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

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Date:   Sat, 15 Sep 2018 19:28:03 +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 Sun, 16 Sep 2018, Feng Tang wrote:
> I have tried to change some header files incluing fixmap.h/apicdef.h/
> vsyscall.h, and most of the .c files compile fine now, but I can not
> use the "__end_of_permanent_fixed_addresses" in head_64.S as it is a 
> enum type, and could not be recognized by assembly code.

Hrmm. I did not think about the enum. So we have two possibilities:

1) Have some preprocessing which provides the info for the assembler

2) Use a constant for the number of PMDs which is defined in a header and
   then compile time checked against the size of the fixmap in a C-file.

#1 would be preferred, but for a quick fix #2 is okay as well.

Thanks,

	tglx