linux-kernel - [PATCH AUTOSEL 4.19 3/6] microblaze: don't treat zero reserved memory regions as error

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Message-ID: <20240903192937.1109185-3-sashal@kernel.org>
Date: Tue,  3 Sep 2024 15:29:23 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Mike Rapoport <rppt@...nel.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Wei Yang <richard.weiyang@...il.com>,
	Sasha Levin <sashal@...nel.org>,
	monstr@...str.eu
Subject: [PATCH AUTOSEL 4.19 3/6] microblaze: don't treat zero reserved memory regions as error

From: Mike Rapoport <rppt@...nel.org>

[ Upstream commit 0075df288dd8a7abfe03b3766176c393063591dd ]

Before commit 721f4a6526da ("mm/memblock: remove empty dummy entry") the
check for non-zero of memblock.reserved.cnt in mmu_init() would always
be true either because  memblock.reserved.cnt is initialized to 1 or
because there were memory reservations earlier.

The removal of dummy empty entry in memblock caused this check to fail
because now memblock.reserved.cnt is initialized to 0.

Remove the check for non-zero of memblock.reserved.cnt because it's
perfectly fine to have an empty memblock.reserved array that early in
boot.

Reported-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Mike Rapoport <rppt@...nel.org>
Reviewed-by: Wei Yang <richard.weiyang@...il.com>
Tested-by: Guenter Roeck <linux@...ck-us.net>
Link: https://lore.kernel.org/r/20240729053327.4091459-1-rppt@kernel.org
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/microblaze/mm/init.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
index df6de7ccdc2eb..ecad6d8b9154b 100644
--- a/arch/microblaze/mm/init.c
+++ b/arch/microblaze/mm/init.c
@@ -289,11 +289,6 @@ asmlinkage void __init mmu_init(void)
 {
 	unsigned int kstart, ksize;
 
-	if (!memblock.reserved.cnt) {
-		pr_emerg("Error memory count\n");
-		machine_restart(NULL);
-	}
-
 	if ((u32) memblock.memory.regions[0].size < 0x400000) {
 		pr_emerg("Memory must be greater than 4MB\n");
 		machine_restart(NULL);
-- 
2.43.0