600@users.sourceforge.net> <alpine.DEB.2.02.1402252117150.2047@localhost6.localdomain6>
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To: SF Markus Elfring <elfring@users.sourceforge.net>
Cc: Julia Lawall <julia.lawall@lip6.fr>, Dan Carpenter <dan.carpenter@oracle.com>, Eric Van Hensbergen <ericvh@gmail.com>, Latchesar Ionkov <lucho@ionkov.net>, Ron Minnich <rminnich@sandia.gov>, v9fs-developer@lists.sourceforge.net, LKML <linux-kernel@vger.kernel.org>, kernel-janitors@vger.kernel.org

> The error response is clear. Are any software developments efforts expected
> to clean-up the call stack for unwanted null pointers even more?

I found the original patch and looked at the call sites.  None of them 
calls dump_stack.  The behavior is thus not the same.  With your change, 
something that was previously treated in an orderly manner will be 
converted to something that looks like an oops.  I assume that the cost of 
the dump_stack will also be huge.

julia