From 2630628b2dbc3fc320aafaf84836119e4e3d62f1 Mon Sep 17 00:00:00 2001 From: Lars Ellenberg Date: Fri, 20 Mar 2015 15:47:22 +0100 Subject: [PATCH] drbd: avoid redefinition of BITS_PER_PAGE Apparently we now implicitly get definitions for BITS_PER_PAGE and BITS_PER_PAGE_MASK from the pid_namespace.h Instead of renaming our defines, I chose to define only if not yet defined, but to double check the value if already defined. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg Signed-off-by: Jens Axboe --- drivers/block/drbd/drbd_bitmap.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c index 9462d2752850..8bdc34dbaedf 100644 --- a/drivers/block/drbd/drbd_bitmap.c +++ b/drivers/block/drbd/drbd_bitmap.c @@ -479,8 +479,14 @@ void drbd_bm_cleanup(struct drbd_device *device) * this masks out the remaining bits. * Returns the number of bits cleared. */ +#ifndef BITS_PER_PAGE #define BITS_PER_PAGE (1UL << (PAGE_SHIFT + 3)) #define BITS_PER_PAGE_MASK (BITS_PER_PAGE - 1) +#else +# if BITS_PER_PAGE != (1UL << (PAGE_SHIFT + 3)) +# error "ambiguous BITS_PER_PAGE" +# endif +#endif #define BITS_PER_LONG_MASK (BITS_PER_LONG - 1) static int bm_clear_surplus(struct drbd_bitmap *b) { -- 2.20.1