Hello!
While trying to add Perf tests to LKFT [1], we encountered some problems building it for two specific combinations: * 4.4 and x86-64 * 4.14 and x86-32
On 4.4, this is what the build failure looks like: | bench/mem-memcpy-x86-64-asm.S:4:10: fatal error: ../../../arch/x86/lib/memcpy_64.S: No such file or directory | #include "../../../arch/x86/lib/memcpy_64.S" | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This was fixed in mainline by commit 7d7d1bf1d1da ("perf bench: Copy kernel files needed to build mem{cpy,set} x86_64 benchmarks"). Instead of just cherry-picking, it requires a proper backport as it needs to copy the existing files in 4.4, not the ones contained in that commit (which are from v4.7-rc5+).
On 4.14, this is what the build failure looks like: | In file included from util/libunwind/x86_32.c:33:0: | util/libunwind/../../arch/x86/util/unwind-libunwind.c: In function 'libunwind__x86_reg_id': | util/libunwind/../../arch/x86/util/unwind-libunwind.c:110:11: error: 'EINVAL' undeclared (first use in this function); did you mean 'UNW_EINVAL'? | return -EINVAL; | ^~~~~~ | UNW_EINVAL
This was fixed by 44df1afdb174 ("perf tools: Fix compile error with libunwind x86"); it applies cleanly on top of v4.14.106.
Thanks and greetings!
Daniel Díaz daniel.diaz@linaro.org