From 23fa18eaa71266feff7ba8d83022d9e1cc83c65a Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:42:03 +0000
Subject: [PATCH] disable pwm7
---
kernel/include/linux/overflow.h | 72 +++++++++++++++++++++++++----------
1 files changed, 51 insertions(+), 21 deletions(-)
diff --git a/kernel/include/linux/overflow.h b/kernel/include/linux/overflow.h
index 4564a17..ef74051 100644
--- a/kernel/include/linux/overflow.h
+++ b/kernel/include/linux/overflow.h
@@ -44,6 +44,16 @@
#define is_non_negative(a) ((a) > 0 || (a) == 0)
#define is_negative(a) (!(is_non_negative(a)))
+/*
+ * Allows for effectively applying __must_check to a macro so we can have
+ * both the type-agnostic benefits of the macros while also being able to
+ * enforce that the return value is, in fact, checked.
+ */
+static inline bool __must_check __must_check_overflow(bool overflow)
+{
+ return unlikely(overflow);
+}
+
#ifdef COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW
/*
* For simplicity and code hygiene, the fallback code below insists on
@@ -53,32 +63,32 @@
* alias for __builtin_add_overflow, but add type checks similar to
* below.
*/
-#define check_add_overflow(a, b, d) ({ \
+#define check_add_overflow(a, b, d) __must_check_overflow(({ \
typeof(a) __a = (a); \
typeof(b) __b = (b); \
typeof(d) __d = (d); \
(void) (&__a == &__b); \
(void) (&__a == __d); \
__builtin_add_overflow(__a, __b, __d); \
-})
+}))
-#define check_sub_overflow(a, b, d) ({ \
+#define check_sub_overflow(a, b, d) __must_check_overflow(({ \
typeof(a) __a = (a); \
typeof(b) __b = (b); \
typeof(d) __d = (d); \
(void) (&__a == &__b); \
(void) (&__a == __d); \
__builtin_sub_overflow(__a, __b, __d); \
-})
+}))
-#define check_mul_overflow(a, b, d) ({ \
+#define check_mul_overflow(a, b, d) __must_check_overflow(({ \
typeof(a) __a = (a); \
typeof(b) __b = (b); \
typeof(d) __d = (d); \
(void) (&__a == &__b); \
(void) (&__a == __d); \
__builtin_mul_overflow(__a, __b, __d); \
-})
+}))
#else
@@ -191,21 +201,20 @@
})
-#define check_add_overflow(a, b, d) \
+#define check_add_overflow(a, b, d) __must_check_overflow( \
__builtin_choose_expr(is_signed_type(typeof(a)), \
__signed_add_overflow(a, b, d), \
- __unsigned_add_overflow(a, b, d))
+ __unsigned_add_overflow(a, b, d)))
-#define check_sub_overflow(a, b, d) \
+#define check_sub_overflow(a, b, d) __must_check_overflow( \
__builtin_choose_expr(is_signed_type(typeof(a)), \
__signed_sub_overflow(a, b, d), \
- __unsigned_sub_overflow(a, b, d))
+ __unsigned_sub_overflow(a, b, d)))
-#define check_mul_overflow(a, b, d) \
+#define check_mul_overflow(a, b, d) __must_check_overflow( \
__builtin_choose_expr(is_signed_type(typeof(a)), \
__signed_mul_overflow(a, b, d), \
- __unsigned_mul_overflow(a, b, d))
-
+ __unsigned_mul_overflow(a, b, d)))
#endif /* COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW */
@@ -228,7 +237,7 @@
* '*d' will hold the results of the attempted shift, but is not
* considered "safe for use" if false is returned.
*/
-#define check_shl_overflow(a, s, d) ({ \
+#define check_shl_overflow(a, s, d) __must_check_overflow(({ \
typeof(a) _a = a; \
typeof(s) _s = s; \
typeof(d) _d = d; \
@@ -238,7 +247,7 @@
*_d = (_a_full << _to_shift); \
(_to_shift != _s || is_negative(*_d) || is_negative(_a) || \
(*_d >> _to_shift) != _a); \
-})
+}))
/**
* array_size() - Calculate size of 2-dimensional array.
@@ -285,11 +294,15 @@
return bytes;
}
-static inline __must_check size_t __ab_c_size(size_t n, size_t size, size_t c)
+/*
+ * Compute a*b+c, returning SIZE_MAX on overflow. Internal helper for
+ * struct_size() below.
+ */
+static inline __must_check size_t __ab_c_size(size_t a, size_t b, size_t c)
{
size_t bytes;
- if (check_mul_overflow(n, size, &bytes))
+ if (check_mul_overflow(a, b, &bytes))
return SIZE_MAX;
if (check_add_overflow(bytes, c, &bytes))
return SIZE_MAX;
@@ -301,16 +314,33 @@
* struct_size() - Calculate size of structure with trailing array.
* @p: Pointer to the structure.
* @member: Name of the array member.
- * @n: Number of elements in the array.
+ * @count: Number of elements in the array.
*
* Calculates size of memory needed for structure @p followed by an
- * array of @n @member elements.
+ * array of @count number of @member elements.
*
* Return: number of bytes needed or SIZE_MAX on overflow.
*/
-#define struct_size(p, member, n) \
- __ab_c_size(n, \
+#define struct_size(p, member, count) \
+ __ab_c_size(count, \
sizeof(*(p)->member) + __must_be_array((p)->member),\
sizeof(*(p)))
+/**
+ * flex_array_size() - Calculate size of a flexible array member
+ * within an enclosing structure.
+ *
+ * @p: Pointer to the structure.
+ * @member: Name of the flexible array member.
+ * @count: Number of elements in the array.
+ *
+ * Calculates size of a flexible array of @count number of @member
+ * elements, at the end of structure @p.
+ *
+ * Return: number of bytes needed or SIZE_MAX on overflow.
+ */
+#define flex_array_size(p, member, count) \
+ array_size(count, \
+ sizeof(*(p)->member) + __must_be_array((p)->member))
+
#endif /* __LINUX_OVERFLOW_H */
--
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