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Subjectlinux-next: build warning after merge of the btrfs tree
Hi all,

After merging the btrfs tree, today's linux-next build (powerpc
ppc64_defconfig) produced this warning:

fs/btrfs/volumes.c: In function 'btrfs_scratch_superblocks':
fs/btrfs/volumes.c:7338:3: warning: ignoring return value of 'write_one_page', declared with attribute warn_unused_result [-Wunused-result]
7338 | write_one_page(page);
| ^~~~~~~~~~~~~~~~~~~~

Introduced by commit

d19ec014a46b ("btrfs: use the page-cache for super block reading")

Stephen Rothwell
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