linux-kernel - [PATCH v4 2/4] memblock: Introduce memblock_mem_range_remove

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Message-Id: <1646108941-27919-3-git-send-email-yangtiezhu@loongson.cn>
Date:   Tue,  1 Mar 2022 12:28:59 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Xuefeng Li <lixuefeng@...ngson.cn>, linux-mips@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 2/4] memblock: Introduce memblock_mem_range_remove_map()

This is preparation for supporting memmap=limit@...e parameter,
no functionality change.

Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 include/linux/memblock.h | 1 +
 mm/memblock.c            | 9 +++++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 50ad196..e558d2c 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -482,6 +482,7 @@ phys_addr_t memblock_end_of_DRAM(void);
 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size);
 void memblock_mem_limit_remove_map(phys_addr_t limit);
+void memblock_mem_range_remove_map(phys_addr_t base, phys_addr_t limit);
 bool memblock_is_memory(phys_addr_t addr);
 bool memblock_is_map_memory(phys_addr_t addr);
 bool memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
diff --git a/mm/memblock.c b/mm/memblock.c
index 1018e50..2476d15d 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1723,7 +1723,7 @@ void __init memblock_cap_memory_range(phys_addr_t base, phys_addr_t size)
 			base + size, PHYS_ADDR_MAX);
 }
 
-void __init memblock_mem_limit_remove_map(phys_addr_t limit)
+void __init memblock_mem_range_remove_map(phys_addr_t base, phys_addr_t limit)
 {
 	phys_addr_t max_addr;
 
@@ -1736,7 +1736,12 @@ void __init memblock_mem_limit_remove_map(phys_addr_t limit)
 	if (max_addr == PHYS_ADDR_MAX)
 		return;
 
-	memblock_cap_memory_range(0, max_addr);
+	memblock_cap_memory_range(base, max_addr);
+}
+
+void __init memblock_mem_limit_remove_map(phys_addr_t limit)
+{
+	memblock_mem_range_remove_map(0, limit);
 }
 
 static int __init_memblock memblock_search(struct memblock_type *type, phys_addr_t addr)
-- 
2.1.0