[PATCH v2] crash_core: export vmemmap when CONFIG_SPARSEMEM_VMEMMAP is enabled

[Huang Shijie]

In memory_model.h, if CONFIG_SPARSEMEM_VMEMMAP is configed,
kernel will use vmemmap to do the __pfn_to_page/page_to_pfn,
and kernel will not use the "classic sparse" to do the
__pfn_to_page/page_to_pfn.

So export the vmemmap when CONFIG_SPARSEMEM_VMEMMAP is configed.
This makes the user applications (crash, etc) get faster
pfn_to_page/page_to_pfn operations too.

Acked-by: Baoquan He <bhe at redhat.com>
Signed-off-by: Huang Shijie <shijie at os.amperecomputing.com>
---
v1 --> v2:
	   rebased to linux-next tree.
Resend   : https://lkml.org/lkml/2024/2/26/98
The v1   : https://lkml.org/lkml/2023/11/26/342	
		
---
 kernel/vmcore_info.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/vmcore_info.c b/kernel/vmcore_info.c
index 8f77e238a54f..f95516cd45bb 100644
--- a/kernel/vmcore_info.c
+++ b/kernel/vmcore_info.c
@@ -152,6 +152,9 @@ static int __init crash_save_vmcoreinfo_init(void)
 	VMCOREINFO_SYMBOL(mem_map);
 	VMCOREINFO_SYMBOL(contig_page_data);
 #endif
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+	VMCOREINFO_SYMBOL_ARRAY(vmemmap);
+#endif
 #ifdef CONFIG_SPARSEMEM
 	VMCOREINFO_SYMBOL_ARRAY(mem_section);
 	VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
-- 
2.40.1