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    SubjectRe: [PATCH 29/31] kasan, arm64: allow KASAN_VMALLOC with HW_TAGS
    On Tue, Nov 30, 2021 at 11:08PM +0100, andrey.konovalov@linux.dev wrote:
    > From: Andrey Konovalov <andreyknvl@google.com>
    >
    > vmalloc tagging support for HW_TAGS KASAN is now complete.
    >
    > Allow enabling CONFIG_KASAN_VMALLOC.

    This actually doesn't "allow" enabling it, it unconditionally enables it
    and a user can't disable CONFIG_KASAN_VMALLOC.

    I found some background in acc3042d62cb9 why arm64 wants this.

    > Also adjust CONFIG_KASAN_VMALLOC description:
    >
    > - Mention HW_TAGS support.
    > - Remove unneeded internal details: they have no place in Kconfig
    > description and are already explained in the documentation.
    >
    > Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
    > ---
    > arch/arm64/Kconfig | 3 +--
    > lib/Kconfig.kasan | 20 ++++++++++----------
    > 2 files changed, 11 insertions(+), 12 deletions(-)
    >
    > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
    > index c05d7a06276f..5981e5460c51 100644
    > --- a/arch/arm64/Kconfig
    > +++ b/arch/arm64/Kconfig
    > @@ -205,8 +205,7 @@ config ARM64
    > select IOMMU_DMA if IOMMU_SUPPORT
    > select IRQ_DOMAIN
    > select IRQ_FORCED_THREADING
    > - select KASAN_VMALLOC if KASAN_GENERIC
    > - select KASAN_VMALLOC if KASAN_SW_TAGS
    > + select KASAN_VMALLOC

    This produces the following warning when making an arm64 defconfig:

    | WARNING: unmet direct dependencies detected for KASAN_VMALLOC
    | Depends on [n]: KASAN [=n] && HAVE_ARCH_KASAN_VMALLOC [=y]
    | Selected by [y]:
    | - ARM64 [=y]
    |
    | WARNING: unmet direct dependencies detected for KASAN_VMALLOC
    | Depends on [n]: KASAN [=n] && HAVE_ARCH_KASAN_VMALLOC [=y]
    | Selected by [y]:
    | - ARM64 [=y]

    To unconditionally select KASAN_VMALLOC, it should probably be

    select KASAN_VMALLOC if KASAN

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