[PATCH -fixes] riscv: patch: Flush the icache right after patching to avoid illegal insns

[Conor Dooley]

On Mon, Jun 24, 2024 at 10:21:41AM +0200, Alexandre Ghiti wrote:
> We cannot delay the icache flush after patching some functions as we may
> have patched a function that will get called before the icache flush.
> 
> The only way to completely avoid such scenario is by flushing the icache
> as soon as we patch a function. This will probably be costly as we don't
> batch the icache maintenance anymore.
> 
> Fixes: 6ca445d8af0e ("riscv: Fix early ftrace nop patching")
> Reported-by: Conor Dooley <conor.dooley at microchip.com>
> Closes: https://lore.kernel.org/linux-riscv/20240613-lubricant-breath-061192a9489a@wendy/
> Signed-off-by: Alexandre Ghiti <alexghiti at rivosinc.com>

So, I can't even test this right now :/ The issue is annoying enough to
reproduce that same config + compiler + commit isn't enough.
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