linux-kernel - Re: [PATCH] mm: fix KASAN build error due to p*d_populate

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Message-ID: <331840cc-c045-4652-b1e9-24253bb994a5@lucifer.local>
Date: Thu, 21 Aug 2025 12:46:14 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Harry Yoo <harry.yoo@...cle.com>
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Subject: Re: [PATCH] mm: fix KASAN build error due to p*d_populate_kernel()

On Thu, Aug 21, 2025 at 07:42:06PM +0900, Harry Yoo wrote:
> > > Signed-off-by: Harry Yoo <harry.yoo@...cle.com>
> >
> > This looks good, other than the nit below re: a comment, I think when we
> > are doing this kind of thing it's necessary to spell out plainly why
> > exactly we're doing it because it's not obvious at first glance.
>
> Good point, will do:
>
> /*
>  * {pgd,p4d}_populate_kernel() are defined as macros to allow
>  * compile-time optimization based on the configured page table levels.
>  * Without this, linking may fail because callers (e.g., KASAN) may rely
>  * on calls to these functions being optimized away when passing symbols
>  * that exist only for certain page table levels.
>  */

Thanks LGTM!