On arm64, no trampline code between old kernel and new kernel will be
required in kexec_file implementation. This patch introduces a new
configuration, ARCH_HAS_KEXEC_PURGATORY, and allows related code to be
compiled in only if necessary.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
---
arch/powerpc/Kconfig | 3 +++
arch/x86/Kconfig | 3 +++
kernel/kexec_file.c | 6 ++++++
3 files changed, 12 insertions(+)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 73ce5dd07642..c32a181a7cbb 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -552,6 +552,9 @@ config KEXEC_FILE
for kernel and initramfs as opposed to a list of segments as is the
case for the older kexec call.
+config ARCH_HAS_KEXEC_PURGATORY
+ def_bool KEXEC_FILE
+
config RELOCATABLE
bool "Build a relocatable kernel"
depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c1236b187824..f031c3efe47e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2019,6 +2019,9 @@ config KEXEC_FILE
for kernel and initramfs as opposed to list of segments as
accepted by previous system call.
+config ARCH_HAS_KEXEC_PURGATORY
+ def_bool KEXEC_FILE
+
config KEXEC_VERIFY_SIG
bool "Verify kernel signature during kexec_file_load() syscall"
depends on KEXEC_FILE
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index e5bcd94c1efb..990adae52151 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -26,7 +26,11 @@
#include <linux/vmalloc.h>
#include "kexec_internal.h"
+#ifdef CONFIG_ARCH_HAS_KEXEC_PURGATORY
static int kexec_calculate_store_digests(struct kimage *image);
+#else
+static int kexec_calculate_store_digests(struct kimage *image) { return 0; };
+#endif
/* Architectures can provide this probe function */
int __weak arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
@@ -520,6 +524,7 @@ int kexec_add_buffer(struct kexec_buf *kbuf)
return 0;
}
+#ifdef CONFIG_ARCH_HAS_KEXEC_PURGATORY
/* Calculate and store the digest of segments */
static int kexec_calculate_store_digests(struct kimage *image)
{
@@ -1022,3 +1027,4 @@ int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name,
return 0;
}
+#endif /* CONFIG_ARCH_HAS_KEXEC_PURGATORY */
--
2.16.2
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