The patch titled
Subject: crash_core: export vmemmap when CONFIG_SPARSEMEM_VMEMMAP is enabled
has been added to the -mm mm-nonmm-unstable branch. Its filename is
crash_core-export-vmemmap-when-config_sparsemem_vmemmap-is-enabled.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/crash_core-export-vmemmap-when-config_sparsemem_vmemmap-is-enabled.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Huang Shijie <shijie@xxxxxxxxxxxxxxxxxxxxxx>
Subject: crash_core: export vmemmap when CONFIG_SPARSEMEM_VMEMMAP is enabled
Date: Tue, 27 Feb 2024 09:49:52 +0800
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@xxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Huang Shijie <shijie@xxxxxxxxxxxxxxxxxxxxxx>
Acked-by: Baoquan He <bhe@xxxxxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: Kazuhito Hagio <k-hagio-ab@xxxxxxx>
Cc: Lianbo Jiang <lijiang@xxxxxxxxxx>
Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/vmcore_info.c | 3 +++
1 file changed, 3 insertions(+)
--- a/kernel/vmcore_info.c~crash_core-export-vmemmap-when-config_sparsemem_vmemmap-is-enabled
+++ a/kernel/vmcore_info.c
@@ -152,6 +152,9 @@ static int __init crash_save_vmcoreinfo_
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);
_
Patches currently in -mm which might be from shijie@xxxxxxxxxxxxxxxxxxxxxx are
crash_core-export-vmemmap-when-config_sparsemem_vmemmap-is-enabled.patch
