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The Linux kernel configuration item CONFIG_TEST_FPU
:
CONFIG_ARCH_HAS_KERNEL_FPU_SUPPORT && ! CONFIG_KCOV_INSTRUMENT_ALL
test_fpu
Enable this option to add /sys/kernel/debug/selftest_helpers/test_fpu which will trigger a sequence of floating point operations. This is used for self-testing floating point control register setting in kernel_fpu_begin().
If unsure, say N.
Raw data from LKDDb:
lkddb module test_fpu CONFIG_TEST_FPU : lib/Kconfig.debug : "Test floating point operations in kernel space" # in 5.9–5.19, 6.0–6.11, 6.12-rc+HEAD
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Automatically generated (in year 2024). See also LKDDb sources on GitLab