mm/shmem.c: suppress shift warning

mm/shmem.c:1948 shmem_getpage_gfp() warn: should '(((1) << 12) / 512) << folio_order(folio)' be a 64 bit type?

On i386, so an unsigned long is 32-bit, but i_blocks is a 64-bit blkcnt_t.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Jessica Clarke <jrtc27@jrtc27.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/shmem.c b/mm/shmem.c
index 54149ce..c24f684 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1945,7 +1945,7 @@ alloc_nohuge:
 
        spin_lock_irq(&info->lock);
        info->alloced += folio_nr_pages(folio);
-       inode->i_blocks += BLOCKS_PER_PAGE << folio_order(folio);
+       inode->i_blocks += (blkcnt_t)BLOCKS_PER_PAGE << folio_order(folio);
        shmem_recalc_inode(inode);
        spin_unlock_irq(&info->lock);
        alloced = true;