The patch titled
Subject: mm/vmalloc: remove the redundant boundary check
has been added to the -mm mm-unstable branch. Its filename is
mm-vmalloc-remove-the-redundant-boundary-check.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-remove-the-redundant-boundary-check.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Baoquan He <bhe@xxxxxxxxxx>
Subject: mm/vmalloc: remove the redundant boundary check
Date: Mon, 6 Jun 2022 16:39:06 +0800
In function find_va_links(), when traversing the vmap_area tree, the
comparing to check if the passed in 'va' is above or below 'tmp_va' is
redundant, assuming both 'va' and 'tmp_va' has ->va_start <= ->va_end.
Here, to simplify the checking as code change.
Link: https://lkml.kernel.org/r/20220606083909.363350-3-bhe@xxxxxxxxxx
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmalloc.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
--- a/mm/vmalloc.c~mm-vmalloc-remove-the-redundant-boundary-check
+++ a/mm/vmalloc.c
@@ -874,11 +874,9 @@ find_va_links(struct vmap_area *va,
* Trigger the BUG() if there are sides(left/right)
* or full overlaps.
*/
- if (va->va_start < tmp_va->va_end &&
- va->va_end <= tmp_va->va_start)
+ if (va->va_end <= tmp_va->va_start)
link = &(*link)->rb_left;
- else if (va->va_end > tmp_va->va_start &&
- va->va_start >= tmp_va->va_end)
+ else if (va->va_start >= tmp_va->va_end)
link = &(*link)->rb_right;
else {
WARN(1, "vmalloc bug: 0x%lx-0x%lx overlaps with 0x%lx-0x%lx\n",
_
Patches currently in -mm which might be from bhe@xxxxxxxxxx are
mm-vmalloc-remove-the-unnecessary-type-check.patch
mm-vmalloc-remove-the-redundant-boundary-check.patch
mm-vmalloc-fix-typo-in-local-variable-name.patch
mm-vmalloc-add-code-comment-for-find_vmap_area_exceed_addr.patch
mm-ioremap-rename-ioremap_page_range-to-ioremap_range.patch
