Anshuman Khandual 79cc2ed5a7 arm64/mm: Drop THP conditionality from FORCE_MAX_ZONEORDER ... Currently without THP being enabled, MAX_ORDER via FORCE_MAX_ZONEORDER gets reduced to 11, which falls below HUGETLB_PAGE_ORDER for certain 16K and 64K page size configurations. This is problematic which throws up the following warning during boot as pageblock_order via HUGETLB_PAGE_ORDER order exceeds MAX_ORDER. WARNING: CPU: 7 PID: 127 at mm/vmstat.c:1092 __fragmentation_index+0x58/0x70 Modules linked in: CPU: 7 PID: 127 Comm: kswapd0 Not tainted 5.12.0-rc1-00005-g0221e3101a1 #237 Hardware name: linux,dummy-virt (DT) pstate: 20400005 (nzCv daif +PAN -UAO -TCO BTYPE=--) pc : __fragmentation_index+0x58/0x70 lr : fragmentation_index+0x88/0xa8 sp : ffff800016ccfc00 x29: ffff800016ccfc00 x28: 0000000000000000 x27: ffff800011fd4000 x26: 0000000000000002 x25: ffff800016ccfda0 x24: 0000000000000002 x23: 0000000000000640 x22: ffff0005ffcb5b18 x21: 0000000000000002 x20: 000000000000000d x19: ffff0005ffcb3980 x18: 0000000000000004 x17: 0000000000000001 x16: 0000000000000019 x15: ffff800011ca7fb8 x14: 00000000000002b3 x13: 0000000000000000 x12: 00000000000005e0 x11: 0000000000000003 x10: 0000000000000080 x9 : ffff800011c93948 x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000007000 x5 : 0000000000007944 x4 : 0000000000000032 x3 : 000000000000001c x2 : 000000000000000b x1 : ffff800016ccfc10 x0 : 000000000000000d Call trace: __fragmentation_index+0x58/0x70 compaction_suitable+0x58/0x78 wakeup_kcompactd+0x8c/0xd8 balance_pgdat+0x570/0x5d0 kswapd+0x1e0/0x388 kthread+0x154/0x158 ret_from_fork+0x10/0x30 This solves the problem via keeping FORCE_MAX_ZONEORDER unchanged with or without THP on 16K and 64K page size configurations, making sure that the HUGETLB_PAGE_ORDER (and pageblock_order) would never exceed MAX_ORDER. Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/1614597914-28565-1-git-send-email-anshuman.khandual@arm.com Signed-off-by: Will Deacon <will@kernel.org>		2021-03-08 13:03:54 +00:00
..
boot	regulator: Updates for v5.12	2021-02-22 09:16:38 -08:00
configs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid	2021-02-23 14:52:22 -08:00
crypto	crypto: arm64/crc-t10dif - move NEON yield to C code	2021-02-10 17:55:58 +11:00
include	RISC-V Patches for the 5.12 Merge Window	2021-02-26 10:28:35 -08:00
kernel	arm64: Drop support for CMDLINE_EXTEND	2021-03-08 12:56:34 +00:00
kvm	arm64 fixes for -rc1	2021-02-26 10:19:03 -08:00
lib	arm64: kasan: simplify and inline MTE functions	2021-02-26 09:41:03 -08:00
mm	RISC-V Patches for the 5.12 Merge Window	2021-02-26 10:28:35 -08:00
net	bpf: Rename BPF_XADD and prepare to encode other atomics in .imm	2021-01-14 18:34:29 -08:00
xen
Kbuild
Kconfig	arm64/mm: Drop THP conditionality from FORCE_MAX_ZONEORDER	2021-03-08 13:03:54 +00:00
Kconfig.debug	arm64: remove TEXT_OFFSET randomization	2020-06-15 13:10:59 +01:00
Kconfig.platforms	Updates for the irq subsystem:	2021-02-21 11:53:06 -08:00
Makefile	arm64: do not descend to vdso directories twice	2021-01-20 12:18:46 +00:00