On 02/26/18 at 07:01pm, AKASHI Takahiro wrote:

On Fri, Feb 23, 2018 at 05:24:59PM +0800, Dave Young wrote:

quoted

Hi AKASHI,

On 02/22/18 at 08:17pm, AKASHI Takahiro wrote:

quoted

As arch_kexec_kernel_*_{probe,load}(), arch_kimage_file_post_load_cleanup()
and arch_kexec_kernel_verify_sg can be parameterized with a kexec_file_ops
array and now duplicated among some architectures, let's factor them out.

Signed-off-by: AKASHI Takahiro <redacted>
Cc: Dave Young <redacted>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Thiago Jung Bauermann <redacted>
---
 arch/powerpc/include/asm/kexec.h            |  2 +-
 arch/powerpc/kernel/kexec_elf_64.c          |  2 +-
 arch/powerpc/kernel/machine_kexec_file_64.c | 39 ++------------------
 arch/x86/include/asm/kexec-bzimage64.h      |  2 +-
 arch/x86/kernel/kexec-bzimage64.c           |  2 +-
 arch/x86/kernel/machine_kexec_64.c          | 45 +----------------------
 include/linux/kexec.h                       | 15 ++++----
 kernel/kexec_file.c                         | 57 +++++++++++++++++++++++++++--
 8 files changed, 70 insertions(+), 94 deletions(-)

[snip]

quoted

diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 990adae52151..a6d14a768b3e 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c

@@ -26,34 +26,83 @@
 #include <linux/vmalloc.h>
 #include "kexec_internal.h"
 
+const __weak struct kexec_file_ops * const kexec_file_loaders[] = {NULL};
+
 #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
 
+int _kexec_kernel_image_probe(struct kimage *image, void *buf,
+			     unsigned long buf_len)
+{
+	const struct kexec_file_ops * const *fops;
+	int ret = -ENOEXEC;
+
+	for (fops = &kexec_file_loaders[0]; *fops && (*fops)->probe; ++fops) {
+		ret = (*fops)->probe(buf, buf_len);
+		if (!ret) {
+			image->fops = *fops;
+			return ret;
+		}
+	}
+
+	return ret;
+}
+
 /* Architectures can provide this probe function */
 int __weak arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
 					 unsigned long buf_len)
 {
-	return -ENOEXEC;
+	return _kexec_kernel_image_probe(image, buf, buf_len);

I vaguely remember previously I suggest split the _kexec_kernel_image_probe
because arch code can call them, and common code also use it like above.
But in your new series I do not find where else calls this function
except the common code arch_kexec_kernel_image_probe.  If nobody use
them then it is not worth to split them out, it is better to just embed
them in the __weak functions.

Powerpc's arch_kexec_kernel_image_probe() uses
_kexec_kekrnel_image_probe() as it needs an extra check to rule out
crash dump for now.

Oops, I missed that, but what about other similar functions? Such as:
_kexec_kernel_image_load
_kimage_file_post_load_cleanup
_kexec_kernel_verify_sig

Thanks,
-Takahiro AKASHI

quoted

Ditto for other similar functions.

[snip]

Thanks
Dave

Thanks
Dave