linux-kernel - [PATCH 1/2] kernel/bpf: change "char *" string form to "char []"

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Message-Id: <20220512142814.26705-1-liqiong@nfschina.com>
Date:   Thu, 12 May 2022 22:28:14 +0800
From:   liqiong <liqiong@...china.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, hukun@...china.com,
        qixu@...china.com, yuzhe@...china.com, renyu@...china.com,
        liqiong <liqiong@...china.com>
Subject: [PATCH 1/2] kernel/bpf: change "char *" string form to "char []"

The string form of "char []" declares a single variable. It is better
than "char *" which creates two variables.

Signed-off-by: liqiong <liqiong@...china.com>
---
 kernel/bpf/btf.c      | 4 ++--
 kernel/bpf/verifier.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 0918a39279f6..218a8ac73644 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -894,10 +894,10 @@ static const struct btf_type *btf_type_skip_qualifiers(const struct btf *btf,
 static const char *btf_show_name(struct btf_show *show)
 {
 	/* BTF_MAX_ITER array suffixes "[]" */
-	const char *array_suffixes = "[][][][][][][][][][]";
+	static const char array_suffixes[] = "[][][][][][][][][][]";
 	const char *array_suffix = &array_suffixes[strlen(array_suffixes)];
 	/* BTF_MAX_ITER pointer suffixes "*" */
-	const char *ptr_suffixes = "**********";
+	static const char ptr_suffixes[] = "**********";
 	const char *ptr_suffix = &ptr_suffixes[strlen(ptr_suffixes)];
 	const char *name = NULL, *prefix = "", *parens = "";
 	const struct btf_member *m = show->state.member;
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index d175b70067b3..78a090fcbc72 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -7346,7 +7346,7 @@ static int sanitize_err(struct bpf_verifier_env *env,
 			const struct bpf_reg_state *off_reg,
 			const struct bpf_reg_state *dst_reg)
 {
-	static const char *err = "pointer arithmetic with it prohibited for !root";
+	static const char err[] = "pointer arithmetic with it prohibited for !root";
 	const char *op = BPF_OP(insn->code) == BPF_ADD ? "add" : "sub";
 	u32 dst = insn->dst_reg, src = insn->src_reg;
 
-- 
2.25.1