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Date: Thu, 22 Feb 2024 13:12:29 +0100
From: Michal Hocko <mhocko@...e.com>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: akpm@...ux-foundation.org, kent.overstreet@...ux.dev, vbabka@...e.cz,
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Petr Tesařík <petr@...arici.cz>
Subject: Re: [PATCH v4 06/36] mm: enumerate all gfp flags
On Wed 21-02-24 11:40:19, Suren Baghdasaryan wrote:
> 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.
>
> Suggested-by: Petr Tesařík <petr@...arici.cz>
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
> Reviewed-by: Kees Cook <keescook@...omium.org>
I thought I have responded to this patch but obviously not the case.
I like this change. Makes sense even without the rest of the series.
Acked-by: Michal Hocko <mhocko@...e.com>
It seems that KASAN flags already __GFP_BITS_SHIFT which just proves how
fragile this existing scheme is.
> ---
> include/linux/gfp_types.h | 90 +++++++++++++++++++++++++++------------
> 1 file changed, 62 insertions(+), 28 deletions(-)
>
> diff --git a/include/linux/gfp_types.h b/include/linux/gfp_types.h
> index 1b6053da8754..868c8fb1bbc1 100644
> --- a/include/linux/gfp_types.h
> +++ b/include/linux/gfp_types.h
> @@ -21,44 +21,78 @@ typedef unsigned int __bitwise gfp_t;
> * include/trace/events/mmflags.h and tools/perf/builtin-kmem.c
> */
>
> +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
> + ___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 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
> +#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 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
> +#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 0x1000000u
> -#define ___GFP_SKIP_KASAN 0x2000000u
> +#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))
>
> /**
> --
> 2.44.0.rc0.258.g7320e95886-goog
--
Michal Hocko
SUSE Labs
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