linux-kernel - Re: [PATCH 1/3] crypto: X25519 low-level primitives for ppc64le.

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Message-ID: <dc5aadc2-308d-4f24-8a59-45da21b8b2e5@cryptogams.org>
Date: Wed, 15 May 2024 10:11:26 +0200
From: Andy Polyakov <appro@...ptogams.org>
To: Danny Tsen <dtsen@...ux.ibm.com>, linux-crypto@...r.kernel.org
Cc: herbert@...dor.apana.org.au, leitao@...ian.org, nayna@...ux.ibm.com,
 linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
 mpe@...erman.id.au, ltcgcw@...ux.vnet.ibm.com, dtsen@...ibm.com
Subject: Re: [PATCH 1/3] crypto: X25519 low-level primitives for ppc64le.

Hi,

Couple of remarks inline.

> +# [1] https://www.openssl.org/~appro/cryptogams/

https://github.com/dot-asm/cryptogams/ is arguably better reference.

> +SYM_FUNC_START(x25519_fe51_mul)
> +.align	5

The goal is to align the label, not the first instruction after the 
directive. It's not a problem in this spot, in the beginning of the 
module that is, but further below it's likely to inject redundant nops 
between the label and meaningful code. But since the directive in 
question is not position-sensitive one can resolve this by changing the 
order of the directive and the SYM_FUNC_START macro.

Cheers.