diff options
Diffstat (limited to 'include/linux/kernel.h')
| -rw-r--r-- | include/linux/kernel.h | 159 |
1 files changed, 5 insertions, 154 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 500def620d8f..2f05e9128201 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -11,6 +11,7 @@ #include <linux/compiler.h> #include <linux/bitops.h> #include <linux/log2.h> +#include <linux/minmax.h> #include <linux/typecheck.h> #include <linux/printk.h> #include <linux/build_bug.h> @@ -186,7 +187,7 @@ * lower_32_bits - return bits 0-31 of a number * @n: the number we're accessing */ -#define lower_32_bits(n) ((u32)(n)) +#define lower_32_bits(n) ((u32)((n) & 0xffffffff)) struct completion; struct pt_regs; @@ -526,7 +527,6 @@ extern unsigned int sysctl_oops_all_cpu_backtrace; #endif /* CONFIG_SMP */ extern void bust_spinlocks(int yes); -extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ extern int panic_timeout; extern unsigned long panic_print; extern int panic_on_oops; @@ -729,7 +729,7 @@ do { \ #define do_trace_printk(fmt, args...) \ do { \ static const char *trace_printk_fmt __used \ - __attribute__((section("__trace_printk_fmt"))) = \ + __section("__trace_printk_fmt") = \ __builtin_constant_p(fmt) ? fmt : NULL; \ \ __trace_printk_check_format(fmt, ##args); \ @@ -773,7 +773,7 @@ int __trace_printk(unsigned long ip, const char *fmt, ...); #define trace_puts(str) ({ \ static const char *trace_printk_fmt __used \ - __attribute__((section("__trace_printk_fmt"))) = \ + __section("__trace_printk_fmt") = \ __builtin_constant_p(str) ? str : NULL; \ \ if (__builtin_constant_p(str)) \ @@ -795,7 +795,7 @@ extern void trace_dump_stack(int skip); do { \ if (__builtin_constant_p(fmt)) { \ static const char *trace_printk_fmt __used \ - __attribute__((section("__trace_printk_fmt"))) = \ + __section("__trace_printk_fmt") = \ __builtin_constant_p(fmt) ? fmt : NULL; \ \ __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ @@ -834,155 +834,6 @@ ftrace_vprintk(const char *fmt, va_list ap) static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } #endif /* CONFIG_TRACING */ -/* - * min()/max()/clamp() macros must accomplish three things: - * - * - avoid multiple evaluations of the arguments (so side-effects like - * "x++" happen only once) when non-constant. - * - perform strict type-checking (to generate warnings instead of - * nasty runtime surprises). See the "unnecessary" pointer comparison - * in __typecheck(). - * - retain result as a constant expressions when called with only - * constant expressions (to avoid tripping VLA warnings in stack - * allocation usage). - */ -#define __typecheck(x, y) \ - (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1))) - -/* - * This returns a constant expression while determining if an argument is - * a constant expression, most importantly without evaluating the argument. - * Glory to Martin Uecker <Martin.Uecker@med.uni-goettingen.de> - */ -#define __is_constexpr(x) \ - (sizeof(int) == sizeof(*(8 ? ((void *)((long)(x) * 0l)) : (int *)8))) - -#define __no_side_effects(x, y) \ - (__is_constexpr(x) && __is_constexpr(y)) - -#define __safe_cmp(x, y) \ - (__typecheck(x, y) && __no_side_effects(x, y)) - -#define __cmp(x, y, op) ((x) op (y) ? (x) : (y)) - -#define __cmp_once(x, y, unique_x, unique_y, op) ({ \ - typeof(x) unique_x = (x); \ - typeof(y) unique_y = (y); \ - __cmp(unique_x, unique_y, op); }) - -#define __careful_cmp(x, y, op) \ - __builtin_choose_expr(__safe_cmp(x, y), \ - __cmp(x, y, op), \ - __cmp_once(x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y), op)) - -/** - * min - return minimum of two values of the same or compatible types - * @x: first value - * @y: second value - */ -#define min(x, y) __careful_cmp(x, y, <) - -/** - * max - return maximum of two values of the same or compatible types - * @x: first value - * @y: second value - */ -#define max(x, y) __careful_cmp(x, y, >) - -/** - * min3 - return minimum of three values - * @x: first value - * @y: second value - * @z: third value - */ -#define min3(x, y, z) min((typeof(x))min(x, y), z) - -/** - * max3 - return maximum of three values - * @x: first value - * @y: second value - * @z: third value - */ -#define max3(x, y, z) max((typeof(x))max(x, y), z) - -/** - * min_not_zero - return the minimum that is _not_ zero, unless both are zero - * @x: value1 - * @y: value2 - */ -#define min_not_zero(x, y) ({ \ - typeof(x) __x = (x); \ - typeof(y) __y = (y); \ - __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) - -/** - * clamp - return a value clamped to a given range with strict typechecking - * @val: current value - * @lo: lowest allowable value - * @hi: highest allowable value - * - * This macro does strict typechecking of @lo/@hi to make sure they are of the - * same type as @val. See the unnecessary pointer comparisons. - */ -#define clamp(val, lo, hi) min((typeof(val))max(val, lo), hi) - -/* - * ..and if you can't take the strict - * types, you can specify one yourself. - * - * Or not use min/max/clamp at all, of course. - */ - -/** - * min_t - return minimum of two values, using the specified type - * @type: data type to use - * @x: first value - * @y: second value - */ -#define min_t(type, x, y) __careful_cmp((type)(x), (type)(y), <) - -/** - * max_t - return maximum of two values, using the specified type - * @type: data type to use - * @x: first value - * @y: second value - */ -#define max_t(type, x, y) __careful_cmp((type)(x), (type)(y), >) - -/** - * clamp_t - return a value clamped to a given range using a given type - * @type: the type of variable to use - * @val: current value - * @lo: minimum allowable value - * @hi: maximum allowable value - * - * This macro does no typechecking and uses temporary variables of type - * @type to make all the comparisons. - */ -#define clamp_t(type, val, lo, hi) min_t(type, max_t(type, val, lo), hi) - -/** - * clamp_val - return a value clamped to a given range using val's type - * @val: current value - * @lo: minimum allowable value - * @hi: maximum allowable value - * - * This macro does no typechecking and uses temporary variables of whatever - * type the input argument @val is. This is useful when @val is an unsigned - * type and @lo and @hi are literals that will otherwise be assigned a signed - * integer type. - */ -#define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi) - - -/** - * swap - swap values of @a and @b - * @a: first value - * @b: second value - */ -#define swap(a, b) \ - do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) - /* This counts to 12. Any more, it will return 13th argument. */ #define __COUNT_ARGS(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _n, X...) _n #define COUNT_ARGS(X...) __COUNT_ARGS(, ##X, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) |