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Date: Wed, 17 Jun 2026 12:11:49 +0100
From: Leo Yan <leo.yan@arm.com>
To: James Clark <james.clark@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org,
	linux-perf-users@vger.kernel.org,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	John Garry <john.g.garry@oracle.com>, Will Deacon <will@kernel.org>,
	Mike Leach <mike.leach@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@kernel.org>, Ian Rogers <irogers@google.com>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Al Grant <al.grant@arm.com>,
	Paschalis Mpeis <paschalis.mpeis@arm.com>,
	Amir Ayupov <aaupov@fb.com>
Subject: Re: [PATCH v9 9/9] perf test: Add Arm CoreSight callchain test
Message-ID: <20260617111149.GC31870@e132581.arm.com>
References: <20260616-b4-arm_cs_callchain_support_v1-v9-0-f8fad931c413@arm.com>
 <20260616-b4-arm_cs_callchain_support_v1-v9-9-f8fad931c413@arm.com>
 <00183ce3-e387-4ca3-9eb8-67aa6a1221e5@linaro.org>
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In-Reply-To: <00183ce3-e387-4ca3-9eb8-67aa6a1221e5@linaro.org>

On Wed, Jun 17, 2026 at 09:38:42AM +0100, James Clark wrote:

[...]

> > +noinline void callchain_do_syscall(void)
> > +{
> > +	syscall(SYS_getpid);
> 
> I get this error when compiling for x86, but it works on Arm:
> 
> tests/workloads/callchain.c:17:10: error: use of undeclared identifier
> 'SYS_getpid'; did you mean '__getpgid'?
>         syscall(SYS_getpid);
>                 ^~~~~~~~~~
>                 __getpgid
> /usr/include/unistd.h:659:16: note: '__getpgid' declared here
> extern __pid_t __getpgid (__pid_t __pid) __THROW;

Thanks for finding this.

This is not the issue for program itself actually, it contains
tools/arch/x86/include/uapi/asm/unistd_64.h rather than uAPI headers
provided in toolchain or kernel.

At current stage, we can simply change to syscall(SYS_gettid) to
workaround the issue.