linux-kernel - Re: [PATCH] drm/i915/pmu: Use local64_try_cmpxchg in i915_pmu_event

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: <87lefw139r.fsf@intel.com>
Date:   Tue, 04 Jul 2023 11:37:04 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Uros Bizjak <ubizjak@...il.com>
Cc:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH] drm/i915/pmu: Use local64_try_cmpxchg in
 i915_pmu_event_read

On Tue, 04 Jul 2023, Uros Bizjak <ubizjak@...il.com> wrote:
> On Tue, Jul 4, 2023 at 9:28 AM Jani Nikula <jani.nikula@...ux.intel.com> wrote:
>> You could save everyone a lot of time by actually documenting what these
>> functions do. Assume you don't know what local64_try_cmpxchg() does, and
>> see how many calls you have to go through to figure it out.
>
> These functions are documented in Documentation/atomic_t.txt (under
> "RMW ops:" section), and the difference is explained in a separate
> section "CMPXCHG vs TRY_CMPXCGS" in the same file.

Thanks, but *sigh*.

No kernel-doc above the functions, not even a regular comment
referencing atomic_t.txt.

$ git grep local.*_try -- Documentation
[nothing]


BR,
Jani.


-- 

"But the plans were on display..."

"On display? I eventually had to go down to the cellar to find them."

"That's the display department."

"With a flashlight."

"Ah, well, the lights had probably gone."

"So had the stairs."

"But look, you found the notice, didn't you?"

"Yes," said Arthur, "yes I did. It was on display in the bottom of a
locked filing cabinet stuck in a disused lavatory with a sign on the
door saying 'Beware of the Leopard'."

- Douglas Adams, The Hitchhiker's Guide to the Galaxy 

-- 
Jani Nikula, Intel Open Source Graphics Center