linux-kernel - Re: [PATCH] x86, mm: Reserver some memory for bootmem allocator for NO

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Date:   Sat, 15 Sep 2018 12:29:50 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Feng Tang <feng.tang@...el.com>
cc:     Michal Hocko <mhocko@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Ingo Molnar <mingo@...e.hu>,
        "H . Peter Anvin" <hpa@...ux.intel.com>,
        Yinghai Lu <yinghai@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] x86, mm: Reserver some memory for bootmem allocator for
 NO_BOOTMEM

On Tue, 11 Sep 2018, Feng Tang wrote:
> Thanks for the suggestion, and I have 2 patches: one adds a build warning,   
> the other prepares fixmap page table on demand and doesn't need warning.

The latter please.

> But I met a problem, that the "__end_of_permanent_fixed_addresses" is
> defined in fixmap.h, which is protected by #ifndef __ASSEMBLY__, also
> fixmap.h reference many other header file, which makes it harder to
> extract the definition out. Any suggestion on this? thanks!

What prevents you from moving the enum out of the __ASSEMBLY__ protected
section aside of a bit of careful work?

Thanks,

	tglx