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UPSTREAM: arm64: Kconfig: select KASAN_VMALLOC if KANSAN_GENERIC is enabled

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Before this patch, someone who wants to use VMAP_STACK when
KASAN_GENERIC enabled must explicitly select KASAN_VMALLOC.

>From Will's suggestion [1]:
  > I would _really_ like to move to VMAP stack unconditionally, and
  > that would effectively force KASAN_VMALLOC to be set if KASAN is in use

Because VMAP_STACK now depends on either HW_TAGS or KASAN_VMALLOC if
KASAN enabled, in order to make VMAP_STACK selected unconditionally,
we bind KANSAN_GENERIC and KASAN_VMALLOC together.

Note that SW_TAGS supports neither VMAP_STACK nor KASAN_VMALLOC now,
so this is the first step to make VMAP_STACK selected unconditionally.

Bind KANSAN_GENERIC and KASAN_VMALLOC together is supposed to cost more
memory at runtime, thus the alternative is using SW_TAGS KASAN instead.

[1]: https://lore.kernel.org/lkml/20210204150100.GE20815@willie-the-truck/

Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Lecopzer Chen <lecopzer.chen@mediatek.com>
Link: https://lore.kernel.org/r/20210324040522.15548-6-lecopzer.chen@mediatek.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Bug: 201711661
(cherry picked from commit acc3042d62)
Signed-off-by: Yee Lee <yee.lee@mediatek.com>
Change-Id: Ic7884e3acafa02361c8a250028ceebdb1780a49e
This commit is contained in:
Lecopzer Chen
2021-03-24 12:05:22 +08:00
committed by Suren Baghdasaryan
parent 23232f84c8
commit 2659f14d93
1 changed files with 1 additions and 0 deletions
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arch/arm64/Kconfig
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@@ -195,6 +195,7 @@ config ARM64
select IOMMU_DMA if IOMMU_SUPPORT
select IRQ_DOMAIN
select IRQ_FORCED_THREADING
select KASAN_VMALLOC if KASAN_GENERIC
select MODULES_USE_ELF_RELA
select NEED_DMA_MAP_STATE
select NEED_SG_DMA_LENGTH