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Date: Sun, 26 Jul 2020 16:40:09 +0200
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From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: [PATCH 5/5] selftests/powerpc: Add test for pkey siginfo
 verification
References: <cover.1594897099.git.sandipan@linux.ibm.com>
 <af137a935684955a60f13de2eb4ca358284f3d7c.1594897099.git.sandipan@linux.ibm.com>
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Cc: fweimer@redhat.com, aneesh.kumar@linux.ibm.com, linuxram@us.ibm.com,
 Sandipan Das <sandipan@linux.ibm.com>, linuxppc-dev@lists.ozlabs.org,
 bauerman@linux.ibm.com
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Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

Michael Ellerman <mpe@ellerman.id.au> a =C3=A9crit=C2=A0:

> Sandipan Das <sandipan@linux.ibm.com> writes:
>> diff --git a/tools/testing/selftests/powerpc/mm/pkey_siginfo.c=20=20
>>=20b/tools/testing/selftests/powerpc/mm/pkey_siginfo.c
>> new file mode 100644
>> index 0000000000000..58605c53d495d
>> --- /dev/null
>> +++ b/tools/testing/selftests/powerpc/mm/pkey_siginfo.c
>> @@ -0,0 +1,332 @@
> ...
>> +
>> +static void *protect(void *p)
>> +{
>> +	unsigned long rights;
>> +	unsigned int *base;
>> +	size_t size;
>> +	int tid, i;
>> +
>> +	tid =3D gettid();
>
> pkey_siginfo.c: In function 'protect':
> pkey_siginfo.c:103:8: error: implicit declaration of function=20=20
>=20'gettid' [-Werror=3Dimplicit-function-declaration]
>   tid =3D gettid();
>         ^
>
>
> On Ubuntu 18.04 at least.

See https://man7.org/linux/man-pages/man2/gettid.2.html

Added in glibc 2.30

Christophe