lib: test get_count_order/long in test_bitops.c

2020-06-11T02:14:18Z

Add some tests for get_count_order/long in test_bitops.c. [akpm@linux-foundation.org: define local `i'] [akpm@linux-foundation.org: enhancement, warning fix, cleanup per Geert] [akpm@linux-foundation.org: fix loop bound, per Wei Yang] Signed-off-by: Wei Yang Signed-off-by: Andrew Morton Reviewed-by: Andy Shevchenko Cc: Christian Brauner Cc: Geert Uytterhoeven Link: http://lkml.kernel.org/r/20200602223728.32722-1-richard.weiyang@gmail.com Signed-off-by: Linus Torvalds

lib: make a test module with set/clear bit

2020-06-05T02:06:25Z

Test some bit clears/sets to make sure assembly doesn't change, and that the set_bit and clear_bit functions work and don't cause sparse warnings. Instruct Kbuild to build this file with extra warning level -Wextra, to catch new issues, and also doesn't hurt to build with C=1. This was used to test changes to arch/x86/include/asm/bitops.h. In particular, sparse (C=1) was very concerned when the last bit before a natural boundary, like 7, or 31, was being tested, as this causes sign extension (0xffffff7f) for instance when clearing bit 7. Recommended usage: make defconfig scripts/config -m CONFIG_TEST_BITOPS make modules_prepare make C=1 W=1 lib/test_bitops.ko objdump -S -d lib/test_bitops.ko insmod lib/test_bitops.ko rmmod lib/test_bitops.ko , there should be no compiler/sparse warnings and no error messages in log. Link: http://lkml.kernel.org/r/20200310221747.2848474-2-jesse.brandeburg@intel.com Signed-off-by: Jesse Brandeburg Reviewed-by: Andy Shevchenko Cc: Thomas Gleixner CcL Ingo Molnar Signed-off-by: Andrew Morton Cc: Borislav Petkov Cc: Rasmus Villemoes Cc: Dan Williams Cc: Peter Zijlstra Cc: Wei Yang Cc: Christian Brauner Signed-off-by: Linus Torvalds

linux/lib/test_bitops.c, branch v5.8

lib: test get_count_order/long in test_bitops.c

lib: make a test module with set/clear bit