linux-kernel - [PATCH 07/16] scripts/kallsyms: replace prefix_underscores

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Message-Id: <20191123132727.30151-8-yamada.masahiro@socionext.com>
Date:   Sat, 23 Nov 2019 22:27:18 +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 07/16] scripts/kallsyms: replace prefix_underscores_count() with strspn()

You can do equivalent with strspn(). I do not see noticeable performance
difference.

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

 scripts/kallsyms.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 7b00b4030be4..a007d901c3a5 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -653,16 +653,6 @@ static int may_be_linker_script_provide_symbol(const struct sym_entry *se)
 	return 0;
 }
 
-static int prefix_underscores_count(const char *str)
-{
-	const char *tail = str;
-
-	while (*tail == '_')
-		tail++;
-
-	return tail - str;
-}
-
 static int compare_symbols(const void *a, const void *b)
 {
 	const struct sym_entry *sa;
@@ -691,8 +681,8 @@ static int compare_symbols(const void *a, const void *b)
 		return wa - wb;
 
 	/* sort by the number of prefix underscores */
-	wa = prefix_underscores_count(sym_name(sa));
-	wb = prefix_underscores_count(sym_name(sb));
+	wa = strspn(sym_name(sa), "_");
+	wb = strspn(sym_name(sb), "_");
 	if (wa != wb)
 		return wa - wb;
 
-- 
2.17.1