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| author | Qi Zheng <zhengqi.arch@bytedance.com> | 2022-05-20 00:08:55 +0300 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-05-20 00:08:55 +0300 |
| commit | 3f913fc5f9745613088d3c569778c9813ab9c129 (patch) | |
| tree | c2b292958bd1ba0306f28daf2a3640b6bd4e54b4 /mm/internal.h | |
| parent | 10e0f7530205799e7e971aba699a7cb3a47456de (diff) | |
| download | linux-3f913fc5f9745613088d3c569778c9813ab9c129.tar.xz | |
mm: fix missing handler for __GFP_NOWARN
We expect no warnings to be issued when we specify __GFP_NOWARN, but
currently in paths like alloc_pages() and kmalloc(), there are still some
warnings printed, fix it.
But for some warnings that report usage problems, we don't deal with them.
If such warnings are printed, then we should fix the usage problems.
Such as the following case:
WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1));
[zhengqi.arch@bytedance.com: v2]
Link: https://lkml.kernel.org/r/20220511061951.1114-1-zhengqi.arch@bytedance.com
Link: https://lkml.kernel.org/r/20220510113809.80626-1-zhengqi.arch@bytedance.com
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jirislaby@kernel.org>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
| -rw-r--r-- | mm/internal.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/mm/internal.h b/mm/internal.h index 6d188161b20e..64e61b032dac 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -35,6 +35,21 @@ struct folio_batch; /* Do not use these with a slab allocator */ #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) +/* + * Different from WARN_ON_ONCE(), no warning will be issued + * when we specify __GFP_NOWARN. + */ +#define WARN_ON_ONCE_GFP(cond, gfp) ({ \ + static bool __section(".data.once") __warned; \ + int __ret_warn_once = !!(cond); \ + \ + if (unlikely(!(gfp & __GFP_NOWARN) && __ret_warn_once && !__warned)) { \ + __warned = true; \ + WARN_ON(1); \ + } \ + unlikely(__ret_warn_once); \ +}) + void page_writeback_init(void); static inline void *folio_raw_mapping(struct folio *folio) |