linux-kernel - linux-next: build failure after merge of the kbuild tree

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Date:   Fri, 14 Oct 2022 12:42:17 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: linux-next: build failure after merge of the kbuild tree

Hi all,

After merging the kbuild tree, today's linux-next build (i386 defconfig)
failed like this:

In file included from arch/x86/kernel/head_32.S:29:
arch/x86/include/asm/pgtable_32.h:68:5: error: "PTRS_PER_PMD" is not defined, evaluates to 0 [-Werror=undef]
   68 | #if PTRS_PER_PMD > 1
      |     ^~~~~~~~~~~~
cc1: all warnings being treated as errors

Exposed by commit

  0a7606a9832a ("kbuild: move -Wundef from KBUILD_CFLAGS to KBUILD_CPPFLAGS")

I have no idea what the root cause is. :-(

It is a great pity that this commit was not in linux-next before the
merge window opened. :-(

I have applied the following hack for today.

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Fri, 14 Oct 2022 12:34:34 +1100
Subject: [PATCH] i386: hack for "kbuild: move -Wundef from KBUILD_CFLAGS to KBUILD_CPPFLAGS"

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 arch/x86/include/asm/pgtable_32.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/pgtable_32.h b/arch/x86/include/asm/pgtable_32.h
index 7c9c968a42ef..0f3f186ca140 100644
--- a/arch/x86/include/asm/pgtable_32.h
+++ b/arch/x86/include/asm/pgtable_32.h
@@ -65,7 +65,7 @@ do {						\
  * With PAE paging (PTRS_PER_PMD > 1), we allocate PTRS_PER_PGD == 4 pages for
  * the PMD's in addition to the pages required for the last level pagetables.
  */
-#if PTRS_PER_PMD > 1
+#if defined(PTRS_PER_PMD) && (PTRS_PER_PMD > 1)
 #define PAGE_TABLE_SIZE(pages) (((pages) / PTRS_PER_PMD) + PTRS_PER_PGD)
 #else
 #define PAGE_TABLE_SIZE(pages) ((pages) / PTRS_PER_PGD)
-- 
2.35.1

-- 
Cheers,
Stephen Rothwell

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