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| author | Mark Rutland <mark.rutland@arm.com> | 2021-11-29 16:06:44 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2021-12-01 02:06:43 +0300 |
| commit | 6ce895128b3bff738fe8d9dd74747a03e319e466 (patch) | |
| tree | d8585eb931fe75bba40f3cbaf0edc85ab40edd7e /include/linux/entry-kvm.h | |
| parent | dca99fb643a2e9bc2e67a0f626b09d4f177f0f09 (diff) | |
| download | linux-6ce895128b3bff738fe8d9dd74747a03e319e466.tar.xz | |
entry: 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: Paul E. McKenney <paulmck@kernel.org>
Link: https://lore.kernel.org/r/20211129130653.2037928-3-mark.rutland@arm.com
Diffstat (limited to 'include/linux/entry-kvm.h')
| -rw-r--r-- | include/linux/entry-kvm.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/entry-kvm.h b/include/linux/entry-kvm.h index 0d7865a0731c..07c878d6e323 100644 --- a/include/linux/entry-kvm.h +++ b/include/linux/entry-kvm.h @@ -75,7 +75,7 @@ static inline void xfer_to_guest_mode_prepare(void) */ static inline bool __xfer_to_guest_mode_work_pending(void) { - unsigned long ti_work = READ_ONCE(current_thread_info()->flags); + unsigned long ti_work = read_thread_flags(); return !!(ti_work & XFER_TO_GUEST_MODE_WORK); } |