On 08/16/2017 12:05 AM, Thomas Richter wrote:
> On s390x the compilation of the file sas.c in directory
> tools/testing/selftests/sigaltstack fails with this error message:
>
> [root@s8360046 sigaltstack]# make
> gcc -Wall sas.c -o /root/linux/tools/testing/selftests/sigaltstack/sas
> sas.c: In function ‘my_usr1’:
> sas.c:40:25: error: invalid register name for ‘sp’
> register unsigned long sp asm("sp");
> ^~
> ../lib.mk:62: recipe for target '/root/linux/tools/testing/selftests/sigaltstack/sas' failed
> make: *** [/root/linux/tools/testing/selftests/sigaltstack/sas] Error 1
> [root@s8360046 sigaltstack]#
>
> On s390x the stack pointer is register r15, the register name "sp"
> is unknown.
> Make this line platform dependend and use register r15.
>
> Which this patch the compilation and test succeeds:
>
> [root@s8360046 sigaltstack]# make
> gcc -Wall sas.c -o /root/linux/tools/testing/selftests/sigaltstack/sas
> [root@s8360046 sigaltstack]# ./sas
> [OK] Initial sigaltstack state was SS_DISABLE
> [RUN] signal USR1
> [OK] sigaltstack is disabled in sighandler
> [RUN] switched to user ctx
> [RUN] signal USR2
> [OK] Stack preserved
> [OK] sigaltstack is still SS_AUTODISARM after signal
> [OK] Test passed
> [root@s8360046 sigaltstack]#
>
> Signed-off-by: Thomas Richter <tmricht@xxxxxxxxxxxxxxxxxx>
Applied to linux-kselftest fixes for 4.14-rc2
thanks,
-- Shuah
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