linux-kernel - [PATCH v6 03/11] scripts/kallsyms: remove helper sym

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Message-ID: <20220924122051.362-4-thunder.leizhen@huawei.com>
Date:   Sat, 24 Sep 2022 20:20:43 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        <live-patching@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Luis Chamberlain" <mcgrof@...nel.org>,
        <linux-modules@...r.kernel.org>,
        "Steven Rostedt" <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
CC:     Zhen Lei <thunder.leizhen@...wei.com>
Subject: [PATCH v6 03/11] scripts/kallsyms: remove helper sym_name() and cleanup

Now, the type and name of a symbol are no longer stored together. So the
helper sym_name() is no longer needed. Correspondingly, replacing the
field name 'sym[]' with 'name[]' is more accurate.

Suggested-by: Petr Mladek <pmladek@...e.com>
Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
 scripts/kallsyms.c | 29 ++++++++++++-----------------
 1 file changed, 12 insertions(+), 17 deletions(-)

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 296277128d450ff..ca378a7e9425c00 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -35,7 +35,7 @@ struct sym_entry {
 	unsigned int start_pos;
 	unsigned int percpu_absolute;
 	unsigned char type;
-	unsigned char sym[];
+	unsigned char name[];
 };
 
 struct addr_range {
@@ -76,11 +76,6 @@ static void usage(void)
 	exit(1);
 }
 
-static char *sym_name(const struct sym_entry *s)
-{
-	return (char *)s->sym;
-}
-
 static bool is_ignored_symbol(const char *name, char type)
 {
 	/* Symbol names that exactly match to the following are ignored.*/
@@ -238,7 +233,7 @@ static struct sym_entry *read_symbol(FILE *in)
 	sym->addr = addr;
 	sym->len = len;
 	sym->type = type;
-	strcpy(sym_name(sym), name);
+	strcpy((char *)sym->name, name);
 	sym->percpu_absolute = 0;
 
 	return sym;
@@ -262,7 +257,7 @@ static int symbol_in_range(const struct sym_entry *s,
 
 static int symbol_valid(const struct sym_entry *s)
 {
-	const char *name = sym_name(s);
+	const char *name = (char *)s->name;
 
 	/* if --all-symbols is not specified, then symbols outside the text
 	 * and inittext sections are discarded */
@@ -475,7 +470,7 @@ static void write_src(void)
 		printf("\t.byte 0x%02x", table[i]->len + 1);
 		printf(", 0x%02x", table[i]->type);
 		for (k = 0; k < table[i]->len; k++)
-			printf(", 0x%02x", table[i]->sym[k]);
+			printf(", 0x%02x", table[i]->name[k]);
 		printf("\n");
 
 		/* fields 'len' and 'type' occupy one byte each */
@@ -533,7 +528,7 @@ static void build_initial_token_table(void)
 	unsigned int i;
 
 	for (i = 0; i < table_cnt; i++)
-		learn_symbol(table[i]->sym, table[i]->len);
+		learn_symbol(table[i]->name, table[i]->len);
 }
 
 static unsigned char *find_token(unsigned char *str, int len,
@@ -558,14 +553,14 @@ static void compress_symbols(const unsigned char *str, int idx)
 	for (i = 0; i < table_cnt; i++) {
 
 		len = table[i]->len;
-		p1 = table[i]->sym;
+		p1 = table[i]->name;
 
 		/* find the token on the symbol */
 		p2 = find_token(p1, len, str);
 		if (!p2) continue;
 
 		/* decrease the counts for this symbol's tokens */
-		forget_symbol(table[i]->sym, len);
+		forget_symbol(table[i]->name, len);
 
 		size = len;
 
@@ -587,7 +582,7 @@ static void compress_symbols(const unsigned char *str, int idx)
 		table[i]->len = len;
 
 		/* increase the counts for this symbol's new tokens */
-		learn_symbol(table[i]->sym, len);
+		learn_symbol(table[i]->name, len);
 	}
 }
 
@@ -645,7 +640,7 @@ static void insert_real_symbols_in_table(void)
 
 	for (i = 0; i < table_cnt; i++) {
 		for (j = 0; j < table[i]->len; j++) {
-			c = table[i]->sym[j];
+			c = table[i]->name[j];
 			best_table[c][0] = c;
 			best_table_len[c] = 1;
 		}
@@ -667,7 +662,7 @@ static void optimize_token_table(void)
 /* guess for "linker script provide" symbol */
 static int may_be_linker_script_provide_symbol(const struct sym_entry *se)
 {
-	const char *symbol = sym_name(se);
+	const char *symbol = (char *)se->name;
 	int len = se->len;
 
 	if (len < 8)
@@ -724,8 +719,8 @@ static int compare_symbols(const void *a, const void *b)
 		return wa - wb;
 
 	/* sort by the number of prefix underscores */
-	wa = strspn(sym_name(sa), "_");
-	wb = strspn(sym_name(sb), "_");
+	wa = strspn((char *)sa->name, "_");
+	wb = strspn((char *)sb->name, "_");
 	if (wa != wb)
 		return wa - wb;
 
-- 
2.25.1