linux-kernel - Re: [PATCH libcrypto v2 2/3] compiler: introduce at_least parameter decoration pseudo keyword

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Message-ID: <aSEpNYgrYRGOihxy@gondor.apana.org.au>
Date: Sat, 22 Nov 2025 11:08:37 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: "Jason A. Donenfeld" <Jason@...c4.com>
Cc: torvalds@...ux-foundation.org, ebiggers@...nel.org, ardb@...nel.org,
	kees@...nel.org, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH libcrypto v2 2/3] compiler: introduce at_least parameter
 decoration pseudo keyword

On Sat, Nov 22, 2025 at 03:46:38AM +0100, Jason A. Donenfeld wrote:
>
> Saw your reply to v1 and was thinking about that. Will do. Thanks for
> pointing this out.

It seems that we need to bring the brackets back, because sparse
won't take this either:

int foo(int n, int a[n])
{
	return a[0]++;
}

But this seems to work:

#ifdef __CHECKER__
#define at_least(x)
#else
#define at_least(x) static x
#endif

int foo(int n, int a[at_least(n)])
{
	return a[0]++;
}

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt