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authorHui Zhu2015-11-06 16:29:26 -0800
committerLinus Torvalds2015-11-06 17:50:42 -0800
commit12a7bfad58cd604616dd5205efa6dc2be6f299eb (patch)
tree29228fe2c4440e1d95eeb64a8c19ef889f9bf744 /fs/statfs.c
parent8f958c98f28d088a1ef3e021ab7aeb59a234b953 (diff)
zsmalloc: fix obj_to_head use page_private(page) as value but not pointer
In obj_malloc(): if (!class->huge) /* record handle in the header of allocated chunk */ link->handle = handle; else /* record handle in first_page->private */ set_page_private(first_page, handle); In the hugepage we save handle to private directly. But in obj_to_head(): if (class->huge) { VM_BUG_ON(!is_first_page(page)); return *(unsigned long *)page_private(page); } else return *(unsigned long *)obj; It is used as a pointer. The reason why there is no problem until now is huge-class page is born with ZS_FULL so it can't be migrated. However, we need this patch for future work: "VM-aware zsmalloced page migration" to reduce external fragmentation. Signed-off-by: Hui Zhu <zhuhui@xiaomi.com> Acked-by: Minchan Kim <minchan@kernel.org> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/statfs.c')
0 files changed, 0 insertions, 0 deletions