linux-kernel - [PATCH 2/2] x86/Kconfig: deprecate DISCONTIGMEM support for 32-bit

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Message-Id: <1556112252-9339-3-git-send-email-rppt@linux.ibm.com>
Date:   Wed, 24 Apr 2019 16:24:12 +0300
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     x86@...nel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...hsingularity.net>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Mike Rapoport <rppt@...ux.ibm.com>
Subject: [PATCH 2/2] x86/Kconfig: deprecate DISCONTIGMEM support for 32-bit

Mel Gorman says:
  32-bit NUMA systems should be non-existent in practice.  The last NUMA
  system I'm aware of that was both NUMA and 32-bit only died somewhere
  between 2004 and 2007. If someone is running a 64-bit capable system in
  32-bit mode with NUMA, they really are just punishing themselves for fun.

Mark DISCONTIGMEM broken for now and remove it in a couple of releases.

Suggested-by: Christoph Hellwig <hch@...radead.org>
Suggested-by: Mel Gorman <mgorman@...hsingularity.net>
Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
---
 arch/x86/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5662a3e..bd6f93c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1606,8 +1606,9 @@ config ARCH_FLATMEM_ENABLE
 	depends on X86_32 && !NUMA
 
 config ARCH_DISCONTIGMEM_ENABLE
-	def_bool y
+	def_bool n
 	depends on NUMA && X86_32
+	depends on BROKEN
 
 config ARCH_SPARSEMEM_ENABLE
 	def_bool y
-- 
2.7.4