linux-kernel - Re: [RFC PATCH 3/3] mm: Implement for_each_valid_pfn() for CONFIG

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Message-ID: <0d89238f3ad9444abfc905a79ff14388a61cf00d.camel@infradead.org>
Date: Thu, 03 Apr 2025 15:17:44 +0100
From: David Woodhouse <dwmw2@...radead.org>
To: Mike Rapoport <rppt@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, "Sauerwein, David"
 <dssauerw@...zon.de>, Anshuman Khandual <anshuman.khandual@....com>, Ard
 Biesheuvel <ardb@...nel.org>, Catalin Marinas <catalin.marinas@....com>,
 David Hildenbrand <david@...hat.com>, Marc Zyngier <maz@...nel.org>, Mark
 Rutland <mark.rutland@....com>, Mike Rapoport <rppt@...ux.ibm.com>, Will
 Deacon <will@...nel.org>, kvmarm@...ts.cs.columbia.edu, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-mm@...ck.org
Subject: Re: [RFC PATCH 3/3] mm: Implement for_each_valid_pfn() for
 CONFIG_SPARSEMEM

On Thu, 2025-04-03 at 17:13 +0300, Mike Rapoport wrote:
>  
> > static inline bool first_valid_pfn(unsigned long *p_pfn)
> > {
> >  	unsigned long pfn = *p_pfn;
> >  	unsigned long nr = pfn_to_section_nr(pfn);
> >  	struct mem_section *ms;
> > 
> >  	rcu_read_lock_sched();
> > 
> >  	while (nr <= __highest_present_section_nr) {
> >  		ms = __pfn_to_section(pfn);
> 
> Maybe move the declaration here:
> 
>  	struct mem_section *ms = __pfn_to_section(pfn);

Ack.

https://git.infradead.org/users/dwmw2/linux.git/shortlog/refs/heads/for_each_valid_pfn



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