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@xxxxxxxxxx> Signed-off-by: Huang Shijie <shijie@xxxxxxxxxxxxxxxxxxxxxx> --- The old patch: https://lkml.org/lkml/2023/11/26/342 --- kernel/crash_core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/crash_core.c b/kernel/crash_core.c index d48315667752..d665ddc66fec 100644 --- a/kernel/crash_core.c +++ b/kernel/crash_core.c @@ -744,6 +744,9 @@ 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 _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
