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

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Message-Id: <be07403806abc56ec027f6d47468411876e18bb5.1560267983.git.christophe.leroy@c-s.fr>
Date:   Tue, 11 Jun 2019 15:47:20 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, erhard_f@...lbox.org
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] powerpc/32s: fix initial setup of segment registers on
 secondary CPU

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@...lbox.org>
Fixes: 215b823707ce ("powerpc/32s: set up an early static hash table for KASAN")
Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/kernel/head_32.S | 1 +
 1 file changed, 1 insertion(+)

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 */
-- 
2.13.3