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

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Date:   Sun, 16 Sep 2018 00:47:31 +0800
From:   Feng Tang <feng.tang@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
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

Hi Thomas,

On Sat, Sep 15, 2018 at 12:29:50PM +0200, Thomas Gleixner wrote:
> 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.

Okay.

> 
> > 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?

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.

Thanks,
Feng

> 
> Thanks,
> 
> 	tglx