[PATCH v1 7/9] arm64: kdump: No need to mark crashkernel pages manually PG_reserved
From: David Hildenbrand <hidden>
Date: 2018-12-14 11:11:15
Also in:
linux-mediatek, linux-mm, linux-riscv, linux-s390, linuxppc-dev, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
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). Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <redacted> Cc: James Morse <james.morse@arm.com> Cc: Bhupesh Sharma <redacted> Cc: David Hildenbrand <redacted> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Dave Kleikamp <redacted> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Mike Rapoport <redacted> Cc: Michal Hocko <mhocko@suse.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Stefan Agner <stefan@agner.ch> Cc: Laura Abbott <redacted> Cc: Greg Hackmann <redacted> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Kristina Martsenko <redacted> Cc: CHANDAN VN <redacted> Cc: AKASHI Takahiro <redacted> Cc: Logan Gunthorpe <logang@deltatee.com> Signed-off-by: David Hildenbrand <redacted> --- arch/arm64/kernel/machine_kexec.c | 2 +- arch/arm64/mm/init.c | 27 --------------------------- 2 files changed, 1 insertion(+), 28 deletions(-)
diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c
index 6f0587b5e941..66b5d697d943 100644
--- a/arch/arm64/kernel/machine_kexec.c
+++ b/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
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index a8f2e4792ef9..9dcfa809b7ab 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c@@ -118,35 +118,10 @@ static void __init reserve_crashkernel(void) 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); /*
--
2.17.2
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