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| author | James Morse <james.morse@arm.com> | 2016-08-24 20:27:30 +0300 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2016-08-25 20:00:30 +0300 |
| commit | 5ebe3a44cc744d11cb60d8438106a9322b7c04dc (patch) | |
| tree | 24cc917fb9078acdc2b1deee131c4744d625cf1e /arch/arm64/Kconfig | |
| parent | b61130381120398876b86282082ad9f24976dfcf (diff) | |
| download | linux-5ebe3a44cc744d11cb60d8438106a9322b7c04dc.tar.xz | |
arm64: hibernate: Support DEBUG_PAGEALLOC
DEBUG_PAGEALLOC removes the valid bit of page table entries to prevent
any access to unallocated memory. Hibernate uses this as a hint that those
pages don't need to be saved/restored. This patch adds the
kernel_page_present() function it uses.
hibernate.c copies the resume kernel's linear map for use during restore.
Add _copy_pte() to fill-in the holes made by DEBUG_PAGEALLOC in the resume
kernel, so we can restore data the original kernel had at these addresses.
Finally, DEBUG_PAGEALLOC means the linear-map alias of KERNEL_START to
KERNEL_END may have holes in it, so we can't lazily clean this whole
area to the PoC. Only clean the new mmuoff region, and the kernel/kvm
idmaps.
This reverts commit da24eb1f3f9e2c7b75c5f8c40d8e48e2c4789596.
Reported-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index bc3f00f586f1..9be0c164df4e 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -607,7 +607,6 @@ source kernel/Kconfig.preempt source kernel/Kconfig.hz config ARCH_SUPPORTS_DEBUG_PAGEALLOC - depends on !HIBERNATION def_bool y config ARCH_HAS_HOLES_MEMORYMODEL |