[PATCH net-next] bpf: Take advantage of stack_depth tracking in sparc64 JIT
DORMANTno replies
From: David Miller <davem@davemloft.net>
Date: 2017-06-01 02:40:27
Also in:
sparclinux
Subsystem:
bpf jit for sparc (32-bit and 64-bit), bpf [general] (safe dynamic programs and tools), sparc + ultrasparc (sparc/sparc64), the rest · Maintainers:
David S. Miller, Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Andreas Larsson, Linus Torvalds
Signed-off-by: David S. Miller <davem@davemloft.net> --- Committed to net-next. arch/sparc/net/bpf_jit_comp_64.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/arch/sparc/net/bpf_jit_comp_64.c b/arch/sparc/net/bpf_jit_comp_64.c
index 4a52d34..098874a 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;
--
2.1.2.532.g19b5d50