Messages in this thread | | | From | "Zhang, Qiang1" <> | Subject | RE: [PATCH v2] locking/rtmutex: Fix incorrect spinning condition | Date | Mon, 20 Dec 2021 01:54:19 +0000 |
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> When the lock owner is on CPU and not need resched, the current waiter > need to be checked, if it not longer top the waiter, stop spinning. > >Incorrect grammar, should be "if it is no longer the top waiter". There is a similar typo in the existing code comment too. > >You can modify the subject line to [PATCH-tip ...] to indicate that it is supposed to be apply on top of the tip tree. Other than that, the patch looks good.
Thanks, Longman. I will modify it and resend.
Thanks,
Zqiang > >Cheers, >Longman
> > Fixes: c3123c431447 ("locking/rtmutex: Dont dereference waiter > lockless") > Signed-off-by: Zqiang <qiang1.zhang@intel.com> > --- > v1->v2: > Modify description information. > > kernel/locking/rtmutex.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c index > 0c1f2e3f019a..8555c4efe97c 100644 > --- a/kernel/locking/rtmutex.c > +++ b/kernel/locking/rtmutex.c > @@ -1383,7 +1383,7 @@ static bool rtmutex_spin_on_owner(struct rt_mutex_base *lock, > * - the VCPU on which owner runs is preempted > */ > if (!owner_on_cpu(owner) || need_resched() || > - rt_mutex_waiter_is_top_waiter(lock, waiter)) { > + !rt_mutex_waiter_is_top_waiter(lock, waiter)) { > res = false; > break; > }
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