From: Puranjay Mohan <puranjay@kernel.org>
To: "Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eduard Zingerman" <eddyz87@gmail.com>,
"Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Stanislav Fomichev" <sdf@google.com>,
"Hao Luo" <haoluo@google.com>, "Jiri Olsa" <jolsa@kernel.org>,
"Björn Töpel" <bjorn@kernel.org>, "Pu Lehui" <pulehui@huawei.com>,
"Puranjay Mohan" <puranjay12@gmail.com>,
"Paul Walmsley" <paul.walmsley@sifive.com>,
"Palmer Dabbelt" <palmer@dabbelt.com>,
"Albert Ou" <aou@eecs.berkeley.edu>,
bpf@vger.kernel.org, linux-riscv@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH bpf-next] riscv, bpf: Optimize stack usage of trampoline
Date: Mon, 8 Jul 2024 11:47:58 +0000 [thread overview]
Message-ID: <20240708114758.64414-1-puranjay@kernel.org> (raw)
When BPF_TRAMP_F_CALL_ORIG is not set, stack space for passing arguments
on stack doesn't need to be reserved because the original function is
not called.
Only reserve space for stacked arguments when BPF_TRAMP_F_CALL_ORIG is
set.
Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
---
arch/riscv/net/bpf_jit_comp64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c
index 685c7389ae7e..0795efdd3519 100644
--- a/arch/riscv/net/bpf_jit_comp64.c
+++ b/arch/riscv/net/bpf_jit_comp64.c
@@ -892,7 +892,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
stack_size += 8;
sreg_off = stack_size;
- if (nr_arg_slots - RV_MAX_REG_ARGS > 0)
+ if ((flags & BPF_TRAMP_F_CALL_ORIG) && (nr_arg_slots - RV_MAX_REG_ARGS > 0))
stack_size += (nr_arg_slots - RV_MAX_REG_ARGS) * 8;
stack_size = round_up(stack_size, STACK_ALIGN);
--
2.40.1
next reply other threads:[~2024-07-08 11:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-08 11:47 Puranjay Mohan [this message]
2024-07-08 12:02 ` [PATCH bpf-next] riscv, bpf: Optimize stack usage of trampoline Pu Lehui
2024-07-08 13:50 ` patchwork-bot+netdevbpf
2024-07-23 12:58 ` patchwork-bot+linux-riscv
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