On Wed, 25 May 2022 23:07:35 +0100 Jessica Clarke <jrt...@jrtc27.com> wrote:
> This is i386, so an unsigned long is 32-bit, but i_blocks is a blkcnt_t
> i.e. a u64, which makes the shift without a cast of the LHS fishy.
Ah, of course, thanks. I remember 32 bits ;)
--- a/mm/shmem.c~mm-shmemc-suppress-shift-warning
+++ a/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;
_
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