linux-kernel - [PATCH v2 2/3] lib/vsprintf: Split out sprintf() and friends

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Message-Id: <20230805175027.50029-3-andriy.shevchenko@linux.intel.com>
Date:   Sat,  5 Aug 2023 20:50:26 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Petr Mladek <pmladek@...e.com>, Marco Elver <elver@...gle.com>,
        linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-mm@...ck.org
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v2 2/3] lib/vsprintf: Split out sprintf() and friends

kernel.h is being used as a dump for all kinds of stuff for a long time.
sprintf() and friends are used in many drivers without need of the full
kernel.h dependency train with it.

Here is the attempt on cleaning it up by splitting out sprintf() and
friends.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 include/linux/kernel.h  | 30 +-----------------------------
 include/linux/sprintf.h | 25 +++++++++++++++++++++++++
 lib/test_printf.c       |  1 +
 lib/vsprintf.c          |  1 +
 4 files changed, 28 insertions(+), 29 deletions(-)
 create mode 100644 include/linux/sprintf.h

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index b9e76f717a7e..cee8fe87e9f4 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -29,6 +29,7 @@
 #include <linux/panic.h>
 #include <linux/printk.h>
 #include <linux/build_bug.h>
+#include <linux/sprintf.h>
 #include <linux/static_call_types.h>
 #include <linux/instruction_pointer.h>
 #include <asm/byteorder.h>
@@ -203,35 +204,6 @@ static inline void might_fault(void) { }
 
 void do_exit(long error_code) __noreturn;
 
-extern int num_to_str(char *buf, int size,
-		      unsigned long long num, unsigned int width);
-
-/* lib/printf utilities */
-
-extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...);
-extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list);
-extern __printf(3, 4)
-int snprintf(char *buf, size_t size, const char *fmt, ...);
-extern __printf(3, 0)
-int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
-extern __printf(3, 4)
-int scnprintf(char *buf, size_t size, const char *fmt, ...);
-extern __printf(3, 0)
-int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
-extern __printf(2, 3) __malloc
-char *kasprintf(gfp_t gfp, const char *fmt, ...);
-extern __printf(2, 0) __malloc
-char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
-extern __printf(2, 0)
-const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list args);
-
-extern __scanf(2, 3)
-int sscanf(const char *, const char *, ...);
-extern __scanf(2, 0)
-int vsscanf(const char *, const char *, va_list);
-
-extern int no_hash_pointers_enable(char *str);
-
 extern int get_option(char **str, int *pint);
 extern char *get_options(const char *str, int nints, int *ints);
 extern unsigned long long memparse(const char *ptr, char **retptr);
diff --git a/include/linux/sprintf.h b/include/linux/sprintf.h
new file mode 100644
index 000000000000..9ca23bcf9f42
--- /dev/null
+++ b/include/linux/sprintf.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_KERNEL_SPRINTF_H_
+#define _LINUX_KERNEL_SPRINTF_H_
+
+#include <linux/compiler_attributes.h>
+#include <linux/types.h>
+
+int num_to_str(char *buf, int size, unsigned long long num, unsigned int width);
+
+__printf(2, 3) int sprintf(char *buf, const char * fmt, ...);
+__printf(2, 0) int vsprintf(char *buf, const char *, va_list);
+__printf(3, 4) int snprintf(char *buf, size_t size, const char *fmt, ...);
+__printf(3, 0) int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
+__printf(3, 4) int scnprintf(char *buf, size_t size, const char *fmt, ...);
+__printf(3, 0) int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
+__printf(2, 3) __malloc char *kasprintf(gfp_t gfp, const char *fmt, ...);
+__printf(2, 0) __malloc char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
+__printf(2, 0) const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list args);
+
+__scanf(2, 3) int sscanf(const char *, const char *, ...);
+__scanf(2, 0) int vsscanf(const char *, const char *, va_list);
+
+int no_hash_pointers_enable(char *str);
+
+#endif	/* _LINUX_KERNEL_SPRINTF_H */
diff --git a/lib/test_printf.c b/lib/test_printf.c
index 2ab09a0dc841..5adca19d34e2 100644
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -19,6 +19,7 @@
 #include <linux/rtc.h>
 #include <linux/slab.h>
 #include <linux/socket.h>
+#include <linux/sprintf.h>
 #include <linux/string.h>
 
 #include "../tools/testing/selftests/kselftest_module.h"
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index b17e0744a7bc..c89719586d0c 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -35,6 +35,7 @@
 #include <linux/property.h>
 #include <linux/rtc.h>
 #include <linux/siphash.h>
+#include <linux/sprintf.h>
 #include <linux/stdarg.h>
 #include <linux/string.h>
 #include <linux/string_helpers.h>
-- 
2.40.0.1.gaa8946217a0b