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Kees Cook d68627697d treewide: Remove uninitialized_var() usage 
commit 3f649ab728 upstream.

Using uninitialized_var() is dangerous as it papers over real bugs[1]
(or can in the future), and suppresses unrelated compiler warnings
(e.g. "unused variable"). If the compiler thinks it is uninitialized,
either simply initialize the variable or make compiler changes.

In preparation for removing[2] the[3] macro[4], remove all remaining
needless uses with the following script:

git grep '\buninitialized_var\b' | cut -d: -f1 | sort -u | \
	xargs perl -pi -e \
		's/\buninitialized_var\(([^\)]+)\)/\1/g;
		 s:\s*/\* (GCC be quiet|to make compiler happy) \*/$::g;'

drivers/video/fbdev/riva/riva_hw.c was manually tweaked to avoid
pathological white-space.

No outstanding warnings were found building allmodconfig with GCC 9.3.0
for x86_64, i386, arm64, arm, powerpc, powerpc64le, s390x, mips, sparc64,
alpha, and m68k.

[1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/
[2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/
[3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/
[4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/

Reviewed-by: Leon Romanovsky <leonro@mellanox.com> # drivers/infiniband and mlx4/mlx5
Acked-by: Jason Gunthorpe <jgg@mellanox.com> # IB
Acked-by: Kalle Valo <kvalo@codeaurora.org> # wireless drivers
Reviewed-by: Chao Yu <yuchao0@huawei.com> # erofs
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-08-11 11:33:32 +02:00
..
kasan panic: Consolidate open-coded panic_on_warn checks 2023-02-06 07:46:34 +01:00
backing-dev.c mm: bdi: initialize bdi_min_ratio when bdi is unregistered 2021-12-14 10:16:54 +01:00
balloon_compaction.c virtio_balloon: fix deadlock on OOM 2018-10-13 09:27:30 +02:00
bootmem.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cleancache.c fs: switch ->s_uuid to uuid_t 2017-06-05 16:59:12 +02:00
cma_debug.c mm/cma_debug.c: fix the break condition in cma_maxchunk_get() 2019-06-15 11:54:51 +02:00
cma.c mm/cma.c: fail if fixed declaration can't be honored 2019-08-06 19:05:23 +02:00
cma.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compaction.c mm/compaction.c: clear total_{migrate,free}_scanned before scanning a new zone 2019-10-05 12:48:13 +02:00
debug_page_ref.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
debug.c mm: get rid of vmacache_flush_all() entirely 2018-09-19 22:43:48 +02:00
dmapool.c lib/vsprintf.c: remove %Z support 2017-02-27 18:43:47 -08:00
early_ioremap.c mm/early_ioremap: Fix boot hang with earlyprintk=efi,keep 2018-02-25 11:08:03 +01:00
fadvise.c mm/fadvise.c: fix signed overflow UBSAN complaint 2018-09-15 09:45:28 +02:00
failslab.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
filemap.c mm: fs: initialize fsdata passed to write_begin/write_end interface 2022-11-25 17:36:55 +01:00
frame_vector.c v4l2: don't fall back to follow_pfn() if pin_user_pages_fast() fails 2022-12-08 11:16:33 +01:00
frontswap.c treewide: Remove uninitialized_var() usage 2023-08-11 11:33:32 +02:00
gup.c gup: document and work around "COW can break either way" issue 2021-04-28 12:08:42 +02:00
highmem.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hmm.c mm, hmm: mark hmm_devmem_{add, add_resource} EXPORT_SYMBOL_GPL 2019-01-13 10:01:02 +01:00
huge_memory.c mm/huge_memory.c: don't discard hugepage if other processes are mapping it 2021-07-20 16:17:41 +02:00
hugetlb_cgroup.c mm: hugetlb: switch to css_tryget() in hugetlb_cgroup_charge_cgroup() 2019-11-20 17:59:33 +01:00
hugetlb.c mm,hugetlb: take hugetlb_lock before decrementing h->resv_huge_pages 2022-11-03 23:50:54 +09:00
hwpoison-inject.c mm: hwpoison: call shake_page() unconditionally 2017-05-03 15:52:12 -07:00
