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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 03/16] s390, kexec_file: drop arch_kexec_mem_walk()
Date:   Wed,  1 Aug 2018 16:58:07 +0900
Message-Id: <20180801075820.3753-4-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

Since s390 already knows where to locate buffers, calling
arch_kexec_mem_walk() has no sense. So we can just drop it as kbuf->mem
indicates this while all other architectures sets it to 0 initially.

This change is a preparatory work for the next patch, where all the
variant memory walks, either on system resource or memblock, will be
put in one common place so that it will satisfy all the architectures'
need.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Philipp Rudo <prudo@linux.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
---
 arch/s390/kernel/machine_kexec_file.c | 10 ----------
 kernel/kexec_file.c                   |  4 ++++
 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/arch/s390/kernel/machine_kexec_file.c b/arch/s390/kernel/machine_kexec_file.c
index f413f57f8d20..32023b4f9dc0 100644
--- a/arch/s390/kernel/machine_kexec_file.c
+++ b/arch/s390/kernel/machine_kexec_file.c
@@ -134,16 +134,6 @@ int kexec_file_add_initrd(struct kimage *image, struct s390_load_data *data,
 	return ret;
 }
 
-/*
- * The kernel is loaded to a fixed location. Turn off kexec_locate_mem_hole
- * and provide kbuf->mem by hand.
- */
-int arch_kexec_walk_mem(struct kexec_buf *kbuf,
-			int (*func)(struct resource *, void *))
-{
-	return 1;
-}
-
 int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
 				     Elf_Shdr *section,
 				     const Elf_Shdr *relsec,
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 63c7ce1c0c3e..bf39df5e5bb9 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -534,6 +534,10 @@ int kexec_locate_mem_hole(struct kexec_buf *kbuf)
 {
 	int ret;
 
+	/* Arch knows where to place */
+	if (kbuf->mem)
+		return 0;
+
 	ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);
 
 	return ret == 1 ? 0 : -EADDRNOTAVAIL;
-- 
2.18.0