[PATCH v9 8/8] crash_core: skip MEMBLOCK_NODUMP regions when building vmcore ELF header

[Wandun Chen]

From: Wandun Chen <chenwandun at lixiang.com>

Reserve regions (for GPU, DSP, ...) carry no data useful for crash
analysis. Exclude MEMBLOCK_NODUMP regions from the vmcore ELF header to
reduce vmcore size and capture time. crash_should_skip_region() now also
returns true for MEMBLOCK_NODUMP.

Signed-off-by: Wandun Chen <chenwandun at lixiang.com>
Tested-by: Meijing Zhao <zhaomeijing at lixiang.com>
Acked-by: Baoquan He <baoquan.he at linux.dev>
---
 kernel/crash_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index e161c8b65e00..0e2ddc933b22 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -283,10 +283,10 @@ static struct crash_mem *alloc_cmem(unsigned int nr_ranges)
 }
 
 #ifdef CONFIG_ARCH_KEEP_MEMBLOCK
-/* Exclude NOMAP regions from the vmcore. */
+/* Exclude NOMAP and NODUMP regions from the vmcore. */
 static bool crash_should_skip_region(struct memblock_region *reg)
 {
-	return memblock_is_nomap(reg);
+	return memblock_is_nomap(reg) || memblock_is_nodump(reg);
 }
 
 unsigned int __weak arch_get_system_nr_ranges(void)
-- 
2.43.0