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powerpc/64s: Make flush_and_reload_slb a no-op when radix is enabled 

The radix test can exclude slb_flush_all_realmode() from being called
because flush_and_reload_slb() is only expected to flush ERAT when
called by flush_erat(), which is only on pre-ISA v3.0 CPUs that do not
support radix.

This helps the later change to make hash support configurable to not
introduce runtime changes to radix mode behaviour.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211201144153.2456614-9-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2021-12-02 00:41:43 +10:00 committed by Michael Ellerman
parent 162b0889bb
commit 310dce6201
1 changed files with 3 additions and 3 deletions
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6
arch/powerpc/kernel/mce_power.c
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@ -80,12 +80,12 @@ static bool mce_in_guest(void)
#ifdef CONFIG_PPC_BOOK3S_64
void flush_and_reload_slb(void)
{
/* Invalidate all SLBs */
slb_flush_all_realmode();
if (early_radix_enabled())
return;
/* Invalidate all SLBs */
slb_flush_all_realmode();
/*
* This probably shouldn't happen, but it may be possible it's
* called in early boot before SLB shadows are allocated.