linux-kernel - [PATCH] string: implement streq()

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Date:   Sat, 1 Apr 2023 20:48:05 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] string: implement streq()

Most of the time strcmp() is being used, strings are checked for equality.
Add wrapper to relay such intent (it is shorter to type, too).

Use
	if (streq(s, "s")) {
	}
or
	if (!streq(s, "s")) {
	}

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---

 drivers/clk/socfpga/clk-gate-a10.c |    2 --
 drivers/clk/socfpga/clk.h          |    1 -
 include/linux/string.h             |    6 ++++++
 scripts/dtc/dtc.h                  |    6 +++++-
 4 files changed, 11 insertions(+), 4 deletions(-)

--- a/drivers/clk/socfpga/clk-gate-a10.c
+++ b/drivers/clk/socfpga/clk-gate-a10.c
@@ -11,8 +11,6 @@
 
 #include "clk.h"
 
-#define streq(a, b) (strcmp((a), (b)) == 0)
-
 #define to_socfpga_gate_clk(p) container_of(p, struct socfpga_gate_clk, hw.hw)
 
 /* SDMMC Group for System Manager defines */
--- a/drivers/clk/socfpga/clk.h
+++ b/drivers/clk/socfpga/clk.h
@@ -19,7 +19,6 @@
 
 #define SOCFPGA_MAX_PARENTS		5
 
-#define streq(a, b) (strcmp((a), (b)) == 0)
 #define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel) \
 	((((smplsel) & 0x7) << 3) | (((drvsel) & 0x7) << 0))
 
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -47,6 +47,12 @@ extern size_t strlcat(char *, const char *, __kernel_size_t);
 #ifndef __HAVE_ARCH_STRCMP
 extern int strcmp(const char *,const char *);
 #endif
+
+static inline bool streq(const char *a, const char *b)
+{
+	return strcmp(a, b) == 0;
+}
+
 #ifndef __HAVE_ARCH_STRNCMP
 extern int strncmp(const char *,const char *,__kernel_size_t);
 #endif
--- a/scripts/dtc/dtc.h
+++ b/scripts/dtc/dtc.h
@@ -88,7 +88,11 @@ static inline uint64_t dtb_ld64(const void *p)
 		| bp[7];
 }
 
-#define streq(a, b)	(strcmp((a), (b)) == 0)
+static inline bool streq(const char *a, const char *b)
+{
+	return strcmp(a, b) == 0;
+}
+
 #define strstarts(s, prefix)	(strncmp((s), (prefix), strlen(prefix)) == 0)
 #define strprefixeq(a, n, b)	(strlen(b) == (n) && (memcmp(a, b, n) == 0))
 static inline bool strends(const char *str, const char *suffix)