linux-kernel - Re: [PATCH v2 3/6] mm: Kconfig: group swap, slab, hotplug and thp options into submenus

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Date:   Wed, 11 May 2022 12:28:57 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Michal Hocko <mhocko@...e.com>, Roman Gushchin <guro@...com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Seth Jennings <sjenning@...hat.com>,
        Dan Streetman <ddstreet@...e.org>,
        Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH v2 3/6] mm: Kconfig: group swap, slab, hotplug and thp
 options into submenus

On Wed, May 11, 2022 at 11:22:59AM -0400, Johannes Weiner wrote:
> On Tue, May 10, 2022 at 03:40:37PM -0700, Andrew Morton wrote:
> > On Tue, 10 May 2022 11:28:44 -0400 Johannes Weiner <hannes@...xchg.org> wrote:
> > 
> > > There are several clusters of related config options spread throughout
> > > the mostly flat MM submenu. Group them together and put specialization
> > > options into further subdirectories to make the MM submenu a bit more
> > > organized and easier to navigate.
> > 
> > Causes
> > 
> > hp2:/usr/src/25> make allnoconfig
> 
> My bad. I'll respin those on top of the others and add allnoconfig
> builds to my testing routine. Thanks.

Actually, this is rather straight-forward to fix in place. This delta
for 3/6 takes care of both warnings:

---
>From 2b5fcaed2714584b40c7d7f76bdda250aa94b48f Mon Sep 17 00:00:00 2001
From: Johannes Weiner <hannes@...xchg.org>
Date: Wed, 11 May 2022 12:12:37 -0400
Subject: [PATCH] mm: Kconfig: group swap, slab, hotplug and thp options into
 submenus fix

WARNING: unmet direct dependencies detected for ARCH_WANT_GENERAL_HUGETLB
  Depends on [n]: TRANSPARENT_HUGEPAGE [=n]
  Selected by [y]:
  - X86 [=y]

WARNING: unmet direct dependencies detected for ARCH_WANTS_THP_SWAP
  Depends on [n]: TRANSPARENT_HUGEPAGE [=n]
  Selected by [y]:
  - X86 [=y] && X86_64 [=y]

The ARCH_WANT* symbols are selected by the arch to communicate
requests to THP if enabled. Those mustn't be inside the 'if THP' block
for user-visible THP options of course. Move them back out.

Reported-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
 mm/Kconfig | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index 2c5935a28edf..c2f4a547ab00 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -692,6 +692,12 @@ config NOMMU_INITIAL_TRIM_EXCESS
 
 	  See Documentation/admin-guide/mm/nommu-mmap.rst for more information.
 
+config ARCH_WANT_GENERAL_HUGETLB
+	bool
+
+config ARCH_WANTS_THP_SWAP
+	def_bool n
+
 menuconfig TRANSPARENT_HUGEPAGE
 	bool "Transparent Hugepage Support"
 	depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE && !PREEMPT_RT
@@ -733,12 +739,6 @@ choice
 	  benefit.
 endchoice
 
-config ARCH_WANT_GENERAL_HUGETLB
-	bool
-
-config ARCH_WANTS_THP_SWAP
-	def_bool n
-
 config THP_SWAP
 	def_bool y
 	depends on TRANSPARENT_HUGEPAGE && ARCH_WANTS_THP_SWAP && SWAP
-- 
2.35.3