linux-kernel - [PATCH 3/3] powerpc/inst: Define ppc_inst

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Message-Id: <59d0b6305ce3c9eb0598ad1997111e5f3f57f2bd.1631903846.git.christophe.leroy@csgroup.eu>
Date:   Fri, 17 Sep 2021 20:37:40 +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
Subject: [PATCH 3/3] powerpc/inst: Define ppc_inst_t as u32 on PPC32

Unlike PPC64 ABI, PPC32 uses the stack to pass a parameter defined
as a struct, even when the struct has a single simple element.

To avoid that, define ppc_inst_t as u32 on PPC32.

Keep it as 'struct ppc_inst' when __CHECKER__ is defined so that
sparse can perform type checking.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/include/asm/inst.h | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/inst.h b/arch/powerpc/include/asm/inst.h
index c4775f4c93a4..2f8d189e4d76 100644
--- a/arch/powerpc/include/asm/inst.h
+++ b/arch/powerpc/include/asm/inst.h
@@ -41,6 +41,7 @@ struct ppc_inst {
 #endif
 } __packed;
 
+#if defined(CONFIG_PPC64) || defined(__CHECKER__)
 typedef struct ppc_inst ppc_inst_t;
 
 static inline u32 ppc_inst_val(ppc_inst_t x)
@@ -48,13 +49,23 @@ static inline u32 ppc_inst_val(ppc_inst_t x)
 	return x.val;
 }
 
+#define ppc_inst(x) ((ppc_inst_t){ .val = (x) })
+
+#else
+typedef u32 ppc_inst_t;
+
+static inline u32 ppc_inst_val(ppc_inst_t x)
+{
+	return x;
+}
+#define ppc_inst(x) (x)
+#endif
+
 static inline int ppc_inst_primary_opcode(ppc_inst_t x)
 {
 	return ppc_inst_val(x) >> 26;
 }
 
-#define ppc_inst(x) ((ppc_inst_t){ .val = (x) })
-
 #ifdef CONFIG_PPC64
 #define ppc_inst_prefix(x, y) ((ppc_inst_t){ .val = (x), .suffix = (y) })
 
-- 
2.31.1