From: David S. Miller <davem@davemloft.net>
Date: Thu, 1 Jun 2017 02:35:00 +0000 (-0700)
Subject: bpf: Take advantage of stack_depth tracking in sparc64 JIT
X-Git-Tag: v4.13-rc1~157^2~327
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=a5e2ee5da47412c98b023acb49d0787e40e4ec6a;p=linux.git

bpf: Take advantage of stack_depth tracking in sparc64 JIT

Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/arch/sparc/net/bpf_jit_comp_64.c b/arch/sparc/net/bpf_jit_comp_64.c
index 4a52d34facf9..098874a81f6e 100644
--- a/arch/sparc/net/bpf_jit_comp_64.c
+++ b/arch/sparc/net/bpf_jit_comp_64.c
@@ -802,8 +802,13 @@ static void build_prologue(struct jit_ctx *ctx)
 {
 	s32 stack_needed = BASE_STACKFRAME;
 
-	if (ctx->saw_frame_pointer || ctx->saw_tail_call)
-		stack_needed += MAX_BPF_STACK;
+	if (ctx->saw_frame_pointer || ctx->saw_tail_call) {
+		struct bpf_prog *prog = ctx->prog;
+		u32 stack_depth;
+
+		stack_depth = prog->aux->stack_depth;
+		stack_needed += round_up(stack_depth, 16);
+	}
 
 	if (ctx->saw_tail_call)
 		stack_needed += 8;