linux-kernel - Re: [RFC PATCH PoC 01/11] x86/linkage: Add SYM_PI_ALIAS() macro helper to emit symbol aliases

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Message-ID: <aAp9dMyCJ982GvKY@gmail.com>
Date: Thu, 24 Apr 2025 20:05:40 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Ard Biesheuvel <ardb+git@...gle.com>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org,
	Ard Biesheuvel <ardb@...nel.org>
Subject: Re: [RFC PATCH PoC 01/11] x86/linkage: Add SYM_PI_ALIAS() macro
 helper to emit symbol aliases


* Ard Biesheuvel <ardb+git@...gle.com> wrote:

> From: Ard Biesheuvel <ardb@...nel.org>
> 
> Startup code that may execute from the early 1:1 mapping of memory will
> be confined into its own address space, and only be permitted to access
> ordinary kernel symbols if this is known to be safe.
> 
> Introduce a macro helper PI_ALIAS() that emits a __pi_ prefixed alias
> for a symbol, which allows startup code to access it.

s/PI_ALIAS
 /SYM_PI_ALIAS

What does 'PI' stand for? 'Physical memory Identity' map?

Thanks,

	Ingo