[PATCH] arch/arm64: elfcorehdr should be the first allocation

[Prabhakar Kushwaha]

From: Abhimanyu Saini <abhimanyu.saini at nxp.com>

elfcorehdr_addr is assigned by kexec-utils and device tree of
dump kernel is fixed in chosen node with parameter "linux,elfcorehdr".
So, memory should be first reserved for elfcorehdr,
otherwise overlaps may happen with other memory allocations
which were done before the allocation of elcorehdr in the crash kernel

Signed-off-by: Guanhua <guanhua.gao at nxp.com>
Signed-off-by: Poonam Aggrwal <poonam.aggrwal at nxp.com>
Signed-off-by: Abhimanyu Saini <abhimanyu.saini at nxp.com>
---
 arch/arm64/mm/init.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 5960bef0170d..551048cfcfff 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -453,6 +453,10 @@ void __init arm64_memblock_init(void)
 	 * Register the kernel text, kernel data, initrd, and initial
 	 * pagetables with memblock.
 	 */
+
+	/* make this the first reservation so that there are no chances of
+	 * overlap */
+	reserve_elfcorehdr();
 	memblock_reserve(__pa_symbol(_text), _end - _text);
 #ifdef CONFIG_BLK_DEV_INITRD
 	if (initrd_start) {
@@ -474,8 +478,6 @@ void __init arm64_memblock_init(void)
 
 	reserve_crashkernel();
 
-	reserve_elfcorehdr();
-
 	dma_contiguous_reserve(arm64_dma_phys_limit);
 
 	memblock_allow_resize();
-- 
2.14.1