--- zzzz-none-000/linux-4.9.279/lib/kstrtox.c	2021-08-08 06:38:54.000000000 +0000
+++ puma7-atom-6591-750/linux-4.9.279/lib/kstrtox.c	2023-02-08 11:43:43.000000000 +0000
@@ -405,3 +405,68 @@
 kstrto_from_user(kstrtos16_from_user,	kstrtos16,	s16);
 kstrto_from_user(kstrtou8_from_user,	kstrtou8,	u8);
 kstrto_from_user(kstrtos8_from_user,	kstrtos8,	s8);
+
+/*
+ * Functions defined by this macro work the same as `kstrtox_from_user`
+ * functions but they ignore leading and trailing `chars` (typically
+ * whitespaces) in given string `s`.
+ *
+ * This macro is useful for reading /proc input which may have newline unless
+ * `echo -n` is used while writing to /proc.
+ */
+#define kstrto_from_user_strip(f, g, type)				\
+int f(const char __user *s, size_t count, unsigned int base, type *res,	\
+      const char *chars)						\
+{									\
+	/* sign, base 2 representation, newline, terminator */		\
+	char buf[1 + sizeof(type) * 8 + 1 + 1];				\
+	char *b = buf, *c = NULL;					\
+									\
+	count = min(count, sizeof(buf) - 1);				\
+	if (copy_from_user(buf, s, count))				\
+		return -EFAULT;						\
+									\
+	for (b[count] = '\0'; b && (c = strsep(&b, chars)) && !strlen(c); );\
+									\
+	return g(c, base, res);						\
+}									\
+EXPORT_SYMBOL(f)
+
+kstrto_from_user_strip(kstrtouint_from_user_strip,	kstrtouint,	unsigned int);
+kstrto_from_user_strip(kstrtoint_from_user_strip,	kstrtoint,	int);
+kstrto_from_user_strip(kstrtos32_from_user_strip,	kstrtos32,	s32);
+kstrto_from_user_strip(kstrtou32_from_user_strip,	kstrtou32,	u32);
+kstrto_from_user_strip(kstrtou16_from_user_strip,	kstrtou16,	u16);
+kstrto_from_user_strip(kstrtou8_from_user_strip,	kstrtou8,	u8);
+
+#define kstrto_from_user_strip_whitespaces(f, g, type)			\
+int f(const char __user *s, size_t count, type *res)			\
+{									\
+	return g(s, count, 10, res, " \n\t");				\
+}									\
+EXPORT_SYMBOL(f)
+
+kstrto_from_user_strip_whitespaces(
+	kstrtouint_from_user_strip_whitespaces,
+	kstrtouint_from_user_strip,
+	unsigned int);
+kstrto_from_user_strip_whitespaces(
+	kstrtoint_from_user_strip_whitespaces,
+	kstrtoint_from_user_strip,
+	int);
+kstrto_from_user_strip_whitespaces(
+	kstrtos32_from_user_strip_whitespaces,
+	kstrtos32_from_user_strip,
+	s32);
+kstrto_from_user_strip_whitespaces(
+	kstrtou32_from_user_strip_whitespaces,
+	kstrtou32_from_user_strip,
+	u32);
+kstrto_from_user_strip_whitespaces(
+	kstrtou16_from_user_strip_whitespaces,
+	kstrtou16_from_user_strip,
+	u16);
+kstrto_from_user_strip_whitespaces(
+	kstrtou8_from_user_strip_whitespaces,
+	kstrtou8_from_user_strip,
+	u8);