linux-kernel - Re: [PATCH 0/6] clk: meson: Delete a meaningless spinlock from the MPLL

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <1j34lpzbxr.fsf@starbuckisacylon.baylibre.com>
Date: Tue, 24 Sep 2024 10:35:28 +0200
From: Jerome Brunet <jbrunet@...libre.com>
To: Chuan Liu via B4 Relay <devnull+chuan.liu.amlogic.com@...nel.org>
Cc: Neil Armstrong <neil.armstrong@...aro.org>,  Michael Turquette
 <mturquette@...libre.com>,  Stephen Boyd <sboyd@...nel.org>,  Kevin Hilman
 <khilman@...libre.com>,  Martin Blumenstingl
 <martin.blumenstingl@...glemail.com>,  chuan.liu@...ogic.com,
  linux-amlogic@...ts.infradead.org,  linux-clk@...r.kernel.org,
  linux-arm-kernel@...ts.infradead.org,  linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] clk: meson: Delete a meaningless spinlock from the
 MPLL

On Fri 20 Sep 2024 at 16:16, Chuan Liu via B4 Relay <devnull+chuan.liu.amlogic.com@...nel.org> wrote:

> The existing locking mechanism of CCF can effectively avoid concurrent
> register access. struct meson_clk_mpll_data has no meaning in defining
> a spinlock repeatedly.
>
> In addition, the register corresponding to MPLL does not share the same
> register with other module drivers, so there is no concurrent access to
> the register with other modules drivers.
>
> Every driver file with mpll defines a spinlock with the same name (even
> if defined as "static"), giving the illusion of repeated definitions?
>
> Signed-off-by: Chuan Liu <chuan.liu@...ogic.com>

I'm ok with the patch in general but I have problem with the wording.
The lock is not meaningless. It has a meaning but it does not serve a
purpose, at least not anymore. You could write that it is useless, or
superfluous if you want to, but not meaningless.

Also, please squash the changes. 1 patch for this is fine.

> ---
> Chuan Liu (6):
>       clk: meson: mpll: Delete a meaningless spinlock from the MPLL
>       clk: meson: axg: Delete the spinlock from the MPLL
>       clk: meson: meson8b: Delete the spinlock from the MPLL
>       clk: meson: gxbb: Delete the spinlock from the MPLL
>       clk: meson: g12a: Delete the spinlock from the MPLL
>       clk: meson: s4: Delete the spinlock from the MPLL
>
>  drivers/clk/meson/axg.c      |  6 ------
>  drivers/clk/meson/clk-mpll.c | 11 -----------
>  drivers/clk/meson/clk-mpll.h |  1 -
>  drivers/clk/meson/g12a.c     |  6 ------
>  drivers/clk/meson/gxbb.c     |  6 ------
>  drivers/clk/meson/meson8b.c  |  3 ---
>  drivers/clk/meson/s4-pll.c   |  6 ------
>  7 files changed, 39 deletions(-)
> ---
> base-commit: 0ef513560b53d499c824b77220c537eafe1df90d
> change-id: 20240918-mpll_spinlock-4b9b55c44fd5
>
> Best regards,

-- 
Jerome