linux-kernel - Re: [PATCH] x86/sgx: Use ENCLS mnemonic in <kernel/cpu/sgx/encls.h>

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Message-ID: <26b8939e-796a-4581-a41c-42e3582326bd@intel.com>
Date: Tue, 17 Jun 2025 08:01:28 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Jarkko Sakkinen <jarkko@...nel.org>, Uros Bizjak <ubizjak@...il.com>
Cc: linux-sgx@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>,
 Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86/sgx: Use ENCLS mnemonic in <kernel/cpu/sgx/encls.h>

On 6/17/25 07:44, Jarkko Sakkinen wrote:
> I don't really see how this is that useful. That said, f a bug fix or
> feature used encls mnemonic, I'd had no problems with acking it.

It's not _that_ useful.

But old assemblers that we still want to use *NEVER* have support for
newfanlged instructions, so we always add new instructions with ".byte".
Then, a few years down the road when we've moved to just old assemblers
instead of super old assemblers, we move to the real instruction names.

This is all business as usual.