Messages in this thread | | | Subject | Re: [PATCH v2 1/2] mmap locking API: add mmap_lock_is_contended() | From | Steven Price <> | Date | Thu, 13 Aug 2020 09:21:31 +0100 |
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On 13/08/2020 03:13, Chinwen Chang wrote: > Add new API to query if someone wants to acquire mmap_lock > for write attempts. > > Using this instead of rwsem_is_contended makes it more tolerant > of future changes to the lock type. > > Signed-off-by: Chinwen Chang <chinwen.chang@mediatek.com>
Reviewed-by: Steven Price <steven.price@arm.com>
> --- > include/linux/mmap_lock.h | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h > index 0707671..18e7eae 100644 > --- a/include/linux/mmap_lock.h > +++ b/include/linux/mmap_lock.h > @@ -87,4 +87,9 @@ static inline void mmap_assert_write_locked(struct mm_struct *mm) > VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm); > } > > +static inline int mmap_lock_is_contended(struct mm_struct *mm) > +{ > + return rwsem_is_contended(&mm->mmap_lock); > +} > + > #endif /* _LINUX_MMAP_LOCK_H */ >
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