netdev - Re: [linux-next:master] BUILD REGRESSION 8cb8311e95e3bb58bd84d6350365f14a718faa6d

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Date:   Wed, 25 May 2022 15:20:06 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Jessica Clarke <jrtc27@...c27.com>
Cc:     kernel test robot <lkp@...el.com>,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-riscv@...ts.infradead.org,
        linux-rdma@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-parport@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-mm@...ck.org, linux-fbdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, bpf@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, alsa-devel@...a-project.org
Subject: Re: [linux-next:master] BUILD REGRESSION
 8cb8311e95e3bb58bd84d6350365f14a718faa6d

On Wed, 25 May 2022 23:07:35 +0100 Jessica Clarke <jrtc27@...c27.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;
_