Re: [PATCH v6 02/14] kexec: Record allocated CMA pages to fix release size mismatch

The CMA pages allocated for a kexec segment are released using the
segment's memsz to calculate the number of pages. However, some
architecture loaders modify the segment's memsz after allocation
(e.g. arm64 subtracts text_offset), causing the release function to
free fewer pages than were originally allocated, leaking the remaining
CMA pages.

Add a per-segment `segment_cma_pages` array to store the number of
pages actually allocated from CMA. Populate it during
kexec_add_buffer() using the aligned memsz, and use it in
kimage_free_cma() to accurately release all allocated pages.

This avoids relying on the potentially modified segment->memsz and
prevents silent CMA memory leaks.

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>
Cc: Brian Mak <redacted>
Cc: Pingfan Liu <redacted>
Cc: Sourabh Jain <redacted>
Cc: Justinien Bouron <redacted>
Cc: Li Chen <redacted>
Cc: Breno Leitao <leitao@debian.org>
Cc: stable@vger.kernel.org
Link: https://sashiko.dev/#/patchset/20260729031235.2840255-1-ruanjinjie%40huawei.com
Fixes: 07d24902977e ("kexec: enable CMA based contiguous allocation")
Signed-off-by: Jinjie Ruan <redacted>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260921090450.807575-1-ruanjinjie@huawei.com?part=2