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| author |   Thomas Gleixner <tglx@linutronix.de> | 2019-11-06 22:55:37 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-11-20 09:40:07 +0100 |
| commit | 3d4775df0a89240f671861c6ab6e8d59af8e9e41 (patch) | |
| tree | 6813a938bd225f703d9569f60eea618a82642e31 /include/linux/sched.h | |
| parent | futex: Move futex exit handling into futex code (diff) | |
| download | linux-dev-3d4775df0a89240f671861c6ab6e8d59af8e9e41.tar.xz linux-dev-3d4775df0a89240f671861c6ab6e8d59af8e9e41.zip | |
futex: Replace PF_EXITPIDONE with a state
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
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 2c2e56bd8913..85dab2f721c9 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1053,6 +1053,7 @@ struct task_struct { #endif struct list_head pi_state_list; struct futex_pi_state *pi_state_cache; + unsigned int futex_state; #endif #ifdef CONFIG_PERF_EVENTS struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; @@ -1441,7 +1442,6 @@ extern struct pid *cad_pid; */ #define PF_IDLE 0x00000002 /* I am an IDLE thread */ #define PF_EXITING 0x00000004 /* Getting shut down */ -#define PF_EXITPIDONE 0x00000008 /* PI exit done on shut down */ #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ #define PF_FORKNOEXEC 0x00000040 /* Forked but didn't exec */ |