linux-kernel - [PATCH v5 10/22] powerpc/syscall: Use is_compat

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Message-Id: <c8094662199337a7200fea9f6e1d1f8b1b6d5f69.1612796617.git.christophe.leroy@csgroup.eu>
Date:   Mon,  8 Feb 2021 15:10:29 +0000 (UTC)
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>, npiggin@...il.com,
        msuchanek@...e.de
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v5 10/22] powerpc/syscall: Use is_compat_task()

Instead of hard comparing task flags with _TIF_32BIT, use
is_compat_task(). The advantage is that it returns 0 on PPC32
allthough _TIF_32BIT is always set.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/kernel/interrupt.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
index 2dac4d2bb1cf..46fd195ca659 100644
--- a/arch/powerpc/kernel/interrupt.c
+++ b/arch/powerpc/kernel/interrupt.c
@@ -2,6 +2,8 @@
 
 #include <linux/context_tracking.h>
 #include <linux/err.h>
+#include <linux/compat.h>
+
 #include <asm/asm-prototypes.h>
 #include <asm/kup.h>
 #include <asm/cputime.h>
@@ -118,7 +120,7 @@ notrace long system_call_exception(long r3, long r4, long r5,
 	/* May be faster to do array_index_nospec? */
 	barrier_nospec();
 
-	if (unlikely(is_32bit_task())) {
+	if (unlikely(is_compat_task())) {
 		f = (void *)compat_sys_call_table[r0];
 
 		r3 &= 0x00000000ffffffffULL;
-- 
2.25.0