cacheline.c 568 B

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  1. // SPDX-License-Identifier: GPL-2.0
  2. #include "cacheline.h"
  3. #include <unistd.h>
  4. #ifdef _SC_LEVEL1_DCACHE_LINESIZE
  5. #define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE)
  6. #else
  7. #include <api/fs/fs.h>
  8. #include "debug.h"
  9. static void cache_line_size(int *cacheline_sizep)
  10. {
  11. if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size", cacheline_sizep))
  12. pr_debug("cannot determine cache line size");
  13. }
  14. #endif
  15. int cacheline_size(void)
  16. {
  17. static int size;
  18. if (!size)
  19. cache_line_size(&size);
  20. return size;
  21. }