Re: selftests broke upstream

From: Shuah Khan
Date: Wed Mar 01 2017 - 18:00:28 EST


On 03/01/2017 07:29 AM, Shuah Khan wrote:
> On 03/01/2017 02:24 AM, Ingo Molnar wrote:
>>
>> Hi,
>>
>> The x86 selftests build broke upstream:
>>
>> triton:~/tip/tools/testing/selftests/x86> make
>> Makefile:44: warning: overriding recipe for target 'clean'
>
> This is odd. It should work. Are there any changes that came in through
> x86 tree?
>
>> ../lib.mk:51: warning: ignoring old recipe for target 'clean'
>> gcc -m32 -o /single_step_syscall_32 -O2 -g -std=gnu99 -pthread -Wall
>> single_step_syscall.c -lrt -ldl -lm
>> /usr/bin/ld: cannot open output file /single_step_syscall_32: Permission denied
>> collect2: error: ld returned 1 exit status
>> Makefile:47: recipe for target '/single_step_syscall_32' failed
>> make: *** [/single_step_syscall_32] Error 1
>>
>> It used to be possible to build only the x86 testcases in that directory.
>>
>> Another problem is that the pkeys testcases are still very noisy:
>>
>> gcc -m64 -o /home/mingo/tip/tools/testing/selftests/x86/protection_keys_64 -O2 -g -std=gnu99 -pthread -Wall protection_keys.c -lrt -ldl
>> In file included from protection_keys.c:45:0:
>> pkey-helpers.h: In function âsigsafe_printfâ:
>> pkey-helpers.h:41:3: warning: ignoring return value of âwriteâ, declared with attribute warn_unused_result [-Wunused-result]
>> write(1, dprint_in_signal_buffer, len);
>> ^
>> protection_keys.c: In function âdumpitâ:
>> protection_keys.c:407:3: warning: ignoring return value of âwriteâ, declared with attribute warn_unused_result [-Wunused-result]
>> write(1, buf, nr_read);
>> ^
>> gcc -m64 -o /home/mingo/tip/tools/testing/selftests/x86/test_vdso_64 -O2 -g -std=gnu99 -pthread -Wall test_vdso.c -lrt -ldl
>> test_vdso.c: In function âmainâ:
>> test_vdso.c:98:37: warning: ânodeâ may be used uninitialized in this function [-Wmaybe-uninitialized]
>> if (!ret_vsys && (cpu_vsys != cpu || node_vsys != node))
>> ^
>> test_vdso.c:78:12: note: ânodeâ was declared here
>> unsigned node;
>> ^
>>
>> I thought all this got already fixed?
>
> Hmm. I included all the patches Dave Hansen sent me in my pull request.
> I also added couple of cleanup patches I did for pkeys.
>
> I will take a look and see what's going on and let you know. I usually
> wait until rc1 comes out for the dust to settle before I go in run sanity
> checks on selftests. But I will do some test runs today and let you know
> what I find.
>
> Thanks for letting me know.
>
> -- Shuah
>

Sent in the fix. You are cc'ed on it. Thanks again for reporting it. It ended
to be an easy fix.

thanks,
-- Shuah