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@xxxxxxxxxx
[1] https://lkft.linaro.org/about/