init-mm.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
internal.h mm/thp: fix vma_address() if virtual address below file offset 2021-07-11 12:48:10 +02:00
interval_tree.c lib/interval_tree: fast overlap detection 2017-09-08 18:26:49 -07:00
Kconfig mm/hmm: select mmu notifier when selecting HMM 2019-06-15 11:54:51 +02:00
Kconfig.debug kmemcheck: rip it out 2018-02-22 15:42:24 +01:00
khugepaged.c mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths 2023-01-18 09:26:04 +01:00
kmemleak-test.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
kmemleak.c Revert "mm: kmemleak: take a full lowmem check in kmemleak_*_phys()" 2022-09-15 12:23:51 +02:00
ksm.c treewide: Remove uninitialized_var() usage 2023-08-11 11:33:32 +02:00
list_lru.c mm/list_lru.c: fix memory leak in __memcg_init_list_lru_node 2019-06-19 08:20:54 +02:00
maccess.c uaccess: Add non-pagefault user-space write function 2020-09-09 19:03:11 +02:00
madvise.c mm: madvise(MADV_DODUMP): allow hugetlbfs pages 2018-10-10 08:54:22 +02:00
Makefile kmemcheck: rip it out 2018-02-22 15:42:24 +01:00
memblock.c memblock: use kfree() to release kmalloced memblock regions 2022-03-02 11:34:00 +01:00
memcontrol.c treewide: Remove uninitialized_var() usage 2023-08-11 11:33:32 +02:00
memory_hotplug.c mm/memory_hotplug: use "unsigned long" for PFN in zone_for_pfn_range() 2021-09-22 11:45:34 +02:00
memory-failure.c mm/memory-failure: make sure wait for page writeback in memory_failure 2021-06-30 08:48:48 -04:00
memory.c mm/khugepaged: fix GUP-fast interaction by sending IPI 2023-01-18 09:26:04 +01:00
mempolicy.c treewide: Remove uninitialized_var() usage 2023-08-11 11:33:32 +02:00
mempool.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
memtest.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
migrate.c mm/migrate_device.c: flush TLB while holding PTL 2022-10-26 13:16:50 +02:00
mincore.c mm/mincore.c: make mincore() more conservative 2019-05-21 18:50:16 +02:00
mlock.c mm/mlock.c: change count_mm_mlocked_page_nr return type 2019-07-10 09:54:36 +02:00
mm_init.c mm: convert printk(KERN_<LEVEL> to pr_<level> 2016-03-17 15:09:34 -07:00
mmap.c mm: Fix TLB flush for not-first PFNMAP mappings in unmap_region() 2022-09-20 11:51:30 +02:00
mmu_context.c sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h> 2017-03-02 08:42:38 +01:00
mmu_notifier.c mm/mmu_notifier: use hlist_add_head_rcu() 2019-07-31 07:28:56 +02:00
mmzone.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mprotect.c mm, numa: fix bad pmd by atomically check for pmd_trans_huge when marking page tables prot_numa 2020-03-11 18:03:02 +01:00
mremap.c mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0) 2022-04-20 09:08:29 +02:00
msync.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nobootmem.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nommu.c x86/mm: split vmalloc_sync_all() 2020-04-02 16:34:20 +02:00
oom_kill.c mm, oom: do not trigger out_of_memory from the #PF 2021-11-26 11:40:37 +01:00
page_alloc.c mm/page_alloc: fix potential deadlock on zonelist_update_seq seqlock 2023-05-17 11:11:51 +02:00
page_counter.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
page_ext.c mm/page_ext.c: fix an imbalance with kmemleak 2019-04-05 22:31:27 +02:00
page_idle.c mm/page_idle.c: fix oops because end_pfn is larger than max_pfn 2019-07-03 13:15:59 +02:00
page_io.c swap: fix swapfile read/write offset 2021-03-07 11:27:46 +01:00
page_isolation.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
page_owner.c mm/page_owner.c: remove drain_all_pages from init_early_allocated_pages 2020-07-31 16:44:45 +02:00
page_poison.c page_poison: play nicely with KASAN 2019-04-05 22:31:28 +02:00
