[PATCH 04/10] arm64: use more granular reservations for static page table allocations

[ard.biesheuvel@linaro.org (Ard Biesheuvel)]

Before introducing new statically allocated page tables and increasing
their alignment in subsequent patches, update the reservation logic
so that only pages that are in actual use end up as reserved with
memblock.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 arch/arm64/mm/init.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index a3469a436a73..373ea02bdb96 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -37,6 +37,7 @@
 
 #include <asm/fixmap.h>
 #include <asm/memory.h>
+#include <asm/mmu_context.h>
 #include <asm/sections.h>
 #include <asm/setup.h>
 #include <asm/sizes.h>
@@ -173,11 +174,13 @@ void __init arm64_memblock_init(void)
 	 * Register the kernel text, kernel data, initrd, and initial
 	 * pagetables with memblock.
 	 */
-	memblock_reserve(__pa(_text), _end - _text);
+	memblock_reserve(__pa(_text), __bss_stop - _text);
 #ifdef CONFIG_BLK_DEV_INITRD
 	if (initrd_start)
 		memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
 #endif
+	memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE);
+	memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE);
 
 	if (!efi_enabled(EFI_MEMMAP))
 		early_init_fdt_scan_reserved_mem();
-- 
1.9.1