• Greg Kroah-Hartman's avatar
    lz4: fix bogus gcc warning · 529ada21
    Greg Kroah-Hartman authored
    When building lz4 under gcc-7 we get the following bogus warning:
    
      CC [M]  lib/lz4/lz4hc_compress.o
    lib/lz4/lz4hc_compress.c: In function ‘lz4hc_compress’:
    lib/lz4/lz4hc_compress.c:179:42: warning: ‘delta’ may be used uninitialized in this function [-Wmaybe-uninitialized]
        chaintable[(size_t)(ptr) & MAXD_MASK] = delta;
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
    lib/lz4/lz4hc_compress.c:134:6: note: ‘delta’ was declared here
      u16 delta;
          ^~~~~
    
    This doesn't show up in the 4.4-stable tree due to us turning off
    warnings like this.  It also doesn't show up in newer kernel versions as
    this code was totally rewritten.
    
    So for now, to get the 4.9-stable tree to build with 0 warnings on x86
    allmodconfig, let's just shut the compiler up by initializing the
    variable to 0, despite it not really doing anything.
    
    To be far, this code is crazy complex, so the fact that gcc can't
    determine if the variable is really used or not isn't that bad, I'd
    blame the code here instead of the compiler.
    Signed-off-by: 's avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    529ada21
Name
Last commit
Last update
..
842 Loading commit data...
fonts Loading commit data...
lz4 Loading commit data...
lzo Loading commit data...
mpi Loading commit data...
raid6 Loading commit data...
reed_solomon Loading commit data...
xz Loading commit data...
zlib_deflate Loading commit data...
zlib_inflate Loading commit data...
.gitignore Loading commit data...
Kconfig Loading commit data...
Kconfig.debug Loading commit data...
Kconfig.kasan Loading commit data...
Kconfig.kgdb Loading commit data...
Kconfig.kmemcheck Loading commit data...
Kconfig.ubsan Loading commit data...
Makefile Loading commit data...
argv_split.c Loading commit data...
asn1_decoder.c Loading commit data...
assoc_array.c Loading commit data...
atomic64.c Loading commit data...
atomic64_test.c Loading commit data...
audit.c Loading commit data...
bcd.c Loading commit data...
bch.c Loading commit data...
bitmap.c Loading commit data...
bitrev.c Loading commit data...
bsearch.c Loading commit data...
btree.c Loading commit data...
bug.c Loading commit data...
build_OID_registry Loading commit data...
bust_spinlocks.c Loading commit data...
chacha20.c Loading commit data...
check_signature.c Loading commit data...
checksum.c Loading commit data...
clz_ctz.c Loading commit data...
clz_tab.c Loading commit data...
cmdline.c Loading commit data...
compat_audit.c Loading commit data...
cordic.c Loading commit data...
cpu-notifier-error-inject.c Loading commit data...
cpu_rmap.c Loading commit data...
cpumask.c Loading commit data...
crc-ccitt.c Loading commit data...
crc-itu-t.c Loading commit data...
crc-t10dif.c Loading commit data...
crc16.c Loading commit data...
crc32.c Loading commit data...
crc32defs.h Loading commit data...
crc7.c Loading commit data...
crc8.c Loading commit data...
ctype.c Loading commit data...
debug_info.c Loading commit data...
debug_locks.c Loading commit data...
debugobjects.c Loading commit data...
dec_and_lock.c Loading commit data...
decompress.c Loading commit data...
decompress_bunzip2.c Loading commit data...
decompress_inflate.c Loading commit data...
decompress_unlz4.c Loading commit data...
decompress_unlzma.c Loading commit data...
decompress_unlzo.c Loading commit data...
decompress_unxz.c Loading commit data...
devres.c Loading commit data...
digsig.c Loading commit data...
div64.c Loading commit data...
dma-debug.c Loading commit data...
dma-noop.c Loading commit data...
dump_stack.c Loading commit data...
dynamic_debug.c Loading commit data...
dynamic_queue_limits.c Loading commit data...
earlycpio.c Loading commit data...
extable.c Loading commit data...
fault-inject.c Loading commit data...
fdt.c Loading commit data...
fdt_empty_tree.c Loading commit data...
fdt_ro.c Loading commit data...
fdt_rw.c Loading commit data...
fdt_strerror.c Loading commit data...
fdt_sw.c Loading commit data...
fdt_wip.c Loading commit data...
find_bit.c Loading commit data...
flex_array.c Loading commit data...
flex_proportions.c Loading commit data...
gcd.c Loading commit data...
gen_crc32table.c Loading commit data...
genalloc.c Loading commit data...
glob.c Loading commit data...
halfmd4.c Loading commit data...
hexdump.c Loading commit data...
