Re: [PATCH v3] MIPS: Workaround clang inline compat branch issue

[Thomas Bogendoerfer <tsbogend@alpha.franken.de>]

On Tue, Feb 28, 2023 at 07:34:59PM +0000, Jiaxun Yang wrote:
> Clang is unable to handle the situation that a chunk of inline
> assembly ends with a compat branch instruction and then compiler
> generates another control transfer instruction immediately after
> this compat branch. The later instruction will end up in forbidden
> slot and cause exception.
> 
> Workaround by add a option to control the use of compact branch.
> Currently it's selected by CC_IS_CLANG and hopefully we can change
> it to a version check in future if clang manages to fix it.
> 
> Fix boot on boston board.
> 
> Link: https://github.com/llvm/llvm-project/issues/61045
> Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
> Acked-by: Nathan Chancellor <nathan@kernel.org>
> ---
> v2: Add Link tag to LLVM bug
> v3: Docuement issue link in Kconfig as well
> ---
>  arch/mips/Kconfig           | 4 ++++
>  arch/mips/include/asm/asm.h | 2 +-
>  2 files changed, 5 insertions(+), 1 deletion(-)

applied to mips-next.

Thomas.

-- 
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