Some in-tree drivers may use big bio which size is more than BIO_MAX_SIZE, also the macro is seldom used in tree.
So mark it as obsolete now, and it doesn't make sense after multipage bvec is introduced. Signed-off-by: Ming Lei <ming....@canonical.com> --- include/linux/bio.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/include/linux/bio.h b/include/linux/bio.h index fb59a06..b284595 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -41,6 +41,13 @@ #endif #define BIO_MAX_PAGES 256 + +/* + * This is obsolete now and shouldn't be used, and the macro + * doesn't make any sense especially when multipage bvecs is + * supported. Even now some drivers may pass big bio which size + * is more than the value, such as bcache. + */ #define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_SHIFT) /* -- 1.9.1
