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From: Colin King <colin.king@canonical.com>
To: Jakub Kicinski <jakub.kicinski@netronome.com>,
	"David S . Miller" <davem@davemloft.net>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
	Yonghong Song <yhs@fb.com>,
	netdev@vger.kernel.org, bpf@vger.kernel.org,
	oss-drivers@netronome.com
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] nfp: bpf: make array exp_mask static, makes object smaller
Date: Mon,  7 Oct 2019 12:52:39 +0100	[thread overview]
Message-ID: <20191007115239.1742-1-colin.king@canonical.com> (raw)

From: Colin Ian King <colin.king@canonical.com>

Don't populate the array exp_mask on the stack but instead make it
static. Makes the object code smaller by 224 bytes.

Before:
   text	   data	    bss	    dec	    hex	filename
  77832	   2290	      0	  80122	  138fa	ethernet/netronome/nfp/bpf/jit.o

After:
   text	   data	    bss	    dec	    hex	filename
  77544	   2354	      0	  79898	  1381a	ethernet/netronome/nfp/bpf/jit.o

(gcc version 9.2.1, amd64)

Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/net/ethernet/netronome/nfp/bpf/jit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
index 5afcb3c4c2ef..c80bb83c8ac9 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
@@ -3952,7 +3952,7 @@ static void nfp_bpf_opt_neg_add_sub(struct nfp_prog *nfp_prog)
 static void nfp_bpf_opt_ld_mask(struct nfp_prog *nfp_prog)
 {
 	struct nfp_insn_meta *meta1, *meta2;
-	const s32 exp_mask[] = {
+	static const s32 exp_mask[] = {
 		[BPF_B] = 0x000000ffU,
 		[BPF_H] = 0x0000ffffU,
 		[BPF_W] = 0xffffffffU,
-- 
2.20.1


             reply	other threads:[~2019-10-07 11:52 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-07 11:52 Colin King [this message]
2019-10-07 15:58 ` [PATCH] nfp: bpf: make array exp_mask static, makes object smaller Jakub Kicinski
2019-10-08 19:13 ` Jakub Kicinski

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