From: Mike Rapoport <rppt@kernel.org>
To: Arnd Bergmann <arnd@kernel.org>
Cc: Stefan Agner <stefan@agner.ch>, Minchan Kim <minchan@kernel.org>,
ngupta@vflare.org,
Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
sjenning@linux.vnet.ibm.com, gregkh <gregkh@linuxfoundation.org>,
Arnd Bergmann <arnd@arndb.de>, Linux-MM <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm/zsmalloc: include sparsemem.h for MAX_PHYSMEM_BITS
Date: Wed, 11 Nov 2020 12:26:54 +0200 [thread overview]
Message-ID: <20201111102654.GF4758@kernel.org> (raw)
In-Reply-To: <CAK8P3a2vKOb_R3_tqO_XVCCn5Si2jFA5DRe_spB2-+gsoDhO6g@mail.gmail.com>
On Wed, Nov 11, 2020 at 10:33:29AM +0100, Arnd Bergmann wrote:
> On Tue, Nov 10, 2020 at 5:21 PM Mike Rapoport <rppt@kernel.org> wrote:
> > On Tue, Nov 10, 2020 at 12:21:11PM +0100, Arnd Bergmann wrote:
> > >
> > > To be on the safe side, we could provoke a compile-time error
> > > when CONFIG_PHYS_ADDR_T_64BIT is set on a 32-bit
> > > architecture, but MAX_POSSIBLE_PHYSMEM_BITS is not set.
> >
> > Maybe compile time warning and a runtime error in zs_init() if 32 bit
> > machine has memory above 4G?
>
> If the fix is as easy as adding a single line in a header, I think a
> compile-time
> error makes it easier, no need to wait for someone to boot a broken
> system before fixing it.
Not sure it would be as easy as adding a single line in a header for
MIPS with it's diversity.
How about adding a runtime detection like Minchan suggested for
!MEMORY_HOTPLUG (e.g. MIPS and ARC) and a compile time error otherwise
(i386, ppc)?
> Arnd
--
Sincerely yours,
Mike.
next prev parent reply other threads:[~2020-11-11 10:27 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-07 15:22 [PATCH] mm/zsmalloc: include sparsemem.h for MAX_PHYSMEM_BITS Stefan Agner
2020-11-08 0:56 ` Andrew Morton
2020-11-08 1:16 ` Stefan Agner
2020-11-08 4:54 ` Florian Fainelli
2020-11-09 17:04 ` Minchan Kim
2020-11-08 6:46 ` Mike Rapoport
2020-11-10 9:29 ` Stefan Agner
2020-11-10 9:58 ` Mike Rapoport
2020-11-10 11:21 ` Arnd Bergmann
2020-11-10 12:22 ` Stefan Agner
2020-11-10 15:19 ` Arnd Bergmann
2020-11-10 16:21 ` Mike Rapoport
2020-11-10 23:36 ` Minchan Kim
2020-11-11 6:52 ` Mike Rapoport
2020-11-12 19:49 ` Minchan Kim
2020-11-11 9:33 ` Arnd Bergmann
2020-11-11 10:26 ` Mike Rapoport [this message]
2020-11-11 10:57 ` Arnd Bergmann
2020-11-11 11:04 ` Mike Rapoport
2020-11-11 13:39 ` Thomas Bogendoerfer
2020-11-11 14:33 ` Arnd Bergmann
2020-11-12 19:50 ` Minchan Kim
2020-11-12 23:46 ` Florian Fainelli
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