From: Zi Shen Lim <zlim.lnx@gmail.com>
To: "David S. Miller" <davem@davemloft.net>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>
Cc: Zi Shen Lim <zlim.lnx@gmail.com>, Yang Shi <yang.shi@linaro.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH net-next 3/3] arm64: bpf: optimize LD_ABS, LD_IND
Date: Sat, 4 Jun 2016 15:00:30 -0700 [thread overview]
Message-ID: <1465077630-633-3-git-send-email-zlim.lnx@gmail.com> (raw)
In-Reply-To: <1465077630-633-1-git-send-email-zlim.lnx@gmail.com>
Remove superfluous stack frame, saving us 3 instructions for every
LD_ABS or LD_IND.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
---
arch/arm64/net/bpf_jit_comp.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index 7ae304e..b2fc97a 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -731,11 +731,8 @@ emit_cond_jmp:
emit_a64_mov_i64(r3, size, ctx);
emit(A64_SUB_I(1, r4, fp, STACK_SIZE), ctx);
emit_a64_mov_i64(r5, (unsigned long)bpf_load_pointer, ctx);
- emit(A64_PUSH(A64_FP, A64_LR, A64_SP), ctx);
- emit(A64_MOV(1, A64_FP, A64_SP), ctx);
emit(A64_BLR(r5), ctx);
emit(A64_MOV(1, r0, A64_R(0)), ctx);
- emit(A64_POP(A64_FP, A64_LR, A64_SP), ctx);
jmp_offset = epilogue_offset(ctx);
check_imm19(jmp_offset);
--
1.9.1
next prev parent reply other threads:[~2016-06-04 22:01 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-04 22:00 [PATCH net-next 1/3] arm64: bpf: implement bpf_tail_call() helper Zi Shen Lim
2016-06-04 22:00 ` [PATCH net-next 2/3] arm64: bpf: optimize JMP_CALL Zi Shen Lim
2016-06-06 17:05 ` Will Deacon
2016-06-07 4:36 ` Z Lim
2016-06-07 8:10 ` Will Deacon
2016-06-04 22:00 ` Zi Shen Lim [this message]
2016-06-04 23:46 ` [PATCH net-next 1/3] arm64: bpf: implement bpf_tail_call() helper kbuild test robot
2016-06-05 7:53 ` Daniel Borkmann
2016-06-06 4:56 ` Z Lim
2016-06-06 8:11 ` Daniel Borkmann
2016-06-07 2:33 ` Zi Shen Lim
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1465077630-633-3-git-send-email-zlim.lnx@gmail.com \
--to=zlim.lnx@gmail.com \
--cc=ast@kernel.org \
--cc=catalin.marinas@arm.com \
--cc=daniel@iogearbox.net \
--cc=davem@davemloft.net \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=will.deacon@arm.com \
--cc=yang.shi@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).