diff options
author | Thomas Gleixner <tglx@linutronix.de> | 2019-11-06 22:55:37 +0100 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-05 15:38:23 +0100 |
commit | c35d0ebed357f47ede0afef03699db29f14032c1 (patch) | |
tree | 6a2e26db9a5406b5a2263befd3950760cfba5949 /block | |
parent | 2f6c5ebbbbc9d9193831e77e614c61ad03c77925 (diff) |
futex: Replace PF_EXITPIDONE with a state
commit 3d4775df0a89240f671861c6ab6e8d59af8e9e41 upstream.
The futex exit handling relies on PF_ flags. That's suboptimal as it
requires a smp_mb() and an ugly lock/unlock of the exiting tasks pi_lock in
the middle of do_exit() to enforce the observability of PF_EXITING in the
futex code.
Add a futex_state member to task_struct and convert the PF_EXITPIDONE logic
over to the new state. The PF_EXITING dependency will be cleaned up in a
later step.
This prepares for handling various futex exit issues later.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20191106224556.149449274@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'block')
0 files changed, 0 insertions, 0 deletions