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mm: remove the __GFP_NO_OBJ_EXT flag

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All users of the flag are converted to SLAB_ALLOC_NO_RECURSE or
ALLOC_NO_CODETAG (from __GFP_NO_CODETAG which reused the NO_OBJ_EXT bit). 
Free up the flag bit.

[Rebased onto __GFP_NO_CODETAG removal]
Link: https://lore.kernel.org/20260703-alloc-trylock-v5-16-c87b714e19d3@google.com
Signed-off-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Acked-by: Hao Ge <hao.ge@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Vlastimil Babka (SUSE) 2026-07-03 12:31:56 +00:00 committed by Andrew Morton
parent 6372aac4d4
commit 01c69ef56d
3 changed files with 1 additions and 23 deletions
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7
include/linux/gfp_types.h
View File

@ -55,7 +55,6 @@ enum {
#ifdef CONFIG_LOCKDEP
___GFP_NOLOCKDEP_BIT,
#endif
___GFP_NO_OBJ_EXT_BIT,
___GFP_LAST_BIT
};
@ -96,7 +95,6 @@ enum {
#else
#define ___GFP_NOLOCKDEP 0
#endif
#define ___GFP_NO_OBJ_EXT BIT(___GFP_NO_OBJ_EXT_BIT)
/*
* Physical address zone modifiers (see linux/mmzone.h - low four bits)
@ -138,17 +136,12 @@ enum {
*
* %__GFP_ACCOUNT causes the allocation to be accounted to the active
* cgroup context.
*
* %__GFP_NO_OBJ_EXT causes slab allocation to have no object extension.
* mark_obj_codetag_empty() should be called upon freeing for objects allocated
* with this flag to indicate that their NULL tags are expected and normal.
*/
#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

10
include/trace/events/mmflags.h
View File

@ -54,18 +54,10 @@
# define TRACE_GFP_FLAGS_LOCKDEP
#endif
#ifdef CONFIG_SLAB_OBJ_EXT
# define TRACE_GFP_FLAGS_SLAB \
TRACE_GFP_EM(NO_OBJ_EXT)
#else
# define TRACE_GFP_FLAGS_SLAB
#endif
#define TRACE_GFP_FLAGS \
TRACE_GFP_FLAGS_GENERAL \
TRACE_GFP_FLAGS_KASAN \
TRACE_GFP_FLAGS_LOCKDEP \
TRACE_GFP_FLAGS_SLAB
TRACE_GFP_FLAGS_LOCKDEP
#undef TRACE_GFP_EM
#define TRACE_GFP_EM(a) TRACE_DEFINE_ENUM(___GFP_##a##_BIT);

7
tools/include/linux/gfp_types.h
View File

@ -55,7 +55,6 @@ enum {
#ifdef CONFIG_LOCKDEP
___GFP_NOLOCKDEP_BIT,
#endif
___GFP_NO_OBJ_EXT_BIT,
___GFP_LAST_BIT
};
@ -96,7 +95,6 @@ enum {
#else
#define ___GFP_NOLOCKDEP 0
#endif
#define ___GFP_NO_OBJ_EXT BIT(___GFP_NO_OBJ_EXT_BIT)
/*
* Physical address zone modifiers (see linux/mmzone.h - low four bits)
@ -137,17 +135,12 @@ enum {
* 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.
* mark_obj_codetag_empty() should be called upon freeing for objects allocated
* with this flag to indicate that their NULL tags are expected and normal.
*/
#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