linux-kernel - Re: linux-next: build warning after merge of the akpm-current tree

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Date:   Wed, 13 Apr 2022 00:20:09 -0600
From:   Yu Zhao <yuzhao@...gle.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warning after merge of the akpm-current tree

On Wed, Apr 13, 2022 at 03:15:13PM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the akpm-current tree, today's linux-next build (i386
> defconfig) produced this warning:
> 
> WARNING: unmet direct dependencies detected for ARCH_HAS_NONLEAF_PMD_YOUNG
>   Depends on [n]: PGTABLE_LEVELS [=2]>2
>   Selected by [y]:
>   - X86 [=y]
> 
> Introduced by commit
> 
>   7613417c58a8 ("mm: x86: add CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG")

Sorry about the hassle. I'll fix it up in the next version. Meanwhile,
mind applying this so that it doesn't block your progress? Thanks.

diff --git a/arch/Kconfig b/arch/Kconfig
index c626bed3553d..1f0f39262d84 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1380,7 +1380,6 @@ config HAVE_ARCH_NODE_DEV_GROUP
 
 config ARCH_HAS_NONLEAF_PMD_YOUNG
 	bool
-	depends on PGTABLE_LEVELS > 2
 	help
 	  Architectures that select this option are capable of setting the
 	  accessed bit in non-leaf PMD entries when using them as part of linear
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 42c84e1ad73f..a2110f3c3209 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -86,7 +86,7 @@ config X86
 	select ARCH_HAS_PMEM_API		if X86_64
 	select ARCH_HAS_PTE_DEVMAP		if X86_64
 	select ARCH_HAS_PTE_SPECIAL
-	select ARCH_HAS_NONLEAF_PMD_YOUNG
+	select ARCH_HAS_NONLEAF_PMD_YOUNG	if PGTABLE_LEVELS > 2
 	select ARCH_HAS_UACCESS_FLUSHCACHE	if X86_64
 	select ARCH_HAS_COPY_MC			if X86_64
 	select ARCH_HAS_SET_MEMORY