In kdump case, there exists only one dedicated memoblock region as usable
memory (crashk_res). With this patch, kexec_walk_memblock() runs a given
callback function on this region.

Signed-off-by: AKASHI Takahiro <[email protected]>
Cc: Dave Young <[email protected]>
Cc: Vivek Goyal <[email protected]>
Cc: Baoquan He <[email protected]>
---
 kernel/kexec_file.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index b088324fb3ad..ebf06c3e168d 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -511,6 +511,9 @@ static int kexec_walk_memblock(struct kexec_buf *kbuf,
        phys_addr_t mstart, mend;
        struct resource res = { };
 
+       if (kbuf->image->type == KEXEC_TYPE_CRASH)
+               return func(&crashk_res, kbuf);
+
        if (kbuf->top_down) {
                for_each_free_mem_range_reverse(i, NUMA_NO_NODE, 0,
                                                &mstart, &mend, NULL) {
-- 
2.17.0


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