On Mon, Aug 31, 2020 at 05:23:25PM -0700, Nick Desaulniers wrote:
> From: Marco Elver
>
> Since the kernel now requires at least Clang 10.0.1, remove any mention
> of old Clang versions and simplify the documentation.
>
> Reviewed-by: Andrey Konovalov
> Signed-off-by: Marco Elver
> Signed-off-by: Nick Desaulniers
Reviewed-by: Nathan Chancellor
> ---
> Documentation/dev-tools/kasan.rst | 4 ++--
> lib/Kconfig.kasan | 9 -
> 2 files changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/Documentation/dev-tools/kasan.rst
> b/Documentation/dev-tools/kasan.rst
> index 38fd5681fade..4abc84b1798c 100644
> --- a/Documentation/dev-tools/kasan.rst
> +++ b/Documentation/dev-tools/kasan.rst
> @@ -13,10 +13,10 @@ KASAN uses compile-time instrumentation to insert
> validity checks before every
> memory access, and therefore requires a compiler version that supports that.
>
> Generic KASAN is supported in both GCC and Clang. With GCC it requires
> version
> -8.3.0 or later. With Clang it requires version 7.0.0 or later, but detection
> of
> +8.3.0 or later. Any supported Clang version is compatible, but detection of
> out-of-bounds accesses for global variables is only supported since Clang 11.
>
> -Tag-based KASAN is only supported in Clang and requires version 7.0.0 or
> later.
> +Tag-based KASAN is only supported in Clang.
>
> Currently generic KASAN is supported for the x86_64, arm64, xtensa, s390 and
> riscv architectures, and tag-based KASAN is supported only for arm64.
> diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
> index 047b53dbfd58..033a5bc67ac4 100644
> --- a/lib/Kconfig.kasan
> +++ b/lib/Kconfig.kasan
> @@ -54,9 +54,9 @@ config KASAN_GENERIC
> Enables generic KASAN mode.
>
> This mode is supported in both GCC and Clang. With GCC it requires
> - version 8.3.0 or later. With Clang it requires version 7.0.0 or
> - later, but detection of out-of-bounds accesses for global variables
> - is supported only since Clang 11.
> + version 8.3.0 or later. Any supported Clang version is compatible,
> + but detection of out-of-bounds accesses for global variables is
> + supported only since Clang 11.
>
> This mode consumes about 1/8th of available memory at kernel start
> and introduces an overhead of ~x1.5 for the rest of the allocations.
> @@ -78,8 +78,7 @@ config KASAN_SW_TAGS
> Enables software tag-based KASAN mode.
>
> This mode requires Top Byte Ignore support by the CPU and therefore
> - is only supported for arm64. This mode requires Clang version 7.0.0
> - or later.
> + is only supported for arm64. This mode requires Clang.
>
> This mode consumes about 1/16th of available memory at kernel start
> and introduces an overhead of ~20% for the rest of the allocations.
> --
> 2.28.0.402.g5ffc5be6b7-goog
>
