The patch titled
Subject: mm: vmalloc: switch to find_unlink_vmap_area() in vm_unmap_ram()
has been added to the -mm mm-unstable branch. Its filename is
mm-vmalloc-switch-to-find_unlink_vmap_area-in-vm_unmap_ram.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-switch-to-find_unlink_vmap_area-in-vm_unmap_ram.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: "Uladzislau Rezki (Sony)" <urezki@xxxxxxxxx>
Subject: mm: vmalloc: switch to find_unlink_vmap_area() in vm_unmap_ram()
Date: Wed, 21 Dec 2022 18:44:53 +0100
Switch from find_vmap_area() to find_unlink_vmap_area() to prevent
a double access to the vmap_area_lock: one for finding area, second
time is for unlinking from a tree.
Link: https://lkml.kernel.org/r/20221221174454.1085130-2-urezki@xxxxxxxxx
Signed-off-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@xxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmalloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/vmalloc.c~mm-vmalloc-switch-to-find_unlink_vmap_area-in-vm_unmap_ram
+++ a/mm/vmalloc.c
@@ -2251,7 +2251,7 @@ void vm_unmap_ram(const void *mem, unsig
return;
}
- va = find_vmap_area(addr);
+ va = find_unlink_vmap_area(addr);
BUG_ON(!va);
debug_check_no_locks_freed((void *)va->va_start,
(va->va_end - va->va_start));
_
Patches currently in -mm which might be from urezki@xxxxxxxxx are
mm-vmalloc-avoid-of-calling-__find_vmap_area-twise-in-__vunmap.patch
mm-vmalloc-switch-to-find_unlink_vmap_area-in-vm_unmap_ram.patch
mm-vmalloc-replace-bug_on-by-warn_on_once.patch
