include/linux/mm_types.h: ifdef struct vm_area_struct::swap_readahead_info
The field is only used in swap code. Link: http://lkml.kernel.org/r/20190503190500.GA30589@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -329,7 +329,9 @@ struct vm_area_struct {
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struct file * vm_file; /* File we map to (can be NULL). */
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void * vm_private_data; /* was vm_pte (shared mem) */
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#ifdef CONFIG_SWAP
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atomic_long_t swap_readahead_info;
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#endif
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#ifndef CONFIG_MMU
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struct vm_region *vm_region; /* NOMMU mapping region */
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#endif
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