[PATCH 4.14 056/164] powerpc/kexec_file: Fix error code when trying to load kdump kernel

From: Greg Kroah-Hartman
Date: Sun Apr 22 2018 - 10:05:53 EST


4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxxxxxxx>

commit bf8a1abc3ddbd6e9a8312ea7d96e5dd89c140f18 upstream.

kexec_file_load() on powerpc doesn't support kdump kernels yet, so it
returns -ENOTSUPP in that case.

I've recently learned that this errno is internal to the kernel and
isn't supposed to be exposed to userspace. Therefore, change to
-EOPNOTSUPP which is defined in an uapi header.

This does indeed make kexec-tools happier. Before the patch, on
ppc64le:

# ~bauermann/src/kexec-tools/build/sbin/kexec -s -p /boot/vmlinuz
kexec_file_load failed: Unknown error 524

After the patch:

# ~bauermann/src/kexec-tools/build/sbin/kexec -s -p /boot/vmlinuz
kexec_file_load failed: Operation not supported

Fixes: a0458284f062 ("powerpc: Add support code for kexec_file_load()")
Cc: stable@xxxxxxxxxxxxxxx # v4.10+
Reported-by: Dave Young <dyoung@xxxxxxxxxx>
Signed-off-by: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxxxx>
Reviewed-by: Dave Young <dyoung@xxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
arch/powerpc/kernel/machine_kexec_file_64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/kernel/machine_kexec_file_64.c
+++ b/arch/powerpc/kernel/machine_kexec_file_64.c
@@ -43,7 +43,7 @@ int arch_kexec_kernel_image_probe(struct

/* We don't support crash kernels yet. */
if (image->type == KEXEC_TYPE_CRASH)
- return -ENOTSUPP;
+ return -EOPNOTSUPP;

for (i = 0; i < ARRAY_SIZE(kexec_file_loaders); i++) {
fops = kexec_file_loaders[i];