Re: [PATCH] powerpc/32s: fix initial setup of segment registers on secondary CPU

From: Christophe Leroy
Date: Tue Jun 18 2019 - 08:49:06 EST

Le 18/06/2019 Ã 14:31, Michael Ellerman a ÃcritÂ:
Christophe Leroy <christophe.leroy@xxxxxx> writes:
Le 11/06/2019 Ã 17:47, Christophe Leroy a ÃcritÂ:
The patch referenced below moved the loading of segment registers
out of load_up_mmu() in order to do it earlier in the boot sequence.
However, the secondary CPU still needs it to be done when loading up
the MMU.

Reported-by: Erhard F. <erhard_f@xxxxxxxxxxx>
Fixes: 215b823707ce ("powerpc/32s: set up an early static hash table for KASAN")

Cc: stable@xxxxxxxxxxxxxxx

Sorry patchwork didn't pick that up and I missed it. The AUTOSEL bot
will probably pick it up anyway though.

Don't worry, this was unneeded because we added KASAN in 5.2.
My mistake.


diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index 1d5f1bd0dacd..f255e22184b4 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -752,6 +752,7 @@ __secondary_start:
stw r0,0(r3)
/* load up the MMU */
+ bl load_segment_registers
bl load_up_mmu
/* ptr to phys current thread */