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# _SC_LEVEL2_CACHE_LINESIZE is most probably Glibc specific define. Hence we
# cannot use it with other libc's. Check if _SC_LEVEL2_CACHE_LINESIZE is
# available or use custom function to get CPU cache size
# Original patch was found here [1]
# [1]: https://cgit.openembedded.org/meta-openembedded/plain/meta-oe/recipes-benchmark/libhugetlbfs/files/0003-alloc.c-Avoid-sysconf-_SC_LEVEL2_CACHE_LINESIZE-on-l.patch
# Closes: https://bugs.gentoo.org/828830
--- a/alloc.c
+++ b/alloc.c
@@ -245,6 +245,24 @@ void free_huge_pages(void *ptr)
__free_huge_pages(ptr, 1);
}
+/*
+ * Avoid sysconf(_SC_LEVEL2_CACHE_LINESIZE) on linux
+ * Taken from the folling patch [1]
+ *
+ * [1]: https://cgit.openembedded.org/meta-openembedded/plain/meta-oe/recipes-benchmark/libhugetlbfs/files/0003-alloc.c-Avoid-sysconf-_SC_LEVEL2_CACHE_LINESIZE-on-l.patch
+ */
+#if !defined(_SC_LEVEL2_CACHE_LINESIZE)
+static size_t get_cacheline_size() {
+ FILE * fp = fopen("/sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size", "r");
+ unsigned int line_size = 0;
+ if (fp) {
+ fscanf(fp, "%d", &line_size);
+ fclose(fp);
+ }
+ return line_size;
+}
+#endif
+
/*
* Offset the buffer using bytes wasted due to alignment to avoid using the
* same cache lines for the start of every buffer returned by
@@ -261,7 +279,11 @@ void *cachecolor(void *buf, size_t len, size_t color_bytes)
/* Lookup our cacheline size once */
if (cacheline_size == 0) {
+#if defined(_SC_LEVEL2_CACHE_LINESIZE)
cacheline_size = sysconf(_SC_LEVEL2_CACHE_LINESIZE);
+#else
+ cacheline_size = get_cacheline_size();
+#endif
linemod = time(NULL);
}
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