From: Lorenzo Stoakes <lstoakes@gmail.com>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Matthew Wilcox <willy@infradead.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
patches@lists.linux.dev, maple-tree@lists.infradead.org
Subject: Re: [PATCH 07/10] mm/mmap/vma_merge: rename adj_next to adj_start
Date: Wed, 15 Mar 2023 21:38:37 +0000 [thread overview]
Message-ID: <f6a24126-99b8-4b6b-a456-bd6633ec491b@lucifer.local> (raw)
In-Reply-To: <20230309111258.24079-8-vbabka@suse.cz>
On Thu, Mar 09, 2023 at 12:12:55PM +0100, Vlastimil Babka wrote:
> The variable 'adj_next' holds the value by which we adjust vm_start of a
> vma in variable 'adjust', that's either 'next' or 'mid', so the current
> name is inaccurate. Rename it to 'adj_start'.
>
> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
> ---
> mm/mmap.c | 16 ++++++++--------
> 1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/mm/mmap.c b/mm/mmap.c
> index 3396c9b13f1c..c51d69592e4e 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -903,7 +903,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
> bool vma_expanded = false;
> struct vma_prepare vp;
> unsigned long vma_end = end;
> - long adj_next = 0;
> + long adj_start = 0;
> unsigned long vma_start = addr;
>
> validate_mm(mm);
> @@ -971,7 +971,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
> remove = mid;
> } else { /* case 5 */
> adjust = mid;
> - adj_next = (end - mid->vm_start);
> + adj_start = (end - mid->vm_start);
> }
> }
> } else if (merge_next) {
> @@ -979,7 +979,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
> if (prev && addr < prev->vm_end) { /* case 4 */
> vma_end = addr;
> adjust = next;
> - adj_next = -(prev->vm_end - addr);
> + adj_start = -(prev->vm_end - addr);
> err = dup_anon_vma(next, prev);
> } else {
> vma = next; /* case 3 */
> @@ -1002,7 +1002,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
> if (vma_iter_prealloc(vmi))
> return NULL;
>
> - vma_adjust_trans_huge(vma, vma_start, vma_end, adj_next);
> + vma_adjust_trans_huge(vma, vma_start, vma_end, adj_start);
> init_multi_vma_prep(&vp, vma, adjust, remove, remove2);
> VM_WARN_ON(vp.anon_vma && adjust && adjust->anon_vma &&
> vp.anon_vma != adjust->anon_vma);
> @@ -1018,10 +1018,10 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
> if (vma_expanded)
> vma_iter_store(vmi, vma);
>
> - if (adj_next) {
> - adjust->vm_start += adj_next;
> - adjust->vm_pgoff += adj_next >> PAGE_SHIFT;
> - if (adj_next < 0) {
> + if (adj_start) {
> + adjust->vm_start += adj_start;
> + adjust->vm_pgoff += adj_start >> PAGE_SHIFT;
> + if (adj_start < 0) {
> WARN_ON(vma_expanded);
> vma_iter_store(vmi, next);
> }
> --
> 2.39.2
>
This feels like a very silly oversight in the first instance but I imagine one
that is a result of 'code evolution' :) excellent improvement in clarity, so:-
Reviewed-By: Lorenzo Stoakes <lstoakes@gmail.com>
next prev parent reply other threads:[~2023-03-15 21:38 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-09 11:12 [PATCH 00/10] cleanup vma_merge() and improve mergeability tests Vlastimil Babka
2023-03-09 11:12 ` [PATCH 01/10] mm/mmap/vma_merge: use only primary pointers for preparing merge Vlastimil Babka
2023-03-14 22:52 ` Lorenzo Stoakes
2023-03-09 11:12 ` [PATCH 02/10] mm/mmap/vma_merge: use the proper vma pointer in case 3 Vlastimil Babka
2023-03-15 19:04 ` Lorenzo Stoakes
2023-03-09 11:12 ` [PATCH 03/10] mm/mmap/vma_merge: use the proper vma pointers in cases 1 and 6 Vlastimil Babka
2023-03-15 19:43 ` Lorenzo Stoakes
2023-03-09 11:12 ` [PATCH 04/10] mm/mmap/vma_merge: use the proper vma pointer in case 4 Vlastimil Babka
2023-03-15 19:54 ` Lorenzo Stoakes
2023-03-09 11:12 ` [PATCH 05/10] mm/mmap/vma_merge: initialize mid and next in natural order Vlastimil Babka
2023-03-15 20:10 ` Lorenzo Stoakes
2023-03-09 11:12 ` [PATCH 06/10] mm/mmap/vma_merge: set mid to NULL if not applicable Vlastimil Babka
2023-03-15 21:34 ` Lorenzo Stoakes
2023-03-16 10:11 ` Vlastimil Babka
2023-03-09 11:12 ` [PATCH 07/10] mm/mmap/vma_merge: rename adj_next to adj_start Vlastimil Babka
2023-03-14 22:36 ` Lorenzo Stoakes
2023-03-15 21:38 ` Lorenzo Stoakes [this message]
2023-03-09 11:12 ` [PATCH 08/10] mm/mmap/vma_merge: convert mergeability checks to return bool Vlastimil Babka
2023-03-15 21:43 ` Lorenzo Stoakes
2023-03-09 11:12 ` [PATCH 09/10] mm/mmap: start distinguishing if vma can be removed in mergeability test Vlastimil Babka
2023-03-15 22:05 ` Lorenzo Stoakes
2023-03-16 10:57 ` Vlastimil Babka
2023-03-09 11:12 ` [PATCH 10/10] mm/mremap: simplify vma expansion again Vlastimil Babka
2023-03-15 22:20 ` Lorenzo Stoakes
2023-03-16 8:35 ` Vlastimil Babka
2023-03-20 14:16 ` [PATCH 00/10] cleanup vma_merge() and improve mergeability tests Liam R. Howlett
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