1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #include "cacheline.h" |
3 | #include <unistd.h> |
4 | |
5 | #ifdef _SC_LEVEL1_DCACHE_LINESIZE |
6 | #define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE) |
7 | #else |
8 | #include <api/fs/fs.h> |
9 | #include "debug.h" |
10 | static void cache_line_size(int *cacheline_sizep) |
11 | { |
12 | if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size" , cacheline_sizep)) |
13 | pr_debug("cannot determine cache line size" ); |
14 | } |
15 | #endif |
16 | |
17 | int cacheline_size(void) |
18 | { |
19 | static int size; |
20 | |
21 | if (!size) |
22 | cache_line_size(cacheline_sizep: &size); |
23 | |
24 | return size; |
25 | } |
26 | |