linux-kernel - [PATCH v2] RISC-V: Fix usage of memblock_enforce_memory

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Message-Id: <20201219001356.2887782-1-atish.patra@wdc.com>
Date:   Fri, 18 Dec 2020 16:13:56 -0800
From:   Atish Patra <atish.patra@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Atish Patra <atish.patra@....com>, stable@...r.kernel.org,
        Bin Meng <bin.meng@...driver.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anup Patel <anup.patel@....com>,
        linux-riscv@...ts.infradead.org, Mike Rapoport <rppt@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Bin Meng <bmeng.cn@...il.com>
Subject: [PATCH v2] RISC-V: Fix usage of memblock_enforce_memory_limit

memblock_enforce_memory_limit accepts the maximum memory size not the
maximum address that can be handled by kernel. Fix the function invocation
accordingly.

Fixes: 1bd14a66ee52 ("RISC-V: Remove any memblock representing unusable memory area")
Cc: stable@...r.kernel.org

Reported-by: Bin Meng <bin.meng@...driver.com>
Tested-by: Bin Meng <bin.meng@...driver.com>
Acked-by: Mike Rapoport <rppt@...ux.ibm.com>
Signed-off-by: Atish Patra <atish.patra@....com>
---
Changes from v1->v2:
1. Added stable-kernel in cc.
2. Added reported/tested by tag.
---
 arch/riscv/mm/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 13ba533f462b..bf5379135e39 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -176,7 +176,7 @@ void __init setup_bootmem(void)
 	 * Make sure that any memory beyond mem_start + (-PAGE_OFFSET) is removed
 	 * as it is unusable by kernel.
 	 */
-	memblock_enforce_memory_limit(mem_start - PAGE_OFFSET);
+	memblock_enforce_memory_limit(-PAGE_OFFSET);
 
 	/* Reserve from the start of the kernel to the end of the kernel */
 	memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
-- 
2.25.1