linux-kernel - Re: [PROBLEM] ./arch/x86/include/asm/pgtable_32.h:59:5: error: "PTRS_PER_PMD" is not defined, evaluates to 0 [-Werror=undef]

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Message-ID: <20240708094958.GAZou2Rq4bCMCVln1C@fat_crate.local>
Date: Mon, 8 Jul 2024 11:49:58 +0200
From: Borislav Petkov <bp@...en8.de>
To: Mirsad Todorovac <mtodorovac69@...il.com>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>, Yuntao Wang <ytcoode@...il.com>,
	Breno Leitao <leitao@...ian.org>, Brian Gerst <brgerst@...il.com>,
	Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: [PROBLEM] ./arch/x86/include/asm/pgtable_32.h:59:5: error:
 "PTRS_PER_PMD" is not defined, evaluates to 0 [-Werror=undef]

On Fri, Jul 05, 2024 at 11:52:30PM +0200, Mirsad Todorovac wrote:
> Hi, all!
> 
> This is the result of testing randconfig with KCONFIG_SEED=0xEE7AB52F in next-20240703 vanilla tree on
> Ubuntu 22.04 LTS. GCC used is gcc (Ubuntu 12.3.0-1ubuntu1~22.04) 12.3.0.
> 
> The particular error is as follows:
> 
> In file included from arch/x86/kernel/head_32.S:29:
> ./arch/x86/include/asm/pgtable_32.h:59:5: error: "PTRS_PER_PMD" is not defined, evaluates to 0 [-Werror=undef]
>    59 | #if PTRS_PER_PMD > 1
>       |     ^~~~~~~~~~~~
> cc1: all warnings being treated as errors

I can't reproduce that with your config ontop of

commit 0b58e108042b0ed28a71cd7edf5175999955b233 (HEAD, tag: refs/tags/next-20240703, refs/remotes/linux-next/master)
Author: Stephen Rothwell <sfr@...b.auug.org.au>
Date:   Wed Jul 3 16:14:20 2024 +1000

    Add linux-next specific files for 20240703
    
    Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>

$ make ARCH=i386 -j128 CC=gcc HOSTCC=gcc
...

  OBJCOPY arch/x86/boot/setup.bin
  BUILD   arch/x86/boot/bzImage
Kernel: arch/x86/boot/bzImage is ready  (#1)

Something's missing.

Did you do

$ git clean -dqfx

before building?

Note that that cmd will clear *everything* so you better check your local tree
before you run it:

$ git status

and then

$ git clean -dqfx

after having saved the files which you still need.

HTH.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette