linux-kernel - Re: [PATCH v4 2/2] bug: introduce ASSERT_VAR_CAN

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Date: Tue, 26 Mar 2024 12:55:12 +0100
From: Petr Tesařík <petr@...arici.cz>
To: Christoph Hellwig <hch@....de>
Cc: Petr Tesarik <petrtesarik@...weicloud.com>, Marek Szyprowski
 <m.szyprowski@...sung.com>, Robin Murphy <robin.murphy@....com>, Petr
 Tesarik <petr.tesarik1@...wei-partners.com>, Michael Kelley
 <mhklinux@...look.com>, Will Deacon <will@...nel.org>, open list
 <linux-kernel@...r.kernel.org>, "open list:DMA MAPPING HELPERS"
 <iommu@...ts.linux.dev>, Roberto Sassu <roberto.sassu@...weicloud.com>
Subject: Re: [PATCH v4 2/2] bug: introduce ASSERT_VAR_CAN_HOLD()

On Tue, 26 Mar 2024 08:56:06 +0100
Christoph Hellwig <hch@....de> wrote:

> On Mon, Mar 25, 2024 at 09:31:05AM +0100, Petr Tesarik wrote:
> > From: Petr Tesarik <petr.tesarik1@...wei-partners.com>
> > 
> > Introduce an ASSERT_VAR_CAN_HOLD() macro to check at build time that a
> > variable can hold the given value.  
> 
> This really should be run past whoever maintains build_bug.h and
> also cc linux-kernel.  Please also split the addition and the user
> in swiotlb into separate patches.
> 
> I plan to pick up patch 1 for now, and wait for the discussion on
> this addition.

Fair enough. The use in swiotlb depends on patch 1 from this series,
but you're right, I can send the macro addition as a separate patch to
get some feedback.

Thank you!
Petr T