linux-kernel - [PATCH] powerpc/Kconfig: Force THREAD

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Date:   Mon, 30 May 2022 18:01:53 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Erhard Furtner <erhard_f@...lbox.org>
Subject: [PATCH] powerpc/Kconfig: Force THREAD_SHIFT to at least 14 with KASAN

Allthough 14 is the default THREAD_SHIFT when KASAN is selected,
taking an old config may keep 13 when CONFIG_EXPERT is selected.

Force it to 14 as a minimum when KASAN is selected.

Also default to 15 when KASAN on PPC64.

Reported-by: Erhard Furtner <erhard_f@...lbox.org>
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/Kconfig | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 3eaddb8997a9..a4427977fdf8 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -788,8 +788,10 @@ config PPC_PAGE_SHIFT
 
 config THREAD_SHIFT
 	int "Thread shift" if EXPERT
-	range 13 15
+	range 13 15 if !KASAN
+	range 14 15 if KASAN
 	default "15" if PPC_256K_PAGES
+	default "15" if PPC64 && KASAN
 	default "14" if PPC64
 	default "14" if KASAN
 	default "13"
-- 
2.35.3