linux-kernel - Re: [PATCH] x86: fixmap: use CONFIG_NR_CPUS instead of NR

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Date:   Thu, 27 May 2021 14:53:28 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Tom Rix <trix@...hat.com>
Subject: Re: [PATCH] x86: fixmap: use CONFIG_NR_CPUS instead of NR_CPUS

On Wed, May 26, 2021 at 10:59:51AM -0700, Randy Dunlap wrote:
> >  - Once early_ioremap.h is gone from io.h, it's potentially possible to 
> >    include <linux/threads.h>. More work to resolve dependencies might be 
> >    needed though.
> 
> Yes, my first patch for this (unsent) just included <linux/threads.h>
> in fixmap.h unconditionally instead of conditionally.
> 
> > Frankly, I'd prefer if such a low level header dependencies change came in 
> > via the x86 tree so we can properly review it, test it, and keep it 
> > working. Right now I can only guess what is needed here...
> 
> Sure, makes sense.
> 
> Mel, do you have any patch suggestions here?  re:

For whatever reason, I do not see the same build warnings you report.

Dropping "mm/early_ioremap: add prototype for early_memremap_pgprot_adjust"
is one option. Alternatively, this should also work and it's a more
sensible dependency.

diff --git a/include/asm-generic/early_ioremap.h b/include/asm-generic/early_ioremap.h
index 022f8f908b42..d95c693de640 100644
--- a/include/asm-generic/early_ioremap.h
+++ b/include/asm-generic/early_ioremap.h
@@ -3,7 +3,7 @@
 #define _ASM_EARLY_IOREMAP_H_
 
 #include <linux/types.h>
-#include <asm/fixmap.h>
+#include <linux/pgtable.h>
 
 /*
  * early_ioremap() and early_iounmap() are for temporary early boot-time

-- 
Mel Gorman
SUSE Labs