linux-kernel - [PATCH] MIPS: Fix unable to allocate memory for crashkernel

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Date:   Wed, 22 Jul 2020 18:24:38 +0800
From:   Jinyang He <hejinyang@...ngson.cn>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] MIPS: Fix unable to allocate memory for crashkernel

Use 0 as the align parameter in memblock_find_in_range() is
incorrect when we allocate memory for crashkernel. It's
finally used as by round_down(). Like this call tree:

mm/memblock.c

memblock_find_in_range
└── memblock_find_in_range_node
    ├── __memblock_find_range_bottom_up
    │   └── round_down
    └── __memblock_find_range_top_down
        └── round_down

However, the round_down's second parameter must be a power of 2.
The author mean not align. So change it from 0 to 1.

Signed-off-by: Jinyang He <hejinyang@...ngson.cn>
---
 arch/mips/kernel/setup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 7b537fa..588b212 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -497,7 +497,7 @@ static void __init mips_parse_crashkernel(void)
 	if (ret != 0 || crash_size <= 0)
 		return;
 
-	if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 0)) {
+	if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 1)) {
 		pr_warn("Invalid memory region reserved for crash kernel\n");
 		return;
 	}
-- 
2.1.0