modify sin led gpio

hc

2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e

 kernel/tools/include/linux/err.h
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@@ -20,7 +20,7 @@
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  * Userspace note:
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  * The same principle works for userspace, because 'error' pointers
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  * fall down to the unused hole far from user space, as described
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- * in Documentation/x86/x86_64/mm.txt for x86_64 arch:
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+ * in Documentation/x86/x86_64/mm.rst for x86_64 arch:
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  *
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  * 0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm hole caused by [48:63] sign extension
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  * ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
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@@ -52,4 +52,24 @@
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 	return unlikely(!ptr) || IS_ERR_VALUE((unsigned long)ptr);
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 }
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+static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr)
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+{
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+	if (IS_ERR(ptr))
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+		return PTR_ERR(ptr);
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+	else
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+		return 0;
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+}
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+
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+/**
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+ * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
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+ * @ptr: The pointer to cast.
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+ *
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+ * Explicitly cast an error-valued pointer to another pointer type in such a
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+ * way as to make it clear that's what's going on.
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+ */
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+static inline void * __must_check ERR_CAST(__force const void *ptr)
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+{
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+	/* cast away the const */
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+	return (void *) ptr;
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+}
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 #endif /* _LINUX_ERR_H */