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authorHuang Shijie <shijie@os.amperecomputing.com>2024-02-27 09:49:52 +0800
committerAndrew Morton <akpm@linux-foundation.org>2024-03-04 17:01:27 -0800
commitd3246b6ee42a155ab57e936841028fff3d7d98b4 (patch)
tree16808a2e60754beaeff72b5a42558aa8b5f8ae80 /kernel/vmcore_info.c
parent8f8cd6c0a43ed637e620bbe45a8d0e0c2f4d5130 (diff)
crash_core: export vmemmap when CONFIG_SPARSEMEM_VMEMMAP is enabled
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. Link: https://lkml.kernel.org/r/20240227014952.3184-1-shijie@os.amperecomputing.com Signed-off-by: Huang Shijie <shijie@os.amperecomputing.com> Acked-by: Baoquan He <bhe@redhat.com> Cc: Dave Young <dyoung@redhat.com> Cc: Kazuhito Hagio <k-hagio-ab@nec.com> Cc: Lianbo Jiang <lijiang@redhat.com> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'kernel/vmcore_info.c')
-rw-r--r--kernel/vmcore_info.c3
1 files changed, 3 insertions, 0 deletions
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);