From 748e4f3d702def1a4bff191e0cf93b6a05340f01 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:41:34 +0000
Subject: [PATCH] add gpio led uart
---
kernel/include/linux/string.h | 68 +++++++++++++++++++++++++--------
1 files changed, 51 insertions(+), 17 deletions(-)
diff --git a/kernel/include/linux/string.h b/kernel/include/linux/string.h
index 9ba9a0f..32688d7 100644
--- a/kernel/include/linux/string.h
+++ b/kernel/include/linux/string.h
@@ -2,7 +2,6 @@
#ifndef _LINUX_STRING_H_
#define _LINUX_STRING_H_
-
#include <linux/compiler.h> /* for inline */
#include <linux/types.h> /* for size_t */
#include <linux/stddef.h> /* for NULL */
@@ -62,6 +61,7 @@
#ifndef __HAVE_ARCH_STRCHRNUL
extern char * strchrnul(const char *,int);
#endif
+extern char * strnchrnul(const char *, size_t, int);
#ifndef __HAVE_ARCH_STRNCHR
extern char * strnchr(const char *, size_t, int);
#endif
@@ -135,6 +135,13 @@
return memset64((uint64_t *)p, (uintptr_t)v, n);
}
+extern void **__memcat_p(void **a, void **b);
+#define memcat_p(a, b) ({ \
+ BUILD_BUG_ON_MSG(!__same_type(*(a), *(b)), \
+ "type mismatch in memcat_p()"); \
+ (typeof(*a) *)__memcat_p((void **)(a), (void **)(b)); \
+})
+
#ifndef __HAVE_ARCH_MEMCPY
extern void * memcpy(void *,const void *,__kernel_size_t);
#endif
@@ -153,20 +160,13 @@
#ifndef __HAVE_ARCH_MEMCHR
extern void * memchr(const void *,int,__kernel_size_t);
#endif
-#ifndef __HAVE_ARCH_MEMCPY_MCSAFE
-static inline __must_check unsigned long memcpy_mcsafe(void *dst,
- const void *src, size_t cnt)
-{
- memcpy(dst, src, cnt);
- return 0;
-}
-#endif
#ifndef __HAVE_ARCH_MEMCPY_FLUSHCACHE
static inline void memcpy_flushcache(void *dst, const void *src, size_t cnt)
{
memcpy(dst, src, cnt);
}
#endif
+
void *memchr_inv(const void *s, int c, size_t n);
char *strreplace(char *s, char old, char new);
@@ -182,12 +182,6 @@
extern void argv_free(char **argv);
extern bool sysfs_streq(const char *s1, const char *s2);
-extern int kstrtobool(const char *s, bool *res);
-static inline int strtobool(const char *s, bool *res)
-{
- return kstrtobool(s, res);
-}
-
int match_string(const char * const *array, size_t n, const char *string);
int __sysfs_match_string(const char * const *array, size_t n, const char *s);
@@ -222,7 +216,26 @@
}
size_t memweight(const void *ptr, size_t bytes);
-void memzero_explicit(void *s, size_t count);
+
+/**
+ * memzero_explicit - Fill a region of memory (e.g. sensitive
+ * keying data) with 0s.
+ * @s: Pointer to the start of the area.
+ * @count: The size of the area.
+ *
+ * Note: usually using memset() is just fine (!), but in cases
+ * where clearing out _local_ data at the end of a scope is
+ * necessary, memzero_explicit() should be used instead in
+ * order to prevent the compiler from optimising away zeroing.
+ *
+ * memzero_explicit() doesn't need an arch-specific version as
+ * it just invokes the one of memset() implicitly.
+ */
+static inline void memzero_explicit(void *s, size_t count)
+{
+ memset(s, 0, count);
+ barrier_data(s);
+}
/**
* kbasename - return the last part of a pathname.
@@ -246,7 +259,7 @@
#if !defined(__NO_FORTIFY) && defined(__OPTIMIZE__) && defined(CONFIG_FORTIFY_SOURCE)
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr);
extern int __underlying_memcmp(const void *p, const void *q, __kernel_size_t size) __RENAME(memcmp);
extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy);
@@ -494,4 +507,25 @@
memcpy(dest, src, dest_len);
}
+/**
+ * str_has_prefix - Test if a string has a given prefix
+ * @str: The string to test
+ * @prefix: The string to see if @str starts with
+ *
+ * A common way to test a prefix of a string is to do:
+ * strncmp(str, prefix, sizeof(prefix) - 1)
+ *
+ * But this can lead to bugs due to typos, or if prefix is a pointer
+ * and not a constant. Instead use str_has_prefix().
+ *
+ * Returns:
+ * * strlen(@prefix) if @str starts with @prefix
+ * * 0 if @str does not start with @prefix
+ */
+static __always_inline size_t str_has_prefix(const char *str, const char *prefix)
+{
+ size_t len = strlen(prefix);
+ return strncmp(str, prefix, len) == 0 ? len : 0;
+}
+
#endif /* _LINUX_STRING_H_ */
--
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