Enabling CONFIG_UBSAN_SANITIZE_ALL on ARM caused a link error: last_lba.part.0': :(.text+0xc3440): undefined reference to `____ilog2_NaN' :(.text+0xc3538): undefined reference to `__aeabi_uldivmod' :(.text+0xc38e8): undefined reference to `__aeabi_uldivmod'
This is caused by gcc not behaving in the expected ways with __builtin_constant_p(), but it also points to somewhat inefficient code based on a 64-bit division. I have introduced a better bdev_logical_block_count() now, so we can use that here. Signed-off-by: Arnd Bergmann <[email protected]> --- block/partitions/efi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/block/partitions/efi.c b/block/partitions/efi.c index bcd86e5cd546..7b1a62073d34 100644 --- a/block/partitions/efi.c +++ b/block/partitions/efi.c @@ -149,8 +149,8 @@ static u64 last_lba(struct block_device *bdev) { if (!bdev || !bdev->bd_inode) return 0; - return div_u64(bdev->bd_inode->i_size, - bdev_logical_block_size(bdev)) - 1ULL; + + return bdev_logical_block_count(bdev) - 1; } static inline int pmbr_part_valid(gpt_mbr_record *part) -- 2.9.0
