Subject: Re: [PATCH 5/5] selftests/powerpc: Add test for pkey siginfo verification

From: Michael Ellerman <[email-masked]>
Date: Mon, 27 Jul 2020 00:05:47 +1000

Sandipan Das <[email-masked]> writes:
> diff --git a/tools/testing/selftests/powerpc/mm/pkey_siginfo.c b/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 = gettid();

pkey_siginfo.c: In function 'protect':
pkey_siginfo.c:103:8: error: implicit declaration of function 'gettid' [-Werror=implicit-function-declaration]
  tid = gettid();
        ^

On Ubuntu 18.04 at least.

cheers