linux-kernel - Re: [PATCH] x86/xen: Make virt_to

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Date:   Fri, 11 Aug 2023 16:48:45 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/xen: Make virt_to_pfn() a static inline

On 10.08.23 09:27, Linus Walleij wrote:
> Making virt_to_pfn() a static inline taking a strongly typed
> (const void *) makes the contract of a passing a pointer of that
> type to the function explicit and exposes any misuse of the
> macro virt_to_pfn() acting polymorphic and accepting many types
> such as (void *), (unitptr_t) or (unsigned long) as arguments
> without warnings.
> 
> Also fix all offending call sites to pass a (void *) rather
> than an unsigned long. Since virt_to_mfn() is wrapping
> virt_to_pfn() this function has become polymorphic as well
> so the usage need to be fixed up.
> 
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>

Acked-by: Juergen Gross <jgross@...e.com>


Juergen


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