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author | Yury Norov <yury.norov@gmail.com> | 2023-07-17 12:17:03 -0700 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-08-11 12:08:10 +0200 |
commit | 6289d5486d36d6294a16eaeae1d31045dda14eee (patch) | |
tree | 4655f3172dd3e145bf8e2c95e811ccf915291941 /lib | |
parent | 0ca5de8309f9942cf59190732a37fd251cc60ad1 (diff) | |
download | linux-6289d5486d36d6294a16eaeae1d31045dda14eee.tar.gz |
lib/bitmap: workaround const_eval test build failure
[ Upstream commit 2356d198d2b4ddec24efea98271cb3be230bc787 ] When building with Clang, and when KASAN and GCOV_PROFILE_ALL are both enabled, the test fails to build [1]: >> lib/test_bitmap.c:920:2: error: call to '__compiletime_assert_239' declared with 'error' attribute: BUILD_BUG_ON failed: !__builtin_constant_p(res) BUILD_BUG_ON(!__builtin_constant_p(res)); ^ include/linux/build_bug.h:50:2: note: expanded from macro 'BUILD_BUG_ON' BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) ^ include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG' #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) ^ include/linux/compiler_types.h:352:2: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^ include/linux/compiler_types.h:340:2: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^ include/linux/compiler_types.h:333:4: note: expanded from macro '__compiletime_assert' prefix ## suffix(); \ ^ <scratch space>:185:1: note: expanded from here __compiletime_assert_239 Originally it was attributed to s390, which now looks seemingly wrong. The issue is not related to bitmap code itself, but it breaks build for a given configuration. Disabling the const_eval test under that config may potentially hide other bugs. Instead, workaround it by disabling GCOV for the test_bitmap unless the compiler will get fixed. [1] https://github.com/ClangBuiltLinux/linux/issues/1874 Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202307171254.yFcH97ej-lkp@intel.com/ Fixes: dc34d5036692 ("lib: test_bitmap: add compile-time optimization/evaluations assertions") Co-developed-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Yury Norov <yury.norov@gmail.com> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'lib')
-rw-r--r-- | lib/Makefile | 6 | ||||
-rw-r--r-- | lib/test_bitmap.c | 8 |
2 files changed, 10 insertions, 4 deletions
diff --git a/lib/Makefile b/lib/Makefile index 59bd7c2f793a..5ffe72ec9979 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -81,8 +81,14 @@ obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_key_base.o obj-$(CONFIG_TEST_DYNAMIC_DEBUG) += test_dynamic_debug.o obj-$(CONFIG_TEST_PRINTF) += test_printf.o obj-$(CONFIG_TEST_SCANF) += test_scanf.o + obj-$(CONFIG_TEST_BITMAP) += test_bitmap.o obj-$(CONFIG_TEST_STRSCPY) += test_strscpy.o +ifeq ($(CONFIG_CC_IS_CLANG)$(CONFIG_KASAN),yy) +# FIXME: Clang breaks test_bitmap_const_eval when KASAN and GCOV are enabled +GCOV_PROFILE_test_bitmap.o := n +endif + obj-$(CONFIG_TEST_UUID) += test_uuid.o obj-$(CONFIG_TEST_XARRAY) += test_xarray.o obj-$(CONFIG_TEST_MAPLE_TREE) += test_maple_tree.o diff --git a/lib/test_bitmap.c b/lib/test_bitmap.c index a8005ad3bd58..37a9108c4f58 100644 --- a/lib/test_bitmap.c +++ b/lib/test_bitmap.c @@ -1149,6 +1149,10 @@ static void __init test_bitmap_print_buf(void) } } +/* + * FIXME: Clang breaks compile-time evaluations when KASAN and GCOV are enabled. + * To workaround it, GCOV is force-disabled in Makefile for this configuration. + */ static void __init test_bitmap_const_eval(void) { DECLARE_BITMAP(bitmap, BITS_PER_LONG); @@ -1174,11 +1178,7 @@ static void __init test_bitmap_const_eval(void) * the compiler is fixed. */ bitmap_clear(bitmap, 0, BITS_PER_LONG); -#if defined(__s390__) && defined(__clang__) - if (!const_test_bit(7, bitmap)) -#else if (!test_bit(7, bitmap)) -#endif bitmap_set(bitmap, 5, 2); /* Equals to `unsigned long bitopvar = BIT(20)` */ |