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.

[akpm@linux-foundation.org: cleanup]
Signed-off-by: Philipp Hachtmann <phacht@linux.vnet.ibm.com>
Cc: qiuxishi <qiuxishi@huawei.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Daeseok Youn <daeseok.youn@gmail.com>
Cc: Jiang Liu <liuj97@gmail.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memblock.c b/mm/memblock.c
index 64ed243..9c0aeef 100644 (file)
--- 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..f73f298 100644 (file)
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -116,23 +116,26 @@ static unsigned long __init __free_memory_core(phys_addr_t start,
 static unsigned long __init free_low_memory_core_early(void)
 {
        unsigned long count = 0;
-       phys_addr_t start, end, size;
+       phys_addr_t start, end;
        u64 i;
 
        for_each_free_mem_range(i, NUMA_NO_NODE, &start, &end, NULL)
                count += __free_memory_core(start, end);
 
-       /* 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)
-               count += __free_memory_core(start, start + size);
+       {
+               phys_addr_t size;
+
+               /* 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);
+
+               /* Free memblock.memory array if it was allocated */
+               size = get_allocated_memblock_memory_regions_info(&start);
+               if (size)
+                       count += __free_memory_core(start, start + size);
+       }
 #endif
 
        return count;