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authorPeter Zijlstra <[email protected]>2017-03-22 11:35:51 +0100
committerThomas Gleixner <[email protected]>2017-03-23 19:10:07 +0100
commit5293c2efda37775346885c7e924d4ef7018ea60b (patch)
tree77868b67d43f614989c465d06415d6e1a90f5c4b /drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c
parentfffa954fb528963c2fb7b0c0084eb77e2be7ab52 (diff)
futex,rt_mutex: Provide futex specific rt_mutex API
Part of what makes futex_unlock_pi() intricate is that rt_mutex_futex_unlock() -> rt_mutex_slowunlock() can drop rt_mutex::wait_lock. This means it cannot rely on the atomicy of wait_lock, which would be preferred in order to not rely on hb->lock so much. The reason rt_mutex_slowunlock() needs to drop wait_lock is because it can race with the rt_mutex fastpath, however futexes have their own fast path. Since futexes already have a bunch of separate rt_mutex accessors, complete that set and implement a rt_mutex variant without fastpath for them. Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Thomas Gleixner <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c')
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