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

From: AKASHI Takahiro <takahiro.akashi@linaro.org>
To: catalin.marinas@arm.com, will.deacon@arm.com,
	dhowells@redhat.com, vgoyal@redhat.com,
	herbert@gondor.apana.org.au, davem@davemloft.net,
	dyoung@redhat.com, bhe@redhat.com, arnd@arndb.de
Cc: ard.biesheuvel@linaro.org, james.morse@arm.com,
	bhsharma@redhat.com, kexec@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	AKASHI Takahiro <takahiro.akashi@linaro.org>
Subject: [PATCH v11 04/15] kexec_file: kexec_walk_memblock() only walks a dedicated region at kdump
Date: Wed, 11 Jul 2018 16:41:52 +0900	[thread overview]
Message-ID: <20180711074203.3019-5-takahiro.akashi@linaro.org> (raw)
In-Reply-To: <20180711074203.3019-1-takahiro.akashi@linaro.org>

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(+)

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

