netdev - [PATCH 1/3] powerpc: bpf: remove redundant check for non-null image

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Message-Id: <e73efe6facf6c06932b4a87707e5978172ee773e.1484326337.git.naveen.n.rao@linux.vnet.ibm.com>
Date:   Fri, 13 Jan 2017 22:40:00 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:     mpe@...erman.id.au
Cc:     linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org, ast@...com,
        daniel@...earbox.net, davem@...emloft.net
Subject: [PATCH 1/3] powerpc: bpf: remove redundant check for non-null image

From: Daniel Borkmann <daniel@...earbox.net>

We have a check earlier to ensure we don't proceed if image is NULL. As
such, the redundant check can be removed.

Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
[Added similar changes for classic BPF JIT]
Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
---
 arch/powerpc/net/bpf_jit_comp.c   | 17 +++++++++--------
 arch/powerpc/net/bpf_jit_comp64.c | 16 ++++++++--------
 2 files changed, 17 insertions(+), 16 deletions(-)

diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index 7e706f3..f9941b3 100644
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -662,16 +662,17 @@ void bpf_jit_compile(struct bpf_prog *fp)
 		 */
 		bpf_jit_dump(flen, proglen, pass, code_base);
 
-	if (image) {
-		bpf_flush_icache(code_base, code_base + (proglen/4));
+	bpf_flush_icache(code_base, code_base + (proglen/4));
+
 #ifdef CONFIG_PPC64
-		/* Function descriptor nastiness: Address + TOC */
-		((u64 *)image)[0] = (u64)code_base;
-		((u64 *)image)[1] = local_paca->kernel_toc;
+	/* Function descriptor nastiness: Address + TOC */
+	((u64 *)image)[0] = (u64)code_base;
+	((u64 *)image)[1] = local_paca->kernel_toc;
 #endif
-		fp->bpf_func = (void *)image;
-		fp->jited = 1;
-	}
+
+	fp->bpf_func = (void *)image;
+	fp->jited = 1;
+
 out:
 	kfree(addrs);
 	return;
diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
index 0fe98a5..89b6a86 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c
@@ -1046,16 +1046,16 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
 		 */
 		bpf_jit_dump(flen, proglen, pass, code_base);
 
-	if (image) {
-		bpf_flush_icache(bpf_hdr, image + alloclen);
+	bpf_flush_icache(bpf_hdr, image + alloclen);
+
 #ifdef PPC64_ELF_ABI_v1
-		/* Function descriptor nastiness: Address + TOC */
-		((u64 *)image)[0] = (u64)code_base;
-		((u64 *)image)[1] = local_paca->kernel_toc;
+	/* Function descriptor nastiness: Address + TOC */
+	((u64 *)image)[0] = (u64)code_base;
+	((u64 *)image)[1] = local_paca->kernel_toc;
 #endif
-		fp->bpf_func = (void *)image;
-		fp->jited = 1;
-	}
+
+	fp->bpf_func = (void *)image;
+	fp->jited = 1;
 
 out:
 	kfree(addrs);
-- 
2.10.2