linux-kernel - Re: [PATCH RFC v3 0/8] kernel-hacking: introduce CONFIG_NO_AUTO

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Message-ID: <D9KW1QQR88EY.2TOSTVYZZH5KN@google.com>
Date: Thu, 01 May 2025 14:19:47 +0000
From: Brendan Jackman <jackmanb@...gle.com>
To: Christoph Hellwig <hch@....de>, <chenlinxuan@...ontech.com>
Cc: Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...nel.dk>, 
	Sagi Grimberg <sagi@...mberg.me>, Andrew Morton <akpm@...ux-foundation.org>, 
	Yishai Hadas <yishaih@...dia.com>, Jason Gunthorpe <jgg@...pe.ca>, 
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	Alex Williamson <alex.williamson@...hat.com>, Peter Huewe <peterhuewe@....de>, 
	Jarkko Sakkinen <jarkko@...nel.org>, Masahiro Yamada <masahiroy@...nel.org>, 
	Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas.schier@...ux.dev>, 
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	<xen-devel@...ts.xenproject.org>, Changbin Du <changbin.du@...el.com>, 
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH RFC v3 0/8] kernel-hacking: introduce CONFIG_NO_AUTO_INLINE

On Tue Apr 29, 2025 at 12:35 PM UTC, Christoph Hellwig wrote:
> On Tue, Apr 29, 2025 at 12:06:04PM +0800, Chen Linxuan via B4 Relay wrote:
>> This series introduces a new kernel configuration option NO_AUTO_INLINE,
>> which can be used to disable the automatic inlining of functions.
>> 
>> This will allow the function tracer to trace more functions
>> because it only traces functions that the compiler has not inlined.
>
> This still feels like a bad idea because it is extremely fragile.

Can you elaborate on that - does it introduce new fragility?