From: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Date: Mon, 27 Mar 2017 19:37:41 +0000 (+0530)
Subject: powerpc/bpf: Use memset32() to pre-fill traps in BPF page(s)
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6acdc9a6bad9f23771d24baca763141a24ead6cb;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

powerpc/bpf: Use memset32() to pre-fill traps in BPF page(s)

Use the newly introduced memset32() to pre-fill BPF page(s) with trap
instructions.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---

diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
index 861c5af1c9c4..6ba5d253e857 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c
@@ -25,11 +25,7 @@ int bpf_jit_enable __read_mostly;
 
 static void bpf_jit_fill_ill_insns(void *area, unsigned int size)
 {
-	int *p = area;
-
-	/* Fill whole space with trap instructions */
-	while (p < (int *)((char *)area + size))
-		*p++ = BREAKPOINT_INSTRUCTION;
+	memset32(area, BREAKPOINT_INSTRUCTION, size/4);
 }
 
 static inline void bpf_flush_icache(void *start, void *end)