The patch titled
Subject: arm64: kdump: no need to mark crashkernel pages manually PG_reserved
has been added to the -mm tree. Its filename is
arm64-kdump-no-need-to-mark-crashkernel-pages-manually-pg_reserved.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/arm64-kdump-no-need-to-mark-crashkernel-pages-manually-pg_reserved.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/arm64-kdump-no-need-to-mark-crashkernel-pages-manually-pg_reserved.patch
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------------------------------------------------------
From: David Hildenbrand <david@xxxxxxxxxx>
Subject: arm64: kdump: no need to mark crashkernel pages manually PG_reserved
The crashkernel is reserved via memblock_reserve(). memblock_free_all()
will call free_low_memory_core_early(), which will go over all reserved
memblocks, marking the pages as PG_reserved.
So manually marking pages as PG_reserved is not necessary, they are
already in the desired state (otherwise they would have been handed over
to the buddy as free pages and bad things would happen).
Link: http://lkml.kernel.org/r/20190114125903.24845-8-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Matthias Brugger <mbrugger@xxxxxxxx>
Reviewed-by: Bhupesh Sharma <bhsharma@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: James Morse <james.morse@xxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Florian Fainelli <f.fainelli@xxxxxxxxx>
Cc: Stefan Agner <stefan@xxxxxxxx>
Cc: Laura Abbott <labbott@xxxxxxxxxx>
Cc: Greg Hackmann <ghackmann@xxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Kristina Martsenko <kristina.martsenko@xxxxxxx>
Cc: CHANDAN VN <chandan.vn@xxxxxxxxxxx>
Cc: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
Cc: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/machine_kexec.c | 2 +-
arch/arm64/mm/init.c | 27 ---------------------------
2 files changed, 1 insertion(+), 28 deletions(-)
--- a/arch/arm64/kernel/machine_kexec.c~arm64-kdump-no-need-to-mark-crashkernel-pages-manually-pg_reserved
+++ a/arch/arm64/kernel/machine_kexec.c
@@ -321,7 +321,7 @@ void crash_post_resume(void)
* but does not hold any data of loaded kernel image.
*
* Note that all the pages in crash dump kernel memory have been initially
- * marked as Reserved in kexec_reserve_crashkres_pages().
+ * marked as Reserved as memory was allocated via memblock_reserve().
*
* In hibernation, the pages which are Reserved and yet "nosave" are excluded
* from the hibernation iamge. crash_is_nosave() does thich check for crash
--- a/arch/arm64/mm/init.c~arm64-kdump-no-need-to-mark-crashkernel-pages-manually-pg_reserved
+++ a/arch/arm64/mm/init.c
@@ -118,35 +118,10 @@ static void __init reserve_crashkernel(v
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
}
-
-static void __init kexec_reserve_crashkres_pages(void)
-{
-#ifdef CONFIG_HIBERNATION
- phys_addr_t addr;
- struct page *page;
-
- if (!crashk_res.end)
- return;
-
- /*
- * To reduce the size of hibernation image, all the pages are
- * marked as Reserved initially.
- */
- for (addr = crashk_res.start; addr < (crashk_res.end + 1);
- addr += PAGE_SIZE) {
- page = phys_to_page(addr);
- SetPageReserved(page);
- }
-#endif
-}
#else
static void __init reserve_crashkernel(void)
{
}
-
-static void __init kexec_reserve_crashkres_pages(void)
-{
-}
#endif /* CONFIG_KEXEC_CORE */
#ifdef CONFIG_CRASH_DUMP
@@ -586,8 +561,6 @@ void __init mem_init(void)
/* this will put all unused low memory onto the freelists */
memblock_free_all();
- kexec_reserve_crashkres_pages();
-
mem_init_print_info(NULL);
/*
_
Patches currently in -mm which might be from david@xxxxxxxxxx are
mm-balloon-update-comment-about-isolation-migration-compaction.patch
mm-convert-pg_balloon-to-pg_offline.patch
kexec-export-pg_offline-to-vmcoreinfo.patch
xen-balloon-mark-inflated-pages-pg_offline.patch
hv_balloon-mark-inflated-pages-pg_offline.patch
vmw_balloon-mark-inflated-pages-pg_offline.patch
vmw_balloon-mark-inflated-pages-pg_offline-v2.patch
pm-hibernate-use-pfn_to_online_page.patch
pm-hibernate-exclude-all-pageoffline-pages.patch
pm-hibernate-exclude-all-pageoffline-pages-v2.patch
agp-efficeon-no-need-to-set-pg_reserved-on-gatt-tables.patch
s390-vdso-dont-clear-pg_reserved.patch
powerpc-vdso-dont-clear-pg_reserved.patch
riscv-vdso-dont-clear-pg_reserved.patch
m68k-mm-use-__clearpagereserved.patch
arm64-kexec-no-need-to-clearpagereserved.patch
arm64-kdump-no-need-to-mark-crashkernel-pages-manually-pg_reserved.patch
ia64-perfmon-dont-mark-buffer-pages-as-pg_reserved.patch
mm-better-document-pg_reserved.patch
