[PATCH v6 13/13] riscv: Add qspinlock support

[Conor Dooley]

On Sun, Nov 03, 2024 at 03:51:53PM +0100, Alexandre Ghiti wrote:
> In order to produce a generic kernel, a user can select
> CONFIG_COMBO_SPINLOCKS which will fallback at runtime to the ticket
> spinlock implementation if Zabha or Ziccrse are not present.
> 
> Note that we can't use alternatives here because the discovery of
> extensions is done too late and we need to start with the qspinlock
> implementation because the ticket spinlock implementation would pollute
> the spinlock value, so let's use static keys.
> 
> This is largely based on Guo's work and Leonardo reviews at [1].
> 
> Link: https://lore.kernel.org/linux-riscv/20231225125847.2778638-1-guoren@kernel.org/ [1]
> Signed-off-by: Guo Ren <guoren at kernel.org>
> Signed-off-by: Alexandre Ghiti <alexghiti at rivosinc.com>

This patch (now commit ab83647fadae2 ("riscv: Add qspinlock support"))
breaks boot on polarfire soc. It dies before outputting anything to the
console. My .config has:

# CONFIG_RISCV_TICKET_SPINLOCKS is not set
# CONFIG_RISCV_QUEUED_SPINLOCKS is not set
CONFIG_RISCV_COMBO_SPINLOCKS=y
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