From d3246b6ee42a155ab57e936841028fff3d7d98b4 Mon Sep 17 00:00:00 2001 From: Huang Shijie <shijie@os.amperecomputing.com> Date: Tue, 27 Feb 2024 09:49:52 +0800 Subject: [PATCH] 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> --- kernel/vmcore_info.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/vmcore_info.c b/kernel/vmcore_info.c index 8f77e238a54f5..f95516cd45bbe 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); -- GitLab