linux-kernel - [PATCH AUTOSEL 5.10 023/114] um: Update min_low_pfn to match changes in uml

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Message-Id: <20250505231817.2697367-23-sashal@kernel.org>
Date: Mon,  5 May 2025 19:16:46 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Tiwei Bie <tiwei.btw@...group.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Sasha Levin <sashal@...nel.org>,
	richard@....at,
	anton.ivanov@...bridgegreys.com,
	johannes@...solutions.net,
	akpm@...ux-foundation.org,
	rppt@...nel.org,
	dave.hansen@...ux.intel.com,
	benjamin.berg@...el.com,
	richard.weiyang@...il.com,
	kevin.brodsky@....com,
	linux-um@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.10 023/114] um: Update min_low_pfn to match changes in uml_reserved

From: Tiwei Bie <tiwei.btw@...group.com>

[ Upstream commit e82cf3051e6193f61e03898f8dba035199064d36 ]

When uml_reserved is updated, min_low_pfn must also be updated
accordingly. Otherwise, min_low_pfn will not accurately reflect
the lowest available PFN.

Signed-off-by: Tiwei Bie <tiwei.btw@...group.com>
Link: https://patch.msgid.link/20250221041855.1156109-1-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/um/kernel/mem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index 9242dc91d7519..268a238f4f9cf 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -49,6 +49,7 @@ void __init mem_init(void)
 	map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0);
 	memblock_free(__pa(brk_end), uml_reserved - brk_end);
 	uml_reserved = brk_end;
+	min_low_pfn = PFN_UP(__pa(uml_reserved));
 
 	/* this will put all low memory onto the freelists */
 	memblock_free_all();
-- 
2.39.5