linux-kernel - Re: [PATCH v2 22/35] percpu-rwsem: enable percpu

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <CAJuCfpEEWFYJehwRhmMAEBx8+gf6TsV=kxuSGDVXaPwhNLt1JQ@mail.gmail.com>
Date:   Mon, 7 Feb 2022 17:31:26 -0800
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Hillf Danton <hdanton@...a.com>
Cc:     Michel Lespinasse <michel@...pinasse.org>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 22/35] percpu-rwsem: enable percpu_sem destruction in
 atomic context

On Mon, Feb 7, 2022 at 4:21 PM Hillf Danton <hdanton@...a.com> wrote:
>
> On Mon, 7 Feb 2022 11:31:38 -0800 Suren Baghdasaryan wrote:
> >
> > Sorry for the delay. Are you concerned about the use of spin_lock()
> > inside percpu_rwsem_async_destroy() which would become a sleeping lock
> > in case of PREEMPT_RT? If so, we can use raw_spin_lock() when locking
> > destroy_list_lock. Please confirm. Thanks!
>
> Yes please replace spin lock with the raw version which can fit in
> more scenarios.

Thanks for confirmation! I'll rework my patch and will send it to
Michel to include in the next version of his patchset.

>
> Hillf
>