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Subject[PATCH v16 05/16] kexec_file: kexec_walk_memblock() only walks a dedicated region at kdump
Date
In kdump case, there exists only one dedicated memblock region as usable
memory (crashk_res). With this patch, kexec_walk_memblock() runs a given
callback function on this region.

Cosmetic change: 0 to MEMBLOCK_NONE at for_each_free_mem_range*()

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Acked-by: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
---
kernel/kexec_file.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index d03195a8cb6e..f1d0e00a3971 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -515,8 +515,11 @@ 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,
+ for_each_free_mem_range_reverse(i, NUMA_NO_NODE, MEMBLOCK_NONE,
&mstart, &mend, NULL) {
/*
* In memblock, end points to the first byte after the
@@ -530,8 +533,8 @@ static int kexec_walk_memblock(struct kexec_buf *kbuf,
break;
}
} else {
- for_each_free_mem_range(i, NUMA_NO_NODE, 0, &mstart, &mend,
- NULL) {
+ for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE,
+ &mstart, &mend, NULL) {
/*
* In memblock, end points to the first byte after the
* range while in kexec, end points to the last byte
--
2.19.0
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