linux-kernel - [PATCH V2 1/2] mm/nobootmem: free_all

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Date:	Mon, 13 Jan 2014 13:49:00 +0100
From:	Philipp Hachtmann <phacht@...ux.vnet.ibm.com>
To:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Cc:	linux-mm@...ck.org, qiuxishi@...wei.com, dhowells@...hat.com,
	daeseok.youn@...il.com, liuj97@...il.com, yinghai@...nel.org,
	phacht@...ux.vnet.ibm.com, zhangyanfei@...fujitsu.com,
	santosh.shilimkar@...com, grygorii.strashko@...com,
	tangchen@...fujitsu.com
Subject: [PATCH V2 1/2] mm/nobootmem: free_all_bootmem again

get_allocated_memblock_reserved_regions_info() should work if it is
compiled in. Extended the ifdef around
get_allocated_memblock_memory_regions_info() to include
get_allocated_memblock_reserved_regions_info() as well.
Similar changes in nobootmem.c/free_low_memory_core_early() where
the two functions are called.

Signed-off-by: Philipp Hachtmann <phacht@...ux.vnet.ibm.com>
---
 mm/memblock.c  | 17 ++---------------
 mm/nobootmem.c |  4 ++--
 2 files changed, 4 insertions(+), 17 deletions(-)

diff --git a/mm/memblock.c b/mm/memblock.c
index 64ed243..9c0aeef 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -266,33 +266,20 @@ static void __init_memblock memblock_remove_region(struct memblock_type *type, u
 	}
 }
 
+#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
+
 phys_addr_t __init_memblock get_allocated_memblock_reserved_regions_info(
 					phys_addr_t *addr)
 {
 	if (memblock.reserved.regions == memblock_reserved_init_regions)
 		return 0;
 
-	/*
-	 * Don't allow nobootmem allocator to free reserved memory regions
-	 * array if
-	 *  - CONFIG_DEBUG_FS is enabled;
-	 *  - CONFIG_ARCH_DISCARD_MEMBLOCK is not enabled;
-	 *  - reserved memory regions array have been resized during boot.
-	 * Otherwise debug_fs entry "sys/kernel/debug/memblock/reserved"
-	 * will show garbage instead of state of memory reservations.
-	 */
-	if (IS_ENABLED(CONFIG_DEBUG_FS) &&
-	    !IS_ENABLED(CONFIG_ARCH_DISCARD_MEMBLOCK))
-		return 0;
-
 	*addr = __pa(memblock.reserved.regions);
 
 	return PAGE_ALIGN(sizeof(struct memblock_region) *
 			  memblock.reserved.max);
 }
 
-#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
-
 phys_addr_t __init_memblock get_allocated_memblock_memory_regions_info(
 					phys_addr_t *addr)
 {
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index 17c8902..e2906a5 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -122,13 +122,13 @@ static unsigned long __init free_low_memory_core_early(void)
 	for_each_free_mem_range(i, NUMA_NO_NODE, &start, &end, NULL)
 		count += __free_memory_core(start, end);
 
+#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
+
 	/* Free memblock.reserved array if it was allocated */
 	size = get_allocated_memblock_reserved_regions_info(&start);
 	if (size)
 		count += __free_memory_core(start, start + size);
 
-#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
-
 	/* Free memblock.memory array if it was allocated */
 	size = get_allocated_memblock_memory_regions_info(&start);
 	if (size)
-- 
1.8.4.5

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