Re: [PATCH v3 02/17] kexec: Extract kexec_free_segment_cma() from kimage_free_cma()

kimage_free_cma() relies on image->nr_segments to iterate over segments.
When an architecture loader (e.g., arm64) truncates nr_segments on a
mid-way failure, CMA pages allocated beyond the new boundary become
unreachable, causing silent memory leaks.

Extract the per-segment freeing logic into the exported helper
kexec_free_segment_cma(), so that architecture loaders can release
individual segments before nr_segments is truncated. Refactor
kimage_free_cma() to loop over the new helper, preserving existing
behavior.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Pratyush Yadav <pratyush@kernel.org>
Signed-off-by: Jinjie Ruan <redacted>

diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 83c296c0eb6cc..d7c83938dfd3d 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h

@@ -533,6 +533,7 @@ extern bool kexec_file_dbg_print;
 
 extern void *kimage_map_segment(struct kimage *image, int idx);
 extern void kimage_unmap_segment(void *buffer);
+extern void kexec_free_segment_cma(struct kimage *image, unsigned long idx);