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Date: Tue, 30 Aug 2022 14:49:01 -0700 From: Suren Baghdasaryan <surenb@...gle.com> To: akpm@...ux-foundation.org Cc: kent.overstreet@...ux.dev, mhocko@...e.com, vbabka@...e.cz, hannes@...xchg.org, roman.gushchin@...ux.dev, mgorman@...e.de, dave@...olabs.net, willy@...radead.org, liam.howlett@...cle.com, void@...ifault.com, peterz@...radead.org, juri.lelli@...hat.com, ldufour@...ux.ibm.com, peterx@...hat.com, david@...hat.com, axboe@...nel.dk, mcgrof@...nel.org, masahiroy@...nel.org, nathan@...nel.org, changbin.du@...el.com, ytcoode@...il.com, vincent.guittot@...aro.org, dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com, bristot@...hat.com, vschneid@...hat.com, cl@...ux.com, penberg@...nel.org, iamjoonsoo.kim@....com, 42.hyeyoo@...il.com, glider@...gle.com, elver@...gle.com, dvyukov@...gle.com, shakeelb@...gle.com, songmuchun@...edance.com, arnd@...db.de, jbaron@...mai.com, rientjes@...gle.com, minchan@...gle.com, kaleshsingh@...gle.com, surenb@...gle.com, kernel-team@...roid.com, linux-mm@...ck.org, iommu@...ts.linux.dev, kasan-dev@...glegroups.com, io-uring@...r.kernel.org, linux-arch@...r.kernel.org, xen-devel@...ts.xenproject.org, linux-bcache@...r.kernel.org, linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [RFC PATCH 12/30] mm: introduce __GFP_NO_OBJ_EXT flag to selectively prevent slabobj_ext creation Introduce __GFP_NO_OBJ_EXT flag in order to prevent recursive allocations when allocating slabobj_ext on a slab. Signed-off-by: Suren Baghdasaryan <surenb@...gle.com> --- include/linux/gfp_types.h | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/include/linux/gfp_types.h b/include/linux/gfp_types.h index d88c46ca82e1..a2cba1d20b86 100644 --- a/include/linux/gfp_types.h +++ b/include/linux/gfp_types.h @@ -55,8 +55,13 @@ typedef unsigned int __bitwise gfp_t; #define ___GFP_SKIP_KASAN_UNPOISON 0 #define ___GFP_SKIP_KASAN_POISON 0 #endif +#ifdef CONFIG_SLAB_OBJ_EXT +#define ___GFP_NO_OBJ_EXT 0x8000000u +#else +#define ___GFP_NO_OBJ_EXT 0 +#endif #ifdef CONFIG_LOCKDEP -#define ___GFP_NOLOCKDEP 0x8000000u +#define ___GFP_NOLOCKDEP 0x10000000u #else #define ___GFP_NOLOCKDEP 0 #endif @@ -101,12 +106,15 @@ typedef unsigned int __bitwise gfp_t; * node with no fallbacks or placement policy enforcements. * * %__GFP_ACCOUNT causes the allocation to be accounted to kmemcg. + * + * %__GFP_NO_OBJ_EXT causes slab allocation to have no object extension. */ #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) #define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) #define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) #define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE) #define __GFP_ACCOUNT ((__force gfp_t)___GFP_ACCOUNT) +#define __GFP_NO_OBJ_EXT ((__force gfp_t)___GFP_NO_OBJ_EXT) /** * DOC: Watermark modifiers @@ -256,7 +264,7 @@ typedef unsigned int __bitwise gfp_t; #define __GFP_NOLOCKDEP ((__force gfp_t)___GFP_NOLOCKDEP) /* Room for N __GFP_FOO bits */ -#define __GFP_BITS_SHIFT (27 + IS_ENABLED(CONFIG_LOCKDEP)) +#define __GFP_BITS_SHIFT (28 + IS_ENABLED(CONFIG_LOCKDEP)) #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) /** -- 2.37.2.672.g94769d06f0-goog
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