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mm: enumerate all gfp flags 

Introduce GFP bits enumeration to let compiler track the number of used
bits (which depends on the config options) instead of hardcoding them. 
That simplifies __GFP_BITS_SHIFT calculation.

Link: https://lkml.kernel.org/r/20240224015800.2569851-1-surenb@google.com
Suggested-by: Petr Tesařík <petr@tesarici.cz>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Petr Tesarik <petr@tesarici.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Suren Baghdasaryan 2024-02-23 17:58:00 -08:00 committed by Andrew Morton
parent 2864f3d0f5
commit 772dd03427
1 changed files with 64 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

94
include/linux/gfp_types.h
View File

@ -21,44 +21,78 @@ typedef unsigned int __bitwise gfp_t;
* include/trace/events/mmflags.h and tools/perf/builtin-kmem.c
*/
/* Plain integer GFP bitmasks. Do not use this directly. */
#define ___GFP_DMA 0x01u
#define ___GFP_HIGHMEM 0x02u
#define ___GFP_DMA32 0x04u
#define ___GFP_MOVABLE 0x08u
#define ___GFP_RECLAIMABLE 0x10u
#define ___GFP_HIGH 0x20u
#define ___GFP_IO 0x40u
#define ___GFP_FS 0x80u
#define ___GFP_ZERO 0x100u
/* 0x200u unused */
#define ___GFP_DIRECT_RECLAIM 0x400u
#define ___GFP_KSWAPD_RECLAIM 0x800u
#define ___GFP_WRITE 0x1000u
#define ___GFP_NOWARN 0x2000u
#define ___GFP_RETRY_MAYFAIL 0x4000u
#define ___GFP_NOFAIL 0x8000u
#define ___GFP_NORETRY 0x10000u
#define ___GFP_MEMALLOC 0x20000u
#define ___GFP_COMP 0x40000u
#define ___GFP_NOMEMALLOC 0x80000u
#define ___GFP_HARDWALL 0x100000u
#define ___GFP_THISNODE 0x200000u
#define ___GFP_ACCOUNT 0x400000u
#define ___GFP_ZEROTAGS 0x800000u
enum {
___GFP_DMA_BIT,
___GFP_HIGHMEM_BIT,
___GFP_DMA32_BIT,
___GFP_MOVABLE_BIT,
___GFP_RECLAIMABLE_BIT,
___GFP_HIGH_BIT,
___GFP_IO_BIT,
___GFP_FS_BIT,
___GFP_ZERO_BIT,
___GFP_UNUSED_BIT, /* 0x200u unused */
___GFP_DIRECT_RECLAIM_BIT,
___GFP_KSWAPD_RECLAIM_BIT,
___GFP_WRITE_BIT,
___GFP_NOWARN_BIT,
___GFP_RETRY_MAYFAIL_BIT,
___GFP_NOFAIL_BIT,
___GFP_NORETRY_BIT,
___GFP_MEMALLOC_BIT,
___GFP_COMP_BIT,
___GFP_NOMEMALLOC_BIT,
___GFP_HARDWALL_BIT,
___GFP_THISNODE_BIT,
___GFP_ACCOUNT_BIT,
___GFP_ZEROTAGS_BIT,
#ifdef CONFIG_KASAN_HW_TAGS
#define ___GFP_SKIP_ZERO 0x1000000u
#define ___GFP_SKIP_KASAN 0x2000000u
___GFP_SKIP_ZERO_BIT,
___GFP_SKIP_KASAN_BIT,
#endif
#ifdef CONFIG_LOCKDEP
___GFP_NOLOCKDEP_BIT,
#endif
___GFP_LAST_BIT
};
/* Plain integer GFP bitmasks. Do not use this directly. */
#define ___GFP_DMA BIT(___GFP_DMA_BIT)
#define ___GFP_HIGHMEM BIT(___GFP_HIGHMEM_BIT)
#define ___GFP_DMA32 BIT(___GFP_DMA32_BIT)
#define ___GFP_MOVABLE BIT(___GFP_MOVABLE_BIT)
#define ___GFP_RECLAIMABLE BIT(___GFP_RECLAIMABLE_BIT)
#define ___GFP_HIGH BIT(___GFP_HIGH_BIT)
#define ___GFP_IO BIT(___GFP_IO_BIT)
#define ___GFP_FS BIT(___GFP_FS_BIT)
#define ___GFP_ZERO BIT(___GFP_ZERO_BIT)
/* 0x200u unused */
#define ___GFP_DIRECT_RECLAIM BIT(___GFP_DIRECT_RECLAIM_BIT)
#define ___GFP_KSWAPD_RECLAIM BIT(___GFP_KSWAPD_RECLAIM_BIT)
#define ___GFP_WRITE BIT(___GFP_WRITE_BIT)
#define ___GFP_NOWARN BIT(___GFP_NOWARN_BIT)
#define ___GFP_RETRY_MAYFAIL BIT(___GFP_RETRY_MAYFAIL_BIT)
#define ___GFP_NOFAIL BIT(___GFP_NOFAIL_BIT)
#define ___GFP_NORETRY BIT(___GFP_NORETRY_BIT)
#define ___GFP_MEMALLOC BIT(___GFP_MEMALLOC_BIT)
#define ___GFP_COMP BIT(___GFP_COMP_BIT)
#define ___GFP_NOMEMALLOC BIT(___GFP_NOMEMALLOC_BIT)
#define ___GFP_HARDWALL BIT(___GFP_HARDWALL_BIT)
#define ___GFP_THISNODE BIT(___GFP_THISNODE_BIT)
#define ___GFP_ACCOUNT BIT(___GFP_ACCOUNT_BIT)
#define ___GFP_ZEROTAGS BIT(___GFP_ZEROTAGS_BIT)
#ifdef CONFIG_KASAN_HW_TAGS
#define ___GFP_SKIP_ZERO BIT(___GFP_SKIP_ZERO_BIT)
#define ___GFP_SKIP_KASAN BIT(___GFP_SKIP_KASAN_BIT)
#else
#define ___GFP_SKIP_ZERO 0
#define ___GFP_SKIP_KASAN 0
#endif
#ifdef CONFIG_LOCKDEP
#define ___GFP_NOLOCKDEP 0x4000000u
#define ___GFP_NOLOCKDEP BIT(___GFP_NOLOCKDEP_BIT)
#else
#define ___GFP_NOLOCKDEP 0
#endif
/* If the above are modified, __GFP_BITS_SHIFT may need updating */
/*
* Physical address zone modifiers (see linux/mmzone.h - low four bits)
@ -249,7 +283,7 @@ typedef unsigned int __bitwise gfp_t;
#define __GFP_NOLOCKDEP ((__force gfp_t)___GFP_NOLOCKDEP)
/* Room for N __GFP_FOO bits */
#define __GFP_BITS_SHIFT (26 + IS_ENABLED(CONFIG_LOCKDEP))
#define __GFP_BITS_SHIFT ___GFP_LAST_BIT
#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
/**