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Message-ID: <20161128124846.GL3174@twins.programming.kicks-ass.net>
Date: Mon, 28 Nov 2016 13:48:46 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: "Reshetova, Elena" <elena.reshetova@...el.com>
Cc: "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>,
Greg KH <gregkh@...uxfoundation.org>,
Kees Cook <keescook@...omium.org>,
"will.deacon@....com" <will.deacon@....com>,
Boqun Feng <boqun.feng@...il.com>,
Hans Liljestrand <ishkamiel@...il.com>,
David Windsor <dwindsor@...il.com>, aik@...abs.ru,
david@...son.dropbear.id.au
Subject: Re: Conversion from atomic_t to refcount_t: summary of issues
On Mon, Nov 28, 2016 at 01:13:47PM +0100, Peter Zijlstra wrote:
>
> > - if (atomic_add_unless(&inode->i_count, -1, 1)) (typical for fs and other code)
>
Many instances are variants of dec_and_lock/dec_and_mutex_lock(), like
for example the one in put_css_set().
However, there are a few, like in super.c and in XFS that are more
complex, but I have too much of a head-ache to actually think about that
atm.
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