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| author | Mark Rutland <mark.rutland@arm.com> | 2021-11-29 16:06:50 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2021-12-01 02:06:44 +0300 |
| commit | 4ea7ce0a79b9450b71b9a88f9f5adbfe2bc3f2e5 (patch) | |
| tree | 6819aaf532c6353ffb995a5d8035e9916a2b0296 /arch/openrisc | |
| parent | e538c5849143a7f0aa97006cd45ce4c0c26d0744 (diff) | |
| download | linux-4ea7ce0a79b9450b71b9a88f9f5adbfe2bc3f2e5.tar.xz | |
openrisc: Snapshot thread flags
Some thread flags can be set remotely, and so even when IRQs are disabled,
the flags can change under our feet. Generally this is unlikely to cause a
problem in practice, but it is somewhat unsound, and KCSAN will
legitimately warn that there is a data race.
To avoid such issues, a snapshot of the flags has to be taken prior to
using them. Some places already use READ_ONCE() for that, others do not.
Convert them all to the new flag accessor helpers.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Stafford Horne <shorne@gmail.com>
Acked-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Link: https://lore.kernel.org/r/20211129130653.2037928-9-mark.rutland@arm.com
Diffstat (limited to 'arch/openrisc')
| -rw-r--r-- | arch/openrisc/kernel/signal.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/openrisc/kernel/signal.c b/arch/openrisc/kernel/signal.c index 99516c9191c7..92c5b70740f5 100644 --- a/arch/openrisc/kernel/signal.c +++ b/arch/openrisc/kernel/signal.c @@ -313,7 +313,7 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall) } } local_irq_disable(); - thread_flags = current_thread_info()->flags; + thread_flags = read_thread_flags(); } while (thread_flags & _TIF_WORK_MASK); return 0; } |