linux-kernel - Re: [RFC PATCH 2/2 with seqcount v3] reservation: add suppport for read-only access using rcu

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Date:	Tue, 29 Apr 2014 20:55:19 +0200
From:	Thomas Hellstrom <thellstrom@...are.com>
To:	Maarten Lankhorst <maarten.lankhorst@...onical.com>
CC:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
	ccross@...gle.com, linux-media@...r.kernel.org
Subject: Re: [RFC PATCH 2/2 with seqcount v3] reservation: add suppport for
 read-only access using rcu

On 04/29/2014 04:32 PM, Maarten Lankhorst wrote:
> op 23-04-14 13:15, Maarten Lankhorst schreef:
>> This adds 4 more functions to deal with rcu.
>>
>> reservation_object_get_fences_rcu() will obtain the list of shared
>> and exclusive fences without obtaining the ww_mutex.
>>
>> reservation_object_wait_timeout_rcu() will wait on all fences of the
>> reservation_object, without obtaining the ww_mutex.
>>
>> reservation_object_test_signaled_rcu() will test if all fences of the
>> reservation_object are signaled without using the ww_mutex.
>>
>> reservation_object_get_excl() is added because touching the fence_excl
>> member directly will trigger a sparse warning.
>>
>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@...onical.com>
>> ---
>> Using seqcount and fixing some lockdep bugs.
>> Changes since v2:
>> - Fix some crashes, remove some unneeded barriers when provided by
>> seqcount writes
>> - Fix code to work correctly with sparse's RCU annotations.
>> - Create a global string for the seqcount lock to make lockdep happy.
>>
>> Can I get this version reviewed? If it looks correct I'll mail the
>> full series
>> because it's intertwined with the TTM conversion to use this code.
> Ping, can anyone review this?

Hi, Maarten.
It's on my todo-list. Been away from office for a while.

/Thomas
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