Kernel commit e36ce448a08d ("mm/slab: use kmalloc_node() for off slab
freelist_idx_t array allocation"), which is contained in Linux 6.1 and
later kernels, removed kmem_cache.freelist_cache member.
Without the patch, crash does not set SLAB_OVERLOAD_PAGE and
"kmem -s|-S" options fail with the following error:
kmem: invalid structure member offset: slab_list
FILE: memory.c LINE: 12156 FUNCTION: verify_slab_v2()
Use kmem_cache.freelist_size instead, which was instroduced together
with kmem_cache.freelist_cache by kernel commit 8456a648cf44.
These two patches look good to me. For them:
[1] [PATCH 1/2] SLAB: Fix for "kmem -s|-S" options on Linux 6.1 and later
[2] [PATCH 2/2] SLAB: Fix for "kmem -s|-S" options on Linux 6.2-rc1 and later
Ack.
Thanks.
Lianbo
Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
---
memory.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/memory.c b/memory.c
index 625a94b7d7d4..71ded688206f 100644
--- a/memory.c
+++ b/memory.c
@@ -535,8 +535,11 @@ vm_init(void)
/*
* slab: overload struct slab over struct page
* https://lkml.org/lkml/2013/10/16/155
+ *
+ * commit e36ce448a08d removed kmem_cache.freelist_cache in 6.1,
+ * so use freelist_size instead.
*/
- if (MEMBER_EXISTS("kmem_cache", "freelist_cache")) {
+ if (MEMBER_EXISTS("kmem_cache", "freelist_size")) {
vt->flags |= SLAB_OVERLOAD_PAGE;
ANON_MEMBER_OFFSET_INIT(page_s_mem, "page", "s_mem");
ANON_MEMBER_OFFSET_INIT(page_freelist, "page", "freelist");
--
2.31.1