+ kexec-print-out-debugging-message-if-required-for-kexec_load.patch added to mm-nonmm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: kexec: print out debugging message if required for kexec_load
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     kexec-print-out-debugging-message-if-required-for-kexec_load.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kexec-print-out-debugging-message-if-required-for-kexec_load.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Qiang Ma <maqianga@uniontech.com>
Subject: kexec: print out debugging message if required for kexec_load
Date: Mon, 3 Nov 2025 14:34:39 +0800

The commit a85ee18c7900 ("kexec_file: print out debugging message if
required") has added general code printing in kexec_file_load(), but not
in kexec_load().

Especially in the RISC-V architecture, kexec_image_info() has been
removed(commit eb7622d908a0 ("kexec_file, riscv: print out debugging
message if required")).  As a result, when using '-d' for the kexec_load
interface, print nothing in the kernel space.  This might be helpful for
verifying the accuracy of the data passed to the kernel.  Therefore, refer
to this commit a85ee18c7900 ("kexec_file: print out debugging message if
required"), debug print information has been added.

Link: https://lkml.kernel.org/r/20251103063440.1681657-4-maqianga@uniontech.com
Signed-off-by: Qiang Ma <maqianga@uniontech.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202510310332.6XrLe70K-lkp@intel.com/
Cc: Alexander Graf <graf@amazon.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Changyuan Lyu <changyuanl@google.com>
Cc: Mike Rapoport <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/kexec.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

--- a/kernel/kexec.c~kexec-print-out-debugging-message-if-required-for-kexec_load
+++ a/kernel/kexec.c
@@ -154,7 +154,15 @@ static int do_kexec_load(unsigned long e
 	if (ret)
 		goto out;
 
+	kexec_dprintk("nr_segments = %lu\n", nr_segments);
 	for (i = 0; i < nr_segments; i++) {
+		struct kexec_segment *ksegment;
+
+		ksegment = &image->segment[i];
+		kexec_dprintk("segment[%lu]: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
+			      i, ksegment->buf, ksegment->bufsz, ksegment->mem,
+			      ksegment->memsz);
+
 		ret = kimage_load_segment(image, i);
 		if (ret)
 			goto out;
@@ -166,6 +174,9 @@ static int do_kexec_load(unsigned long e
 	if (ret)
 		goto out;
 
+	kexec_dprintk("kexec_load: type:%u, start:0x%lx head:0x%lx flags:0x%lx\n",
+		      image->type, image->start, image->head, flags);
+
 	/* Install the new kernel and uninstall the old */
 	image = xchg(dest_image, image);
 
_

Patches currently in -mm which might be from maqianga@uniontech.com are

kexec-fix-uninitialized-struct-kimage-image-pointer.patch
kexec-add-kexec_core-flag-to-control-debug-printing.patch
kexec-print-out-debugging-message-if-required-for-kexec_load.patch
kexec_file-fix-the-issue-of-mismatch-between-loop-variable-types.patch