linux-kernel - Re: [PATCH] kselftest/arm64: Check that SVCR is 0 in signal handlers

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Message-ID: <ZzM8RrD248eSW5bG@arm.com>
Date: Tue, 12 Nov 2024 11:30:14 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: Mark Brown <broonie@...nel.org>
Cc: Will Deacon <will@...nel.org>, Shuah Khan <shuah@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kselftest/arm64: Check that SVCR is 0 in signal handlers

On Wed, Nov 06, 2024 at 05:07:51PM +0000, Mark Brown wrote:
> diff --git a/tools/testing/selftests/arm64/signal/testcases/ssve_regs.c b/tools/testing/selftests/arm64/signal/testcases/ssve_regs.c
> index 6dbe48cf8b09ed8b7a5ab47690bd87e39e18e1e6..3dee68fa36d1cf2716f54d5f328b3f4077493c3b 100644
> --- a/tools/testing/selftests/arm64/signal/testcases/ssve_regs.c
> +++ b/tools/testing/selftests/arm64/signal/testcases/ssve_regs.c
> @@ -85,6 +85,11 @@ static int do_one_sme_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,
>  	fprintf(stderr, "Got expected size %u and VL %d\n",
>  		head->size, ssve->vl);
>  
> +	if (get_svcr() != 0) {
> +		fprintf(stderr, "Unexpected SVCR %llx\n", get_svcr());
> +		return 1;
> +	}
> +
>  	return 0;
>  }
>  
> diff --git a/tools/testing/selftests/arm64/signal/testcases/za_regs.c b/tools/testing/selftests/arm64/signal/testcases/za_regs.c
> index b9e13f27f1f9aaf55db2a5e391f360993561d0b7..9fff4c50030414d06157e0da0c29fd794f707309 100644
> --- a/tools/testing/selftests/arm64/signal/testcases/za_regs.c
> +++ b/tools/testing/selftests/arm64/signal/testcases/za_regs.c
> @@ -91,6 +91,11 @@ static int do_one_sme_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,
>  		return 1;
>  	}
>  
> +	if (get_svcr() != 0) {
> +		fprintf(stderr, "Unexpected SVCR %llx\n", get_svcr());
> +		return 1;
> +	}

I think I'll change both printf specifiers to %lx here since in the libc
I have installed, uin64_t is an unsigned long (the kernel defines it as
unsigned long long). Both gcc and clang complain but the compiler
shouldn't matter since the headers come with glibc.

-- 
Catalin