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Suren Baghdasaryan wrote: > On Wed, Dec 17, 2025 at 4:27 AM Lorenzo Stoakes > wrote: > > > > This makes it easy to explicitly check for VMA detachment, which is useful > > for things like asserts. > > > > Note that we intentionally do not allow this function to be available > > should CONFIG_PER_VMA_LOCK be set - this is because vma_assert_attached() > > and vma_assert_detached() are no-ops if !CONFIG_PER_VMA_LOCK, so there is > > no correct state for vma_is_attached() to be in if this configuration > > option is not specified. > > > > Therefore users elsewhere must invoke this function only after checking for > > CONFIG_PER_VMA_LOCK. > > > > We rework the assert functions to utilise this. > > Thank you! This nicely documents vm_refcnt attached state. Another You're welcome! :) > step in this direction is adding: > > static inline bool vma_is_read_locked(struct vm_area_struct *vma) > { > return refcount_read(&vma->vm_refcnt) > 1; > } > > and changing vma_assert_locked() to use it. > But I can do that in a separate patch, so LGTM. Right, yeah makes sense separately I think as this change was to allow us to use this for an assert :) > > > > > Signed-off-by: Lorenzo Stoakes > > Reviewed-by: Suren Baghdasaryan Thanks! > > > --- > > include/linux/mmap_lock.h | 9 +++++++-- > > 1 file changed, 7 insertions(+), 2 deletions(-) > > > > diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h > > index d53f72dba7fe..b50416fbba20 100644 > > --- a/include/linux/mmap_lock.h > > +++ b/include/linux/mmap_lock.h > > @@ -251,6 +251,11 @@ static inline void vma_assert_locked(struct vm_area_struct *vma) > > !__is_vma_write_locked(vma, &mm_lock_seq), vma); > > } > > > > +static inline bool vma_is_attached(struct vm_area_struct *vma) > > +{ > > + return refcount_read(&vma->vm_refcnt); > > +} > > + > > /* > > * WARNING: to avoid racing with vma_mark_attached()/vma_mark_detached(), these > > * assertions should be made either under mmap_write_lock or when the object > > @@ -258,12 +263,12 @@ static inline void vma_assert_locked(struct vm_area_struct *vma) > > */ > > static inline void vma_assert_attached(struct vm_area_struct *vma) > > { > > - WARN_ON_ONCE(!refcount_read(&vma->vm_refcnt)); > > + WARN_ON_ONCE(!vma_is_attached(vma)); > > } > > > > static inline void vma_assert_detached(struct vm_area_struct *vma) > > { > > - WARN_ON_ONCE(refcount_read(&vma->vm_refcnt)); > > + WARN_ON_ONCE(vma_is_attached(vma)); > > } > > > > static inline void vma_mark_attached(struct vm_area_struct *vma) > > -- > > 2.52.0