The patch titled Subject: drivers/block/null_blk_main.c: fix uninitialized var warnings has been added to the -mm tree. Its filename is drivers-block-null_blk_mainc-fix-uninitialized-var-warnings.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/drivers-block-null_blk_mainc-fix-uninitialized-var-warnings.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/drivers-block-null_blk_mainc-fix-uninitialized-var-warnings.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Subject: drivers/block/null_blk_main.c: fix uninitialized var warnings With gcc-7.2, many instances of drivers/block/null_blk_main.c: In function ‘nullb_device_zone_nr_conv_store’: drivers/block/null_blk_main.c:291:12: warning: ‘new_value’ may be used uninitialized in this function [-Wmaybe-uninitialized] dev->NAME = new_value; \ ^ drivers/block/null_blk_main.c:279:7: note: ‘new_value’ was declared here TYPE new_value; \ ^ Presumably notabug, so use uninitialized_var() to suppress them. Cc: Shaohua Li <shli@xxxxxx> Cc: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/block/null_blk_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/block/null_blk_main.c~drivers-block-null_blk_mainc-fix-uninitialized-var-warnings +++ a/drivers/block/null_blk_main.c @@ -276,7 +276,7 @@ nullb_device_##NAME##_store(struct confi { \ int (*apply_fn)(struct nullb_device *dev, TYPE new_value) = APPLY;\ struct nullb_device *dev = to_nullb_device(item); \ - TYPE new_value; \ + TYPE uninitialized_var(new_value); \ int ret; \ \ ret = nullb_device_##TYPE##_attr_store(&new_value, page, count);\ _ Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are mm-slub-fix-a-deadlock-in-show_slab_objects-fix.patch ocfs2-protect-extent-tree-in-the-ocfs2_prepare_inode_for_write-checkpatch-fixes.patch mm.patch mm-pgmap-use-correct-alignment-when-looking-at-first-pfn-from-a-region-checkpatch-fixes.patch mm-oom-avoid-printk-iteration-under-rcu-fix.patch hugetlb-remove-duplicated-code-checkpatch-fixes.patch hugetlb-remove-unused-hstate-in-hugetlb_fault_mutex_hash-fix.patch mm-annotate-refault-stalls-from-swap_readpage-fix.patch linux-next-git-rejects.patch diff-sucks.patch samples-watch_queue-watch_test-fix-build.patch drivers-block-null_blk_mainc-fix-layout.patch drivers-block-null_blk_mainc-fix-uninitialized-var-warnings.patch drivers-tty-serial-sh-scic-suppress-warning.patch kernel-forkc-export-kernel_thread-to-modules.patch