linux-kernel - [PATCH v11 04/15] kexec_file: kexec_walk_memblock() only walks a dedicated region at kdump

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Date:   Wed, 11 Jul 2018 16:41:52 +0900
From:   AKASHI Takahiro <takahiro.akashi@...aro.org>
To:     catalin.marinas@....com, will.deacon@....com, dhowells@...hat.com,
        vgoyal@...hat.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, dyoung@...hat.com, bhe@...hat.com,
        arnd@...db.de
Cc:     ard.biesheuvel@...aro.org, james.morse@....com,
        bhsharma@...hat.com, kexec@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        AKASHI Takahiro <takahiro.akashi@...aro.org>
Subject: [PATCH v11 04/15] kexec_file: kexec_walk_memblock() only walks a dedicated region at kdump

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@...aro.org>
Cc: Dave Young <dyoung@...hat.com>
Cc: Vivek Goyal <vgoyal@...hat.com>
Cc: Baoquan He <bhe@...hat.com>
---
 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