linux-kernel - Re: [PATCH] selftests: proc: Fix proc-empty-vm build error on non x86

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Message-ID: <Y2vcc00tszEg7Ljz@p183>
Date:   Wed, 9 Nov 2022 19:59:31 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Punit Agrawal <punit.agrawal@...edance.com>
Cc:     akpm@...ux-foundation.org, shuah@...nel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH] selftests: proc: Fix proc-empty-vm build error on non
 x86_64

On Wed, Nov 09, 2022 at 11:06:21AM +0000, Punit Agrawal wrote:
> The proc-empty-vm test is implemented for x86_64 and fails to build
> for other architectures. Rather then emitting a compiler error it
> would be preferable to only build the test on supported architectures.

Ehh, can you just port it to whatever arch you're using?
What's the address space on arm/arm64?

	#ifdef __amd64__
                munmap(NULL, ((size_t)1 << 47) - 4096);
	#else
	#error "implement 'unmap everything'"
	#endif

This program is almost arch-independent.

> +TEST_GEN_PROGS_x86_64 += proc-empty-vm