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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
	Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Ingo Molnar <mingo@redhat.com>, Jonathan Corbet <corbet@lwn.net>,
	Thomas Gleixner <tglx@kernel.org>
Subject: Re: [PATCH] x86: Start removing X86_X32_ABI
Message-ID: <20260526104051.MmQQ03a8@linutronix.de>
References: <20260523093734.A3AR7reJ@linutronix.de>
 <10BF3F18-4709-43D6-979C-49067707F1C1@zytor.com>
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In-Reply-To: <10BF3F18-4709-43D6-979C-49067707F1C1@zytor.com>

On 2026-05-23 14:43:52 [-0700], H. Peter Anvin wrote:
> However, we can not recycle the syscall numbers. The x32 flag in the
> syscall number was advisory originally; it was introduced late in the
> game to work around a design bug in the input subsystem (*).

If x32 is removed/ not supported why can't the 32/64 bit ABI use syscall
numbers 512+? It is an ELF32 with EM_X86_64 which should be rejected.
Shouldn't this free the space because there are no users anymore?

>    -hpa

Sebastian