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freedreno@lists.freedesktop.org, linux-tegra@vger.kernel.org, kvm@vger.kernel.org, Russell King References: <20260710-b4-pre-scalable-cow-v2-0-2a5aa403d977@kernel.org> <20260710-b4-pre-scalable-cow-v2-13-2a5aa403d977@kernel.org> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/10/26 22:16, Lorenzo Stoakes wrote: > In the VMA logic we often need to determine the number of pages in the > specified merge range, as well as the start and end page offsets of that > range. > > Introduce and use helpers for these purposes. > > No functional change intended. > > Reviewed-by: Pedro Falcato > Reviewed-by: Gregory Price > Signed-off-by: Lorenzo Stoakes Uh, the PHYS_PFN() usage here was quite an abuse. Good riddance. Reviewed-by: Vlastimil Babka (SUSE) > --- > mm/vma.c | 11 ++++------- > mm/vma.h | 17 +++++++++++++++++ > 2 files changed, 21 insertions(+), 7 deletions(-) > > diff --git a/mm/vma.c b/mm/vma.c > index 35ba3475128f..995de8198fbb 100644 > --- a/mm/vma.c > +++ b/mm/vma.c > @@ -197,11 +197,9 @@ static void init_multi_vma_prep(struct vma_prepare *vp, > */ > static bool can_vma_merge_before(struct vma_merge_struct *vmg) > { > - pgoff_t pglen = PHYS_PFN(vmg->end - vmg->start); > - > if (is_mergeable_vma(vmg, /* merge_next = */ true) && > is_mergeable_anon_vma(vmg, /* merge_next = */ true)) { > - if (vmg->next->vm_pgoff == vmg->pgoff + pglen) > + if (vmg_end_pgoff(vmg) == vma_start_pgoff(vmg->next)) > return true; > } > > @@ -221,7 +219,7 @@ static bool can_vma_merge_after(struct vma_merge_struct *vmg) > { > if (is_mergeable_vma(vmg, /* merge_next = */ false) && > is_mergeable_anon_vma(vmg, /* merge_next = */ false)) { > - if (vmg->prev->vm_pgoff + vma_pages(vmg->prev) == vmg->pgoff) > + if (vma_end_pgoff(vmg->prev) == vmg_start_pgoff(vmg)) > return true; > } > return false; > @@ -759,7 +757,7 @@ static int commit_merge(struct vma_merge_struct *vmg) > */ > vma_adjust_trans_huge(vma, vmg->start, vmg->end, > vmg->__adjust_middle_start ? vmg->middle : NULL); > - vma_set_range(vma, vmg->start, vmg->end, vmg->pgoff); > + vma_set_range(vma, vmg->start, vmg->end, vmg_start_pgoff(vmg)); > vmg_adjust_set_range(vmg); > vma_iter_store_overwrite(vmg->vmi, vmg->target); > > @@ -962,8 +960,7 @@ static __must_check struct vm_area_struct *vma_merge_existing_range( > * middle next > * shrink/delete extend > */ > - > - pgoff_t pglen = PHYS_PFN(vmg->end - vmg->start); > + const pgoff_t pglen = vmg_pages(vmg); > > VM_WARN_ON_VMG(!merge_right, vmg); > /* If we are offset into a VMA, then prev must be middle. */ > diff --git a/mm/vma.h b/mm/vma.h > index 8e4b61a7304c..527716c8739d 100644 > --- a/mm/vma.h > +++ b/mm/vma.h > @@ -230,6 +230,23 @@ static inline bool vmg_nomem(struct vma_merge_struct *vmg) > return vmg->state == VMA_MERGE_ERROR_NOMEM; > } > > +static inline pgoff_t vmg_start_pgoff(const struct vma_merge_struct *vmg) > +{ > + return vmg->pgoff; > +} > + > +static inline pgoff_t vmg_pages(const struct vma_merge_struct *vmg) > +{ > + const unsigned long size = vmg->end - vmg->start; > + > + return size >> PAGE_SHIFT; > +} > + > +static inline pgoff_t vmg_end_pgoff(const struct vma_merge_struct *vmg) > +{ > + return vmg_start_pgoff(vmg) + vmg_pages(vmg); > +} > + > /* Assumes addr >= vma->vm_start. */ > static inline pgoff_t vma_pgoff_offset(struct vm_area_struct *vma, > unsigned long addr) >