linux-kernel - Re: [PATCH] arm64: Kconfig: allow to change FORCE_MAX

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Date:   Mon, 16 Mar 2020 17:42:00 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Vadym Kochan <vadym.kochan@...ision.eu>
Cc:     Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: Kconfig: allow to change FORCE_MAX_ZONEORDER via
 custom config

On Fri, Mar 13, 2020 at 02:45:58PM +0200, Vadym Kochan wrote:
> On Fri, Mar 13, 2020 at 12:37:41PM +0000, Catalin Marinas wrote:
> > On Fri, Mar 13, 2020 at 01:50:37AM +0200, Vadym Kochan wrote:
> > > Add missing config option name which allows to change it via custom
> > > config.
> > 
> > Why? What is your use-case?
> 
> I need to allocate buffers bigger than default ZONEORDER, so I tried to
> increase it but it did not work because the config entry has no name.

I try not to make this selectable as we want a single kernel build to
work on all supported hardware. The current values are chosen to allow
huge pages. If you need bigger contiguous allocations, maybe something
like CMA would help.

-- 
Catalin