+ mm-vmalloc-fix-vbq-free-breakage.patch added to mm-hotfixes-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/vmalloc: fix vbq->free breakage
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     mm-vmalloc-fix-vbq-free-breakage.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-fix-vbq-free-breakage.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: "hailong.liu" <hailong.liu@oppo.com>
Subject: mm/vmalloc: fix vbq->free breakage
Date: Thu, 30 May 2024 17:31:08 +0800

The function xa_for_each() in _vm_unmap_aliases() loops through all vbs. 
However, since commit 062eacf57ad9 ("mm: vmalloc: remove a global
vmap_blocks xarray") the vb from xarray may not be on the corresponding
CPU vmap_block_queue.  Consequently, purge_fragmented_block() might use
the wrong vbq->lock to protect the free list, leading to vbq->free
breakage.

Link: https://lkml.kernel.org/r/20240530093108.4512-1-hailong.liu@oppo.com
Fixes: fc1e0d980037 ("mm/vmalloc: prevent stale TLBs in fully utilized blocks")
Signed-off-by: Hailong.Liu <liuhailong@oppo.com>
Reported-by: Guangye Yang <guangye.yang@mediatek.com>
Cc: Barry Song <21cnbao@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Gao Xiang <xiang@kernel.org>
Cc: Guangye Yang <guangye.yang@mediatek.com>
Cc: liuhailong <liuhailong@oppo.com>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/vmalloc.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/mm/vmalloc.c~mm-vmalloc-fix-vbq-free-breakage
+++ a/mm/vmalloc.c
@@ -2830,10 +2830,9 @@ static void _vm_unmap_aliases(unsigned l
 	for_each_possible_cpu(cpu) {
 		struct vmap_block_queue *vbq = &per_cpu(vmap_block_queue, cpu);
 		struct vmap_block *vb;
-		unsigned long idx;
 
 		rcu_read_lock();
-		xa_for_each(&vbq->vmap_blocks, idx, vb) {
+		list_for_each_entry_rcu(vb, &vbq->free, free_list) {
 			spin_lock(&vb->lock);
 
 			/*
_

Patches currently in -mm which might be from hailong.liu@oppo.com are

mm-vmalloc-fix-vbq-free-breakage.patch