[PATCH -next V14 4/7] riscv: entry: Convert to generic entry

[Conor Dooley]

Hey Guo Ren,

On Thu, Jan 12, 2023 at 04:58:45AM -0500, guoren at kernel.org wrote:
> From: Guo Ren <guoren at linux.alibaba.com>
> 
> This patch converts riscv to use the generic entry infrastructure from
> kernel/entry/*. The generic entry makes maintainers' work easier and
> codes more elegant. Here are the changes:
> 
>  - More clear entry.S with handle_exception and ret_from_exception
>  - Get rid of complex custom signal implementation
>  - Move syscall procedure from assembly to C, which is much more
>    readable.
>  - Connect ret_from_fork & ret_from_kernel_thread to generic entry.
>  - Wrap with irqentry_enter/exit and syscall_enter/exit_from_user_mode
>  - Use the standard preemption code instead of custom
> 
> Suggested-by: Huacai Chen <chenhuacai at kernel.org>
> Reviewed-by: Björn Töpel <bjorn at rivosinc.com>
> Tested-by: Yipeng Zou <zouyipeng at huawei.com>
> Tested-by: Jisheng Zhang <jszhang at kernel.org>
> Signed-off-by: Guo Ren <guoren at linux.alibaba.com>
> Signed-off-by: Guo Ren <guoren at kernel.org>
> Cc: Ben Hutchings <ben at decadent.org.uk>

Unfortunately from this patch onwards, the !MMU build is broken.
Should be able to reproduce it with nommu_virt_defconfig.

Thanks,
Conor.

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