hweight.c Loading commit data...
idr.c Loading commit data...
inflate.c Loading commit data...
int_sqrt.c Loading commit data...
interval_tree.c Loading commit data...
interval_tree_test.c Loading commit data...
iomap.c Loading commit data...
iomap_copy.c Loading commit data...
iommu-common.c Loading commit data...
iommu-helper.c Loading commit data...
ioremap.c Loading commit data...
iov_iter.c Loading commit data...
irq_poll.c Loading commit data...
irq_regs.c Loading commit data...
is_single_threaded.c Loading commit data...
jedec_ddr_data.c Loading commit data...
kasprintf.c Loading commit data...
kfifo.c Loading commit data...
klist.c Loading commit data...
kobject.c Loading commit data...
kobject_uevent.c Loading commit data...
kstrtox.c Loading commit data...
kstrtox.h Loading commit data...
lcm.c Loading commit data...
libcrc32c.c Loading commit data...
list_debug.c Loading commit data...
list_sort.c Loading commit data...
llist.c Loading commit data...
locking-selftest-hardirq.h Loading commit data...
locking-selftest-mutex.h Loading commit data...
locking-selftest-rlock-hardirq.h Loading commit data...
locking-selftest-rlock-softirq.h Loading commit data...
locking-selftest-rlock.h Loading commit data...
locking-selftest-rsem.h Loading commit data...
locking-selftest-softirq.h Loading commit data...
locking-selftest-spin-hardirq.h Loading commit data...
locking-selftest-spin-softirq.h Loading commit data...
locking-selftest-spin.h Loading commit data...
locking-selftest-wlock-hardirq.h Loading commit data...
locking-selftest-wlock-softirq.h Loading commit data...
locking-selftest-wlock.h Loading commit data...
locking-selftest-wsem.h Loading commit data...
locking-selftest.c Loading commit data...
lockref.c Loading commit data...
lru_cache.c Loading commit data...
md5.c Loading commit data...
memory-notifier-error-inject.c Loading commit data...
memweight.c Loading commit data...
net_utils.c Loading commit data...
netdev-notifier-error-inject.c Loading commit data...
nlattr.c Loading commit data...
nmi_backtrace.c Loading commit data...
nodemask.c Loading commit data...
notifier-error-inject.c Loading commit data...
notifier-error-inject.h Loading commit data...
of-reconfig-notifier-error-inject.c Loading commit data...
oid_registry.c Loading commit data...
once.c Loading commit data...
parser.c Loading commit data...
pci_iomap.c Loading commit data...
percpu-refcount.c Loading commit data...
percpu_counter.c Loading commit data...
percpu_ida.c Loading commit data...
percpu_test.c Loading commit data...
plist.c Loading commit data...
pm-notifier-error-inject.c Loading commit data...
radix-tree.c Loading commit data...
random32.c Loading commit data...
ratelimit.c Loading commit data...
rational.c Loading commit data...
rbtree.c Loading commit data...
rbtree_test.c Loading commit data...
reciprocal_div.c Loading commit data...
rhashtable.c Loading commit data...
sbitmap.c Loading commit data...
scatterlist.c Loading commit data...
seq_buf.c Loading commit data...
sg_pool.c Loading commit data...
sg_split.c Loading commit data...
sha1.c Loading commit data...
show_mem.c Loading commit data...
smp_processor_id.c Loading commit data...
sort.c Loading commit data...
stackdepot.c Loading commit data...
stmp_device.c Loading commit data...
string.c Loading commit data...
string_helpers.c Loading commit data...
strncpy_from_user.c Loading commit data...
strnlen_user.c Loading commit data...
swiotlb.c Loading commit data...
syscall.c Loading commit data...
test-kstrtox.c Loading commit data...
test-string_helpers.c Loading commit data...
test_bitmap.c Loading commit data...
test_bpf.c Loading commit data...
test_firmware.c Loading commit data...
test_hash.c Loading commit data...
test_hexdump.c Loading commit data...
test_kasan.c Loading commit data...
test_module.c Loading commit data...
test_printf.c Loading commit data...
test_rhashtable.c Loading commit data...
test_static_key_base.c Loading commit data...
test_static_keys.c Loading commit data...
test_user_copy.c Loading commit data...
test_uuid.c Loading commit data...
textsearch.c Loading commit data...
timerqueue.c Loading commit data...
ts_bm.c Loading commit data...
ts_fsm.c Loading commit data...
ts_kmp.c Loading commit data...
ubsan.c Loading commit data...
ubsan.h Loading commit data...
ucs2_string.c Loading commit data...
uuid.c Loading commit data...
vsprintf.c Loading commit data...
win_minmax.c Loading commit data...