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[v11,04/15] kexec_file: kexec_walk_memblock() only walks a dedicated region at kdump

Message ID 20180711074203.3019-5-takahiro.akashi@linaro.org (mailing list archive)
State New, archived
Headers show

Commit Message

AKASHI Takahiro July 11, 2018, 7:41 a.m. UTC 
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 <takahiro.akashi@linaro.org>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
---
 kernel/kexec_file.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

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) {