From: Andrew Morton <akpm@linux-foundation.org>
Date: Wed, 25 May 2022 22:17:09 +0000 (-0700)
Subject: mm/shmem.c: suppress shift warning
X-Git-Tag: for-5.19/block-exec-2022-06-02~9^2
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=fa020a2b87d24016723fff4a4237deb612478a32;p=linux-block.git

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 54149ce679be..c24f684022fd 100644
--- 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;