age
Subject: Re: [PATCH 1/9] dma-buf: add new dma_fence_chain container v6
From: Christian König
To: "Zhou, David(ChunMing)" ,kbuild test robot ,"Zhou, David(ChunMing)"
CC:
kbuild-...@01.org,dri-devel@lists.freedesktop.org,amd-...@lists.freedesktop.org,lionel.g.landwer...@intel.c
silences the warning.
Christian.
Am 21.03.19 um 15:13 schrieb Zhou, David(ChunMing):
cmpxchg be replaced by some simple c sentance?
otherwise we have to remove __rcu of chian->prev.
-David
Original Message
Subject: Re: [PATCH 1/9] dma-buf: add new dma_fence_chain container v6
F
simple c sentance?
otherwise we have to remove __rcu of chian->prev.
-David
Original Message
Subject: Re: [PATCH 1/9] dma-buf: add new dma_fence_chain container v6
From: Christian König
To: "Zhou, David(ChunMing)" ,kbuild test robot ,"Zhou, David(ChunMing)"
CC:
cmpxchg be replaced by some simple c sentance?
otherwise we have to remove __rcu of chian->prev.
-David
Original Message
Subject: Re: [PATCH 1/9] dma-buf: add new dma_fence_chain container v6
From: Christian König
To: "Zhou, David(ChunMing)" ,kbuild test robot
Hi David,
For the cmpxchg() case I of hand don't know either. Looks like so far
nobody has used cmpxchg() with rcu protected structures.
The other cases should be replaced by RCU_INIT_POINTER() or
rcu_dereference_protected(.., true);
Regards,
Christian.
Am 21.03.19 um 07:34 schrieb zhoucm1
Hi Lionel and Christian,
Below is robot report for chain->prev, which was added __rcu as you
suggested.
How to fix this line "tmp = cmpxchg(&chain->prev, prev, replacement); "?
I checked kernel header file, seems it has no cmpxchg for rcu.
Any suggestion to fix this robot report?
Thanks,
-Da
Hi Chunming,
I love your patch! Perhaps something to improve:
[auto build test WARNING on linus/master]
[also build test WARNING on v5.1-rc1 next-20190320]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system]
url:
https://github.com/0day-ci/linu
From: Christian König
Lockless container implementation similar to a dma_fence_array, but with
only two elements per node and automatic garbage collection.
v2: properly document dma_fence_chain_for_each, add dma_fence_chain_find_seqno,
drop prev reference during garbage collection if it's no
