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Subject: Re: [PATCH v3 1/4] selftests/arm64: Print missing MTE TAP headers
To: Muhammad Usama Anjum <usama.anjum@arm.com>,
 Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>,
 Mark Rutland <mark.rutland@arm.com>, Shuah Khan <shuah@kernel.org>,
 Andrey Konovalov <andreyknvl@gmail.com>,
 Andrew Morton <akpm@linux-foundation.org>,
 Amit Daniel Kachhap <amit.kachhap@arm.com>, Yeoreum Yun
 <yeoreum.yun@arm.com>, Mark Brown <broonie@kernel.org>,
 open list <linux-kernel@vger.kernel.org>,
 "moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)"
 <linux-arm-kernel@lists.infradead.org>,
 "open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@vger.kernel.org>
References: <20260825111929.2882324-1-usama.anjum@arm.com>
 <20260825111929.2882324-2-usama.anjum@arm.com>
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From: Vincenzo Frascino <vincenzo.frascino@arm.com>
In-Reply-To: <20260825111929.2882324-2-usama.anjum@arm.com>
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On 25/08/2026 12:18, Muhammad Usama Anjum wrote:
> Most MTE tests set a TAP plan and emit results without first printing
> the TAP version header. Direct execution therefore starts with a plan
> such as "1..20" instead of "TAP version 13".
> 
> The problem is particularly visible in the GCR_EL1 context-switch test.
> It prints its plan before forking 1,024 child processes. When stdout is
> fully buffered, the plan remains in the stdio buffer. Each child inherits
> the pending "1..1" line and flushes its copy from exit(), producing
> repeated plan lines.
> 
> ksft_print_header() prints the TAP header and enables line buffering.
> Call it in every MTE test that is missing it. In the GCR_EL1 test, call
> it before the plan so the plan is flushed before the children are
> forked. In the remaining tests, call it before setup and prerequisite
> checks so early failures and whole-test skips also retain the header.
> 
> Fixes: 29f080881601 ("kselftest/arm64: check GCR_EL1 after context switch")
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@arm.com>

Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>

...