Date: Fri, 29 Mar 2019 18:37:23 +0100 From: Oleg Nesterov <oleg@...hat.com> To: Joel Fernandes <joel@...lfernandes.org> Cc: Jann Horn <jannh@...gle.com>, Kees Cook <keescook@...omium.org>, "Eric W. Biederman" <ebiederm@...ssion.com>, LKML <linux-kernel@...r.kernel.org>, Android Kernel Team <kernel-team@...roid.com>, Kernel Hardening <kernel-hardening@...ts.openwall.com>, Andrew Morton <akpm@...ux-foundation.org>, Matthew Wilcox <willy@...radead.org>, Michal Hocko <mhocko@...e.com>, "Reshetova, Elena" <elena.reshetova@...el.com> Subject: Re: [PATCH] Convert struct pid count to refcount_t On 03/28, Joel Fernandes wrote: > > Also Oleg, why not just call refcount_dec_and_test like below? Of course we can, this is just optimization to avoid the atomic op if possible. Does this optimization really help? I have no idea ;) But as you can see, it surely helps to provoke the interesting discussions! Oleg.
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