linux-kernel - Re: [tip: x86/asm] x86/asm: Make ASM_CALL_CONSTRAINT conditional on frame pointers

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Message-ID: <c7496069-2630-45ca-b6d3-c8d6b3678271@citrix.com>
Date: Tue, 4 Mar 2025 00:57:49 +0000
From: Andrew Cooper <andrew.cooper3@...rix.com>
To: hpa@...or.com
Cc: brgerst@...il.com, jpoimboe@...nel.org, linux-kernel@...r.kernel.org,
 linux-tip-commits@...r.kernel.org, mingo@...nel.org, peterz@...radead.org,
 tip-bot2@...utronix.de, torvalds@...ux-foundation.org, x86@...nel.org
Subject: Re: [tip: x86/asm] x86/asm: Make ASM_CALL_CONSTRAINT conditional on
 frame pointers

> One more thing: if we remove ASM_CALL_CONSTRAINTS, we will not be able to use the redzone in future FRED only kernel builds.

That's easy enough to fix with "|| CONFIG_FRED_EXCLUSIVE" in some
theoretical future when it's a feasible config to use.

~Andrew