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 <[email protected]> Reported-by: Jessica Clarke <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
ambv · May 27, 2022 · fa020a2 · fa020a2
1 parent 0710d01
commit fa020a2
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/mm/shmem.c b/mm/shmem.c
@@ -1945,7 +1945,7 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t index,
 
 	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;