linux-kernel - [PATCH 1/2] x86/mm: support memory-failure on 32-bits with SPARSEMEM

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Message-ID: <20251103033536.52234-1-xieyuanbin1@huawei.com>
Date: Mon, 3 Nov 2025 11:35:35 +0800
From: Xie Yuanbin <xieyuanbin1@...wei.com>
To: <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>, <hpa@...or.com>, <akpm@...ux-foundation.org>,
	<david@...hat.com>, <lorenzo.stoakes@...cle.com>, <Liam.Howlett@...cle.com>,
	<vbabka@...e.cz>, <rppt@...nel.org>, <surenb@...gle.com>, <mhocko@...e.com>,
	<linmiaohe@...wei.com>, <nao.horiguchi@...il.com>, <luto@...nel.org>,
	<peterz@...radead.org>, <tony.luck@...el.com>
CC: <x86@...nel.org>, <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-edac@...r.kernel.org>, <will@...nel.org>, <liaohua4@...wei.com>,
	<lilinjie8@...wei.com>, Xie Yuanbin <xieyuanbin1@...wei.com>
Subject: [PATCH 1/2] x86/mm: support memory-failure on 32-bits with SPARSEMEM

The historical commit d949f36f1865c60239d4 ("x86: Fix hwpoison code
related build failure on 32-bit NUMAQ"), disabled x86_32's
memory-failure when SPARSEMEM is enabled, because the number of
page-flags are insufficient.

The commit 09022bc196d23484a7a5 ("mm: remove PG_error") removes a
page flag, so memory-failure can now be enable now.

Signed-off-by: Xie Yuanbin <xieyuanbin1@...wei.com>
---
 arch/x86/Kconfig | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d55c01efd7c2..f9ee57a55500 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -750,13 +750,10 @@ config IOSF_MBI_DEBUG
 
 config X86_SUPPORTS_MEMORY_FAILURE
 	def_bool y
 	# MCE code calls memory_failure():
 	depends on X86_MCE
-	# On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
-	# On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
-	depends on X86_64 || !SPARSEMEM
 	select ARCH_SUPPORTS_MEMORY_FAILURE
 
 config X86_32_IRIS
 	tristate "Eurobraille/Iris poweroff module"
 	depends on X86_32
-- 
2.51.0