page_vma_mapped.c mm/thp: another PVMW_SYNC fix in page_vma_mapped_walk() 2021-07-11 12:48:12 +02:00
page-writeback.c mm/page-writeback.c: avoid potential division by zero in wb_min_max_ratio() 2020-01-23 08:20:32 +01:00
pagewalk.c mm: pagewalk: fix termination condition in walk_pte_range() 2020-10-01 13:12:32 +02:00
percpu-internal.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
percpu-km.c percpu: convert spin_lock_irq to spin_lock_irqsave. 2019-02-12 19:46:05 +01:00
percpu-stats.c percpu: fix starting offset for chunk statistics traversal 2017-09-27 14:45:57 -07:00
percpu-vm.c percpu: add __GFP_NORETRY semantics to the percpu balancing path 2018-04-08 14:26:29 +02:00
percpu.c treewide: Remove uninitialized_var() usage 2023-08-11 11:33:32 +02:00
pgtable-generic.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
process_vm_access.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/mm.h> 2017-03-02 08:42:28 +01:00
quicklist.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
readahead.c readahead: stricter check for bdi io_pages 2018-09-09 19:55:53 +02:00
rmap.c mm/rmap: Fix anon_vma->degree ambiguity leading to double-reuse 2022-09-05 10:25:06 +02:00
rodata_test.c mm: fix RODATA_TEST failure "rodata_test: test data was not read only" 2017-10-03 17:54:24 -07:00
shmem.c memfd: fix F_SEAL_WRITE after shmem huge page allocated 2022-03-08 19:01:58 +01:00
slab_common.c mm/slab: use memzero_explicit() in kzfree() 2020-06-30 15:38:08 -04:00
slab.c mm/slab.c: fix an infinite loop in leaks_show() 2019-06-15 11:54:51 +02:00
slab.h mm: kmemleak: slob: respect SLAB_NOLEAKTRACE flag 2021-11-26 11:40:40 +01:00
slob.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
slub.c treewide: Remove uninitialized_var() usage 2023-08-11 11:33:32 +02:00
sparse-vmemmap.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sparse.c mm: sections are not offlined during memory hotremove 2018-05-16 10:10:27 +02:00
swap_cgroup.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
swap_slots.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
swap_state.c mm/swap_state: fix a data race in swapin_nr_pages 2020-10-01 13:12:46 +02:00
swap.c treewide: Remove uninitialized_var() usage 2023-08-11 11:33:32 +02:00
swapfile.c mm/swap: fix swap_info_struct race between swapoff and get_swap_pages() 2023-04-20 12:02:11 +02:00
truncate.c mm: cleancache: fix corruption on missed inode invalidation 2018-12-08 13:03:40 +01:00
usercopy.c usercopy: Avoid HIGHMEM pfn warning 2019-10-11 18:18:34 +02:00
userfaultfd.c mm: userfaultfd: fix missing cache flush in mcopy_atomic_pte() and __mcopy_atomic() 2022-05-15 19:40:27 +02:00
util.c mm: kvmalloc does not fallback to vmalloc for incompatible gfp flags 2023-02-06 07:46:35 +01:00
vmacache.c mm: get rid of vmacache_flush_all() entirely 2018-09-19 22:43:48 +02:00
vmalloc.c mm/vmalloc.c: don't dereference possible NULL pointer in __vunmap() 2020-06-03 08:18:11 +02:00
vmpressure.c mm, vmpressure: pass-through notification support 2017-07-10 16:32:31 -07:00
vmscan.c mm: memcg: make sure memory.events is uptodate when waking pollers 2021-04-07 12:47:03 +02:00
vmstat.c mm, vmstat: drop zone->lock in /proc/pagetypeinfo 2021-06-03 08:36:10 +02:00
workingset.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
z3fold.c z3fold: fix possible reclaim races 2018-12-01 09:42:54 +01:00
zbud.c mm/zbud.c: use list_last_entry() instead of list_tail_entry() 2016-01-15 11:40:52 -08:00
zpool.c mm: zsmalloc: constify struct zs_pool name 2015-11-06 17:50:42 -08:00
zsmalloc.c zsmalloc: fix races between asynchronous zspage free and page migration 2022-06-06 08:20:57 +02:00
zswap.c zswap: re-check zswap_is_full() after do zswap_shrink() 2018-09-05 09:26:30 +02:00