linux-kernel - Re: [PATCH v5 2/7] mutex: add support for wound/wait style locks, v5

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Date:	Thu, 20 Jun 2013 13:55:32 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Maarten Lankhorst <maarten.lankhorst@...onical.com>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	peterz@...radead.org, x86@...nel.org,
	dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
	robclark@...il.com, rostedt@...dmis.org, daniel@...ll.ch,
	tglx@...utronix.de, linux-media@...r.kernel.org
Subject: Re: [PATCH v5 2/7] mutex: add support for wound/wait style locks, v5


* Maarten Lankhorst <maarten.lankhorst@...onical.com> wrote:

> Changes since RFC patch v1:
>  - Updated to use atomic_long instead of atomic, since the reservation_id was a long.
>  - added mutex_reserve_lock_slow and mutex_reserve_lock_intr_slow
>  - removed mutex_locked_set_reservation_id (or w/e it was called)
> Changes since RFC patch v2:
>  - remove use of __mutex_lock_retval_arg, add warnings when using wrong combination of
>    mutex_(,reserve_)lock/unlock.
> Changes since v1:
>  - Add __always_inline to __mutex_lock_common, otherwise reservation paths can be
>    triggered from normal locks, because __builtin_constant_p might evaluate to false
>    for the constant 0 in that case. Tests for this have been added in the next patch.
>  - Updated documentation slightly.
> Changes since v2:
>  - Renamed everything to ww_mutex. (mlankhorst)
>  - Added ww_acquire_ctx and ww_class. (mlankhorst)
>  - Added a lot of checks for wrong api usage. (mlankhorst)
>  - Documentation updates. (danvet)
> Changes since v3:
>  - Small documentation fixes (robclark)
>  - Memory barrier fix (danvet)
> Changes since v4:
>  - Remove ww_mutex_unlock_single and ww_mutex_lock_single.
>  - Rename ww_mutex_trylock_single to ww_mutex_trylock.
>  - Remove separate implementations of ww_mutex_lock_slow*, normal
>    functions can be used. Inline versions still exist for extra
>    debugging.
>  - Cleanup unneeded memory barriers, add comment to the remaining
>    smp_mb().

That's not a proper changelog. It should be a short description of what it 
does, possibly referring to the new Documentation/ww-mutex-design.txt file 
for more details.

> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@...onical.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
> Signed-off-by: Rob Clark <robdclark@...il.com>

That's not a valid signoff chain: the last signoff in the chain is the 
person sending me the patch. The first signoff is the person who wrote the 
patch. The other two gents should be Acked-by I suspect?

Thanks,

	Ingo
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