include/ust-helper.h

   1 /*
   2  * SPDX-License-Identifier: LGPL-2.1-only
   3  *
   4  * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  */
   6
   7 #ifndef _LTTNG_UST_HELPER_H
   8 #define _LTTNG_UST_HELPER_H
   9
  10 #include <stdlib.h>
  11
  12 #include <lttng/ust-arch.h>
  13
  14 static inline
  15 void *zmalloc(size_t len)
  16         __attribute__((always_inline));
  17 static inline
  18 void *zmalloc(size_t len)
  19 {
  20         return calloc(len, 1);
  21 }
  22
  23 #define max_t(type, x, y)                               \
  24         ({                                              \
  25                 type __max1 = (x);                      \
  26                 type __max2 = (y);                      \
  27                 __max1 > __max2 ? __max1: __max2;       \
  28         })
  29
  30 #define min_t(type, x, y)                               \
  31         ({                                              \
  32                 type __min1 = (x);                      \
  33                 type __min2 = (y);                      \
  34                 __min1 <= __min2 ? __min1: __min2;      \
  35         })
  36
  37 #define LTTNG_ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  38
  39 /*
  40  * Use of __builtin_return_address(0) sometimes seems to cause stack
  41  * corruption on 32-bit PowerPC. Disable this feature on that
  42  * architecture for now by always using the NULL value for the ip
  43  * context.
  44  */
  45 #if defined(LTTNG_UST_ARCH_PPC) && !defined(LTTNG_UST_ARCH_PPC64)
  46 #define LTTNG_UST_CALLER_IP()           NULL
  47 #else
  48 #define LTTNG_UST_CALLER_IP()           __builtin_return_address(0)
  49 #endif
  50
  51 #endif /* _LTTNG_UST_HELPER_H */