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Groups > linux.kernel > #1460958

Re: [PATCH 1/2] Revert "drm/fb-helper: Reduce READ_ONCE(master) to lockless_dereference"

From Johannes Berg <johannes@sipsolutions.net>
Newsgroups linux.kernel
Subject Re: [PATCH 1/2] Revert "drm/fb-helper: Reduce READ_ONCE(master) to lockless_dereference"
Date 2016-08-12 08:10 +0200
Message-ID <s5dPj-6mv-3@gated-at.bofh.it> (permalink)
References <s4UWl-289-9@gated-at.bofh.it> <s4Vz3-2BB-13@gated-at.bofh.it> <s56Ea-1t7-13@gated-at.bofh.it>
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> Initial testing says that the change below must precede the change
> to the definition of lockless_dereference(), so the two should go
> together.

Indeed.

> If my upcoming testing of the two changes together pans out, I will
> give you a Tested-by -- I am guessing that you don't want to wait
> until the next merge window for these changes.

I don't mind hugely since I have a fix now, but this one actually
causes >1K warnings (including some "too many warnings!") for my build
(net/wireless and net/mac80211 only!) and drowns out the real ones...
I'm sure other parts of the tree are similarly affected.

johannes

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Thread

[PATCH 1/2] Revert "drm/fb-helper: Reduce READ_ONCE(master) to lockless_dereference" Johannes Berg <johannes@sipsolutions.net> - 2016-08-11 12:00 +0200
  [PATCH 2/2] locking/barriers: suppress sparse warnings in lockless_dereference() Johannes Berg <johannes@sipsolutions.net> - 2016-08-11 12:00 +0200
    [tip:locking/core] locking/barriers: Suppress sparse warnings in  lockless_dereference() tip-bot for Johannes Berg <tipbot@zytor.com> - 2016-08-18 13:10 +0200
    [tip:locking/urgent] locking/barriers: Suppress sparse warnings in  lockless_dereference() tip-bot for Johannes Berg <tipbot@zytor.com> - 2016-08-18 15:50 +0200
  Re: [PATCH 1/2] Revert "drm/fb-helper: Reduce READ_ONCE(master) to  lockless_dereference" Daniel Vetter <daniel@ffwll.ch> - 2016-08-11 12:40 +0200
    Re: [PATCH 1/2] Revert "drm/fb-helper: Reduce READ_ONCE(master) to  lockless_dereference" "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-12 00:30 +0200
      Re: [PATCH 1/2] Revert "drm/fb-helper: Reduce READ_ONCE(master) to  lockless_dereference" Johannes Berg <johannes@sipsolutions.net> - 2016-08-12 08:10 +0200
      Re: [PATCH 1/2] Revert "drm/fb-helper: Reduce READ_ONCE(master) to  lockless_dereference" Peter Zijlstra <peterz@infradead.org> - 2016-08-12 20:30 +0200
        Re: [PATCH 1/2] Revert "drm/fb-helper: Reduce READ_ONCE(master) to  lockless_dereference" "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-12 21:20 +0200
  [tip:locking/core] Revert "drm/fb-helper: Reduce READ_ONCE(master)  to lockless_dereference" tip-bot for Johannes Berg <tipbot@zytor.com> - 2016-08-18 13:10 +0200
  [tip:locking/urgent] Revert "drm/fb-helper: Reduce  READ_ONCE(master) to lockless_dereference" tip-bot for Johannes Berg <tipbot@zytor.com> - 2016-08-18 15:50 +0200

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