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

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Date:   Sun, 22 Apr 2018 15:52:03 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dave Young <dyoung@...hat.com>,
        Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>,
        Simon Horman <horms@...ge.net.au>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.14 056/164] powerpc/kexec_file: Fix error code when trying to load kdump kernel

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

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

From: Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>

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@...r.kernel.org # v4.10+
Reported-by: Dave Young <dyoung@...hat.com>
Signed-off-by: Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>
Reviewed-by: Simon Horman <horms@...ge.net.au>
Reviewed-by: Dave Young <dyoung@...hat.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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];