[PATCH v2] riscv: enable HAVE_ARCH_STACKLEAK

[patchwork-bot+linux-riscv at kernel.org]

Hello:

This patch was applied to riscv/linux.git (for-next)
by Palmer Dabbelt <palmer at rivosinc.com>:

On Mon, 24 Jun 2024 07:53:16 +0800 you wrote:
> Add support for the stackleak feature. Whenever the kernel returns to user
> space the kernel stack is filled with a poison value.
> 
> At the same time, disables the plugin in EFI stub code because EFI stub
> is out of scope for the protection.
> 
> Tested on qemu and milkv duo:
> / # echo STACKLEAK_ERASING > /sys/kernel/debug/provoke-crash/DIRECT
> [   38.675575] lkdtm: Performing direct entry STACKLEAK_ERASING
> [   38.678448] lkdtm: stackleak stack usage:
> [   38.678448]   high offset: 288 bytes
> [   38.678448]   current:     496 bytes
> [   38.678448]   lowest:      1328 bytes
> [   38.678448]   tracked:     1328 bytes
> [   38.678448]   untracked:   448 bytes
> [   38.678448]   poisoned:    14312 bytes
> [   38.678448]   low offset:  8 bytes
> [   38.689887] lkdtm: OK: the rest of the thread stack is properly erased
> 
> [...]

Here is the summary with links:
  - [v2] riscv: enable HAVE_ARCH_STACKLEAK
    https://git.kernel.org/riscv/c/0059748ce289

You are awesome, thank you!
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