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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, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com
Cc:     prudo@linux.ibm.com, 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 v13 05/16] kexec_file: kexec_walk_memblock() only walks a dedicated region at kdump
Date:   Wed,  1 Aug 2018 16:58:09 +0900
Message-Id: <20180801075820.3753-6-takahiro.akashi@linaro.org>
In-Reply-To: <20180801075820.3753-1-takahiro.akashi@linaro.org>
References: <20180801075820.3753-1-takahiro.akashi@linaro.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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>
Cc: 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 1073ef56a95d..370d7d8ff27f 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -511,8 +511,11 @@ 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
@@ -526,8 +529,8 @@ 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
-- 
2.18.0