* mm/mmap.c:939:11: error: variable 'next' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
@ 2023-03-23 7:58 Naresh Kamboju
2023-03-23 9:43 ` Vlastimil Babka
0 siblings, 1 reply; 2+ messages in thread
From: Naresh Kamboju @ 2023-03-23 7:58 UTC (permalink / raw)
To: Linux-Next Mailing List, open list, llvm, linux-mm
Following multiple build warnings / errors noticed while building
Linux next-20230323 with clang-16 for x86_64.
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Build warnings / errors:
---------
mm/mmap.c:939:11: error: variable 'next' is used uninitialized
whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
else if (!curr)
^~~~~
mm/mmap.c:952:15: note: uninitialized use occurs here
merge_next = next && mpol_equal(policy, vma_policy(next)) &&
^~~~
mm/mmap.c:939:7: note: remove the 'if' if its condition is always true
else if (!curr)
^~~~~~~~~~
mm/mmap.c:912:36: note: initialize the variable 'next' to silence this warning
struct vm_area_struct *curr, *next, *res;
^
= NULL
1 error generated.
make[3]: *** [scripts/Makefile.build:252: mm/mmap.o] Error 1
mm/vmalloc.c:3543:6: error: variable 'remains' is used uninitialized
whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (bitmap_empty(vb->used_map, VMAP_BBMAP_BITS)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mm/vmalloc.c:3587:17: note: uninitialized use occurs here
return count - remains + zero_iter(iter, remains);
^~~~~~~
mm/vmalloc.c:3543:2: note: remove the 'if' if its condition is always false
if (bitmap_empty(vb->used_map, VMAP_BBMAP_BITS)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mm/vmalloc.c:3539:6: error: variable 'remains' is used uninitialized
whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (!vb)
^~~
mm/vmalloc.c:3587:17: note: uninitialized use occurs here
return count - remains + zero_iter(iter, remains);
^~~~~~~
mm/vmalloc.c:3539:2: note: remove the 'if' if its condition is always false
if (!vb)
^~~~~~~~
mm/vmalloc.c:3524:16: note: initialize the variable 'remains' to
silence this warning
size_t remains, n;
^
= 0
2 errors generated.
make[3]: *** [scripts/Makefile.build:252: mm/vmalloc.o] Error 1
make[3]: Target 'mm/' not remade because of errors.
steps to reproduce:
----------
tuxmake \
--runtime podman \
--target-arch x86_64 \
--toolchain clang-16 LLVM=1 LLVM_IAS=1 \
--kconfig https://storage.tuxsuite.com/public/linaro/lkft/builds/2NOjxURhByyb4dR3Ld788iuYvAR/config
Related discussion on mailing list,
- https://lore.kernel.org/llvm/202303231055.DeninwHS-lkp@intel.com/
- https://lore.kernel.org/llvm/14c60785-2427-45db-9613-683410ff6802@lucifer.local/T/#t
--
Linaro LKFT
https://lkft.linaro.org
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: mm/mmap.c:939:11: error: variable 'next' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
2023-03-23 7:58 mm/mmap.c:939:11: error: variable 'next' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized] Naresh Kamboju
@ 2023-03-23 9:43 ` Vlastimil Babka
0 siblings, 0 replies; 2+ messages in thread
From: Vlastimil Babka @ 2023-03-23 9:43 UTC (permalink / raw)
To: Naresh Kamboju, Linux-Next Mailing List, open list, llvm,
linux-mm, Lorenzo Stoakes, Andrew Morton
On 3/23/23 08:58, Naresh Kamboju wrote:
> Following multiple build warnings / errors noticed while building
> Linux next-20230323 with clang-16 for x86_64.
>
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
>
> Build warnings / errors:
> ---------
> mm/mmap.c:939:11: error: variable 'next' is used uninitialized
> whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
> else if (!curr)
> ^~~~~
> mm/mmap.c:952:15: note: uninitialized use occurs here
> merge_next = next && mpol_equal(policy, vma_policy(next)) &&
> ^~~~
> mm/mmap.c:939:7: note: remove the 'if' if its condition is always true
> else if (!curr)
> ^~~~~~~~~~
> mm/mmap.c:912:36: note: initialize the variable 'next' to silence this warning
> struct vm_area_struct *curr, *next, *res;
> ^
> = NULL
Same issue as https://lore.kernel.org/all/CA%2BG9fYvBxp38KEggtvtvVtGMaSBdL3NDV9ns%3DZi9-Jtx7H9g1A@mail.gmail.com/
Thus already resolved in the next -next hopefully.
> 1 error generated.
> make[3]: *** [scripts/Makefile.build:252: mm/mmap.o] Error 1
>
> mm/vmalloc.c:3543:6: error: variable 'remains' is used uninitialized
> whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
> if (bitmap_empty(vb->used_map, VMAP_BBMAP_BITS)) {
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> mm/vmalloc.c:3587:17: note: uninitialized use occurs here
> return count - remains + zero_iter(iter, remains);
> ^~~~~~~
> mm/vmalloc.c:3543:2: note: remove the 'if' if its condition is always false
> if (bitmap_empty(vb->used_map, VMAP_BBMAP_BITS)) {
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> mm/vmalloc.c:3539:6: error: variable 'remains' is used uninitialized
> whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
> if (!vb)
> ^~~
> mm/vmalloc.c:3587:17: note: uninitialized use occurs here
> return count - remains + zero_iter(iter, remains);
> ^~~~~~~
> mm/vmalloc.c:3539:2: note: remove the 'if' if its condition is always false
> if (!vb)
> ^~~~~~~~
> mm/vmalloc.c:3524:16: note: initialize the variable 'remains' to
> silence this warning
> size_t remains, n;
> ^
> = 0
> 2 errors generated.
> make[3]: *** [scripts/Makefile.build:252: mm/vmalloc.o] Error 1
> make[3]: Target 'mm/' not remade because of errors.
>
> steps to reproduce:
> ----------
>
> tuxmake \
> --runtime podman \
> --target-arch x86_64 \
> --toolchain clang-16 LLVM=1 LLVM_IAS=1 \
> --kconfig https://storage.tuxsuite.com/public/linaro/lkft/builds/2NOjxURhByyb4dR3Ld788iuYvAR/config
>
> Related discussion on mailing list,
> - https://lore.kernel.org/llvm/202303231055.DeninwHS-lkp@intel.com/
> - https://lore.kernel.org/llvm/14c60785-2427-45db-9613-683410ff6802@lucifer.local/T/#t
>
>
> --
> Linaro LKFT
> https://lkft.linaro.org
>
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2023-03-23 9:43 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-03-23 7:58 mm/mmap.c:939:11: error: variable 'next' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized] Naresh Kamboju
2023-03-23 9:43 ` Vlastimil Babka
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).