linux-kernel - Re: [PATCH 1/4] arch: consolidate existing CONFIG_PAGE_SIZE

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Message-Id: <1b857914-bc1d-4b9a-b3f1-4eabd8db9810@app.fastmail.com>
Date: Tue, 27 Feb 2024 16:48:29 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Christophe Leroy" <christophe.leroy@...roup.eu>,
 "Samuel Holland" <samuel.holland@...ive.com>,
 "Arnd Bergmann" <arnd@...nel.org>, "Thomas Gleixner" <tglx@...utronix.de>,
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Subject: Re: [PATCH 1/4] arch: consolidate existing CONFIG_PAGE_SIZE_*KB definitions

On Tue, Feb 27, 2024, at 16:44, Christophe Leroy wrote:
> Le 27/02/2024 à 16:40, Arnd Bergmann a écrit :
>> On Mon, Feb 26, 2024, at 17:55, Samuel Holland wrote:
>
>
> For 256K pages, powerpc has the following help. I think you should have 
> it too:
>
> 	  The kernel will only be able to run applications that have been
> 	  compiled with '-zmax-page-size' set to 256K (the default is 64K) using
> 	  binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
> 	  definition from 0x10000 to 0x40000 in older versions.

I don't think we need to mention pre-2.18 binutils any more, but the
rest seems useful, changed the text now to

config PAGE_SIZE_256KB
        bool "256KiB pages"
        depends on HAVE_PAGE_SIZE_256KB
        help
          256KiB pages have little practical value due to their extreme
          memory usage.  The kernel will only be able to run applications
          that have been compiled with '-zmax-page-size' set to 256KiB
          (the default is 64KiB or 4KiB on most architectures).

      Arnd