linux-kernel - Re: [PATCH v2 4/4] mm, arch: add generic implementation of pfn

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Date:   Sun, 12 Feb 2023 09:38:36 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>, Brian Cain <bcain@...cinc.com>,
        "David S. Miller" <davem@...emloft.net>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Guo Ren <guoren@...nel.org>, Helge Deller <deller@....de>,
        Huacai Chen <chenhuacai@...nel.org>,
        Matt Turner <mattst88@...il.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Simek <monstr@...str.eu>,
        Palmer Dabbelt <palmer@...belt.com>,
        Rich Felker <dalias@...c.org>,
        Richard Weinberger <richard@....at>,
        Russell King <linux@...linux.org.uk>,
        Stafford Horne <shorne@...il.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Vineet Gupta <vgupta@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        linux-alpha@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-mips@...r.kernel.org, linux-mm@...ck.org,
        linux-parisc@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-sh@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linux-um@...ts.infradead.org, linux-xtensa@...ux-xtensa.org,
        linuxppc-dev@...ts.ozlabs.org, loongarch@...ts.linux.dev,
        openrisc@...ts.librecores.org, sparclinux@...r.kernel.org,
        x86@...nel.org, Huacai Chen <chenhuacai@...ngson.cn>
Subject: Re: [PATCH v2 4/4] mm, arch: add generic implementation of
 pfn_valid() for FLATMEM

On 2/12/23 08:26, Mike Rapoport wrote:
> Hi Guenter,
> 
> On Sun, Feb 12, 2023 at 08:13:20AM -0800, Guenter Roeck wrote:
>> On Sun, Jan 29, 2023 at 02:42:35PM +0200, Mike Rapoport wrote:
>>> From: "Mike Rapoport (IBM)" <rppt@...nel.org>
>>>
>>> Every architecture that supports FLATMEM memory model defines its own
>>> version of pfn_valid() that essentially compares a pfn to max_mapnr.
>>>
>>> Use mips/powerpc version implemented as static inline as a generic
>>> implementation of pfn_valid() and drop its per-architecture definitions.
>>>
>>
>> With this patch in the tree, sh4 and sh4eb qemu emulations no longer boot.
>> Reverting this patch fixes the problem.
>   
> Can you please test with only partial revert for arch/sh?
> 

Sure, that works as well.

Guenter