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Message-ID: <20170317073437.GA14797@gmail.com>
Date: Fri, 17 Mar 2017 08:34:37 +0100
From: Ingo Molnar <mingo@...nel.org>
To: Thomas Garnier <thgarnie@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
"H . Peter Anvin" <hpa@...or.com>, Jonathan Corbet <corbet@....net>,
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Subject: Re: [PATCH v7 1/3] x86/mm: Adapt MODULES_END based on Fixmap section
size
* Thomas Garnier <thgarnie@...gle.com> wrote:
> On Thu, Mar 16, 2017 at 1:10 AM, Ingo Molnar <mingo@...nel.org> wrote:
> >
> > Note that asm/fixmap.h is an x86-ism that isn't present in many other
> > architectures, so this hunk will break the build.
> >
> > To make progress with these patches I've fixed it up with an ugly #ifdef
> > CONFIG_X86, but it needs a real solution instead before this can be pushed
> > upstream.
>
> I also saw an error on x86 tip on special configuration. I found this
> new patch below to be a good solution to both.
>
> Let me know what you think.
>
> =====
>
> This patch aligns MODULES_END to the beginning of the Fixmap section.
> It optimizes the space available for both sections. The address is
> pre-computed based on the number of pages required by the Fixmap
> section.
>
> It will allow GDT remapping in the Fixmap section. The current
> MODULES_END static address does not provide enough space for the kernel
> to support a large number of processors.
>
> Signed-off-by: Thomas Garnier <thgarnie@...gle.com>
> ---
> Based on next-20170308
> ---
> Documentation/x86/x86_64/mm.txt | 5 ++++-
> arch/x86/include/asm/pgtable_64.h | 1 +
> arch/x86/include/asm/pgtable_64_types.h | 3 ++-
> 3 files changed, 7 insertions(+), 2 deletions(-)
The patch is heavily whitespace and line wrap damaged :-(
Please send a properly titled, changelogged delta patch against tip:master (or
tip:x86/mm) to remove the CONFIG_X86 hack and fix the build bug.
Thanks,
Ingo
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