linux-kernel - [PATCH 2/4] sparc: bpf_jit: Move four assignments in bpf_jit

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Date:   Sat, 3 Sep 2016 18:38:03 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     sparclinux@...r.kernel.org,
        Adam Buchbinder <adam.buchbinder@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Rabin Vincent <rabin@....in>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 2/4] sparc: bpf_jit: Move four assignments in
 bpf_jit_compile()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sat, 3 Sep 2016 17:45:28 +0200

Move the assignments for four local variables a bit at the beginning
so that they will only be performed if a corresponding memory allocation
succeeded by this function.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 arch/sparc/net/bpf_jit_comp.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/sparc/net/bpf_jit_comp.c b/arch/sparc/net/bpf_jit_comp.c
index ced1393..a927470 100644
--- a/arch/sparc/net/bpf_jit_comp.c
+++ b/arch/sparc/net/bpf_jit_comp.c
@@ -362,10 +362,10 @@ do {	*prog++ = BR_OPC | WDISP22(OFF);		\
 
 void bpf_jit_compile(struct bpf_prog *fp)
 {
-	unsigned int cleanup_addr, proglen, oldproglen = 0;
-	u32 temp[8], *prog, *func, seen = 0, pass;
-	const struct sock_filter *filter = fp->insns;
-	int i, flen = fp->len, pc_ret0 = -1;
+	unsigned int cleanup_addr, proglen, oldproglen;
+	u32 temp[8], *prog, *func, seen, pass;
+	const struct sock_filter *filter;
+	int i, flen = fp->len, pc_ret0;
 	unsigned int *addrs;
 	void *image;
 
@@ -385,6 +385,10 @@ void bpf_jit_compile(struct bpf_prog *fp)
 	}
 	cleanup_addr = proglen; /* epilogue address */
 	image = NULL;
+	filter = fp->insns;
+	oldproglen = 0;
+	pc_ret0 = -1;
+	seen = 0;
 	for (pass = 0; pass < 10; pass++) {
 		u8 seen_or_pass0 = (pass == 0) ? (SEEN_XREG | SEEN_DATAREF | SEEN_MEM) : seen;
 
-- 
2.9.3