linux-kernel - [PATCH] crash_core: export vmemmap when CONFIG_SPARSEMEM

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Date:   Mon, 27 Nov 2023 10:07:27 +0800
From:   Huang Shijie <shijie@...amperecomputing.com>
To:     bhe@...hat.com
Cc:     vgoyal@...hat.com, dyoung@...hat.com, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org, patches@...erecomputing.com,
        Huang Shijie <shijie@...amperecomputing.com>
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.

Signed-off-by: Huang Shijie <shijie@...amperecomputing.com>
---
 kernel/crash_core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index efe87d501c8c..9653c4177191 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -765,6 +765,9 @@ 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