kernel/bounds.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Generate definitions needed by the preprocessor.
   4  * This code generates raw asm output which is post-processed
   5  * to extract and format the required data.
   6  */
   7
   8 #define __GENERATING_BOUNDS_H
   9 /* Include headers that define the enum constants of interest */
  10 #include <linux/page-flags.h>
  11 #include <linux/mmzone.h>
  12 #include <linux/kbuild.h>
  13 #include <linux/log2.h>
  14 #include <linux/spinlock_types.h>
  15
  16 int main(void)
  17 {
  18         /* The enum constants to put into include/generated/bounds.h */
  19         DEFINE(NR_PAGEFLAGS, __NR_PAGEFLAGS);
  20         DEFINE(MAX_NR_ZONES, __MAX_NR_ZONES);
  21 #ifdef CONFIG_SMP
  22         DEFINE(NR_CPUS_BITS, order_base_2(CONFIG_NR_CPUS));
  23 #endif
  24         DEFINE(SPINLOCK_SIZE, sizeof(spinlock_t));
  25 #ifdef CONFIG_LRU_GEN
  26         DEFINE(LRU_GEN_WIDTH, order_base_2(MAX_NR_GENS + 1));
  27         DEFINE(__LRU_REFS_WIDTH, MAX_NR_TIERS - 2);
  28 #else
  29         DEFINE(LRU_GEN_WIDTH, 0);
  30         DEFINE(__LRU_REFS_WIDTH, 0);
  31 #endif
  32         /* End of constants */
  33
  34         return 0;
  35 }