linux-kernel - [RFC 1/5] x86/boot/e820: Fix memmap to parse with 1 argument

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Message-Id: <20250923153146.365015-2-fam.zheng@bytedance.com>
Date: Tue, 23 Sep 2025 15:31:42 +0000
From: Fam Zheng <fam.zheng@...edance.com>
To: linux-kernel@...r.kernel.org
Cc: Lukasz Luba <lukasz.luba@....com>,
	linyongting@...edance.com,
	songmuchun@...edance.com,
	satish.kumar@...edance.com,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	yuanzhu@...edance.com,
	Ingo Molnar <mingo@...hat.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	fam.zheng@...edance.com,
	Zhang Rui <rui.zhang@...el.com>,
	fam@...hon.net,
	"H. Peter Anvin" <hpa@...or.com>,
	x86@...nel.org,
	liangma@...edance.com,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	guojinhui.liam@...edance.com,
	linux-pm@...r.kernel.org,
	Thom Hughes <thom.hughes@...edance.com>
Subject: [RFC 1/5] x86/boot/e820: Fix memmap to parse with 1 argument

From: Thom Hughes <thom.hughes@...edance.com>

This is needed because in the simplest case, parker Application Kernel
only gets one user e820 entry from memmap.

Signed-off-by: Thom Hughes <thom.hughes@...edance.com>
Signed-off-by: Fam Zheng <fam.zheng@...edance.com>
---
 arch/x86/kernel/e820.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 84264205dae5..05dfb192d4b9 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -330,7 +330,7 @@ int __init e820__update_table(struct e820_table *table)
 
 	/* If there's only one memory region, don't bother: */
 	if (table->nr_entries < 2)
-		return -1;
+		return 0;
 
 	BUG_ON(table->nr_entries > max_nr_entries);
 
-- 
2.39.5