Kexec-tools use mem=X@Y to pass usable memories to crash kernel, but in
commit a94e4f24ec836c8984f83959 ("MIPS: init: Drop boot_mem_map") all
BIOS passed memories are removed by early_parse_mem(). I think this is
reasonable for a normal kernel but not for a crash kernel, because a
crash kernel should be able to see all old memories, even though it is
not supposed to use them.
Fixes: a94e4f24ec836c8984f83959 ("MIPS: init: Drop boot_mem_map")
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
---
arch/mips/kernel/setup.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 4c04a86..e2804a2 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -392,8 +392,10 @@ static int __init early_parse_mem(char *p)
*/
if (usermem == 0) {
usermem = 1;
+#ifndef CONFIG_CRASH_DUMP
memblock_remove(memblock_start_of_DRAM(),
memblock_end_of_DRAM() - memblock_start_of_DRAM());
+#endif
}
start = 0;
size = memparse(p, &p);
--
2.7.0
