linux-kernel - [PATCH v2 05/16] scripts/kallsyms: remove redundant is_arm_mapping

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Message-Id: <20191123160444.11251-6-yamada.masahiro@socionext.com>
Date:   Sun, 24 Nov 2019 01:04:33 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-kbuild@...r.kernel.org
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 05/16] scripts/kallsyms: remove redundant is_arm_mapping_symbol()

Since commit 6f00df24ee39 ("[PATCH] Strip local symbols from kallsyms"),
all symbols starting '$' are ignored.

is_arm_mapping_symbol() particularly ignores $a, $t, etc. but it is
redundant.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

Changes in v2: None

 scripts/kallsyms.c | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index c9efb67c6ecb..14a50c8d3f34 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -74,16 +74,6 @@ static void usage(void)
 	exit(1);
 }
 
-/*
- * This ignores the intensely annoying "mapping symbols" found
- * in ARM ELF files: $a, $t and $d.
- */
-static int is_arm_mapping_symbol(const char *str)
-{
-	return str[0] == '$' && strchr("axtd", str[1])
-	       && (str[2] == '\0' || str[2] == '.');
-}
-
 static int check_symbol_range(const char *sym, unsigned long long addr,
 			      struct addr_range *ranges, int entries)
 {
@@ -139,10 +129,13 @@ static int read_symbol(FILE *in, struct sym_entry *s)
 			return -1;
 
 	}
-	else if (toupper(stype) == 'U' ||
-		 is_arm_mapping_symbol(sym))
+	else if (toupper(stype) == 'U')
 		return -1;
-	/* exclude also MIPS ELF local symbols ($L123 instead of .L123) */
+	/*
+	 * Ignore generated symbols such as:
+	 *  - mapping symbols in ARM ELF files ($a, $t, and $d)
+	 *  - MIPS ELF local symbols ($L123 instead of .L123)
+	 */
 	else if (sym[0] == '$')
 		return -1;
 	/* exclude debugging symbols */
-- 
2.17.1