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Howlett" To: Lorenzo Stoakes Cc: Andrew Morton , Suren Baghdasaryan , Vlastimil Babka , Shakeel Butt , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm/vma: small VMA lock cleanups Message-ID: Mail-Followup-To: "Liam R. 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 R4nd/J6e BSlay4iriNTPq56qvmrBu4G9oyls6N2XvkO1lRv3oEdcVP4YHQEIWwxVbqdUIgSyOh/mQ+X5tYBCNcqE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: * Lorenzo Stoakes [251024 05:09]: > We declare vma_start_read() as a static function in mm/mmap_lock.c, so > there is no need to provide a stub for !CONFIG_PER_VMA_LOCK. > > __is_vma_write_locked() is declared in a header and should therefore be static > inline. > > Put parens around (refcnt & VMA_LOCK_OFFSET) in is_vma_writer_only() to make > precedence clear. > > Signed-off-by: Lorenzo Stoakes Reviewed-by: Liam R. Howlett > --- > include/linux/mmap_lock.h | 7 ++----- > 1 file changed, 2 insertions(+), 5 deletions(-) > > diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h > index 2c9fffa58714..e05da70dc0cb 100644 > --- a/include/linux/mmap_lock.h > +++ b/include/linux/mmap_lock.h > @@ -130,7 +130,7 @@ static inline bool is_vma_writer_only(int refcnt) > * a detached vma happens only in vma_mark_detached() and is a rare > * case, therefore most of the time there will be no unnecessary wakeup. > */ > - return refcnt & VMA_LOCK_OFFSET && refcnt <= VMA_LOCK_OFFSET + 1; > + return (refcnt & VMA_LOCK_OFFSET) && refcnt <= VMA_LOCK_OFFSET + 1; > } > > static inline void vma_refcount_put(struct vm_area_struct *vma) > @@ -183,7 +183,7 @@ static inline void vma_end_read(struct vm_area_struct *vma) > } > > /* WARNING! Can only be used if mmap_lock is expected to be write-locked */ > -static bool __is_vma_write_locked(struct vm_area_struct *vma, unsigned int *mm_lock_seq) > +static inline bool __is_vma_write_locked(struct vm_area_struct *vma, unsigned int *mm_lock_seq) > { > mmap_assert_write_locked(vma->vm_mm); > > @@ -281,9 +281,6 @@ static inline bool mmap_lock_speculate_retry(struct mm_struct *mm, unsigned int > return true; > } > static inline void vma_lock_init(struct vm_area_struct *vma, bool reset_refcnt) {} > -static inline struct vm_area_struct *vma_start_read(struct mm_struct *mm, > - struct vm_area_struct *vma) > - { return NULL; } > static inline void vma_end_read(struct vm_area_struct *vma) {} > static inline void vma_start_write(struct vm_area_struct *vma) {} > static inline void vma_assert_write_locked(struct vm_area_struct *vma) > -- > 2.51.0 >