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linux/arch/arm64
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Ard Biesheuvel 97142f3009 arm64: account for sparsemem section alignment when choosing vmemmap offset 
commit 36e5cd6b89 upstream.

Commit dfd55ad85e ("arm64: vmemmap: use virtual projection of linear
region") fixed an issue where the struct page array would overflow into the
adjacent virtual memory region if system RAM was placed so high up in
physical memory that its addresses were not representable in the build time
configured virtual address size.

However, the fix failed to take into account that the vmemmap region needs
to be relatively aligned with respect to the sparsemem section size, so that
a sequence of page structs corresponding with a sparsemem section in the
linear region appears naturally aligned in the vmemmap region.

So round up vmemmap to sparsemem section size. Since this essentially moves
the projection of the linear region up in memory, also revert the reduction
of the size of the vmemmap region.

Fixes: dfd55ad85e ("arm64: vmemmap: use virtual projection of linear region")
Tested-by: Mark Langsdorf <mlangsdo@redhat.com>
Tested-by: David Daney <david.daney@cavium.com>
Tested-by: Robert Richter <rrichter@cavium.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2016-03-16 08:42:57 -07:00
..
boot ls2080a/dts: Add little endian property for GPIO IP block 2015-12-11 16:13:03 -08:00
configs arm64 fixes and clean-ups: 2015-11-12 15:33:11 -08:00
crypto arm64: crypto: reduce priority of core AES cipher 2015-11-18 12:09:08 +00:00
include arm64: account for sparsemem section alignment when choosing vmemmap offset 2016-03-16 08:42:57 -07:00
kernel arm64: kernel: fix architected PMU registers unconditional access 2016-01-31 11:29:04 -08:00
kvm arm/arm64: KVM: Fix ioctl error handling 2016-03-09 15:34:51 -08:00
lib arm64: add KASAN support 2015-10-12 17:46:36 +01:00
mm arm64: vmemmap: use virtual projection of linear region 2016-03-09 15:34:52 -08:00
net arm64: bpf: add 'store immediate' instruction 2015-12-03 11:38:31 -05:00
xen arm: xen: implement multicall hypercall support. 2014-04-24 13:09:46 +01:00
Kconfig arm64 fixes: 2015-11-27 11:09:59 -08:00
Kconfig.debug arm64: remove redundant FRAME_POINTER kconfig option and force to select it 2015-11-10 10:36:00 +00:00
Kconfig.platforms ARM: DT updates for v4.4 2015-11-10 15:06:26 -08:00
Makefile arm64: errata: Add -mpc-relative-literal-loads to build flags 2016-03-03 15:07:08 -08:00