diff options
| author | Vlastimil Babka <vbabka@suse.cz> | 2025-11-05 10:05:33 +0100 |
|---|---|---|
| committer | Vlastimil Babka <vbabka@suse.cz> | 2025-11-07 09:59:15 +0100 |
| commit | 4c0a17e28340e458627d672564200406e220d6a3 (patch) | |
| tree | 7c2fa4bda3acd2559f5c9fecf798175583e420bb /include | |
| parent | 31e0886fd57d426d18a239dd55e176032c9c1cb0 (diff) | |
slab: prevent recursive kmalloc() in alloc_empty_sheaf()
We want to expand usage of sheaves to all non-boot caches, including
kmalloc caches. Since sheaves themselves are also allocated by
kmalloc(), we need to prevent excessive or infinite recursion -
depending on sheaf size, the sheaf can be allocated from smaller, same
or larger kmalloc size bucket, there's no particular constraint.
This is similar to allocating the objext arrays so let's just reuse the
existing mechanisms for those. __GFP_NO_OBJ_EXT in alloc_empty_sheaf()
will prevent a nested kmalloc() from allocating a sheaf itself - it will
either have sheaves already, or fallback to a non-sheaf-cached
allocation (so bootstrap of sheaves in a kmalloc cache that allocates
sheaves from its own size bucket is possible). Additionally, reuse
OBJCGS_CLEAR_MASK to clear unwanted gfp flags from the nested
allocation.
Link: https://patch.msgid.link/20251105-sheaves-cleanups-v1-5-b8218e1ac7ef@suse.cz
Reviewed-by: Harry Yoo <harry.yoo@oracle.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/gfp_types.h | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/include/linux/gfp_types.h b/include/linux/gfp_types.h index 65db9349f905..3de43b12209e 100644 --- a/include/linux/gfp_types.h +++ b/include/linux/gfp_types.h @@ -55,9 +55,7 @@ enum { #ifdef CONFIG_LOCKDEP ___GFP_NOLOCKDEP_BIT, #endif -#ifdef CONFIG_SLAB_OBJ_EXT ___GFP_NO_OBJ_EXT_BIT, -#endif ___GFP_LAST_BIT }; @@ -98,11 +96,7 @@ enum { #else #define ___GFP_NOLOCKDEP 0 #endif -#ifdef CONFIG_SLAB_OBJ_EXT #define ___GFP_NO_OBJ_EXT BIT(___GFP_NO_OBJ_EXT_BIT) -#else -#define ___GFP_NO_OBJ_EXT 0 -#endif /* * Physical address zone modifiers (see linux/mmzone.h - low four bits) |