percpu alloc: Introduce stride parameter

[librseq.git] / src / rseq-utils.h

diff --git a/src/rseq-utils.h b/src/rseq-utils.h
index 8ff0b6b603dc5eaecb91cb4709d3597e38ddf408..f6749d3c24e3da32820dca1cfc07b52d4d6a05d7 100644 (file)
--- a/src/rseq-utils.h
+++ b/src/rseq-utils.h
@@ -100,13 +100,13 @@ int rseq_get_count_order_ulong(unsigned long x)
 #define RSEQ_DEFAULT_PAGE_SIZE 4096
 
 static inline
-long rseq_get_page_len(void)
+unsigned long rseq_get_page_len(void)
 {
        long page_len = sysconf(_SC_PAGE_SIZE);
 
        if (page_len < 0)
                page_len = RSEQ_DEFAULT_PAGE_SIZE;
-       return page_len;
+       return (unsigned long) page_len;
 }
 
 static inline
@@ -115,4 +115,20 @@ int rseq_hweight_ulong(unsigned long v)
        return __builtin_popcountl(v);
 }
 
+static inline
+bool is_pow2(uint64_t x)
+{
+       return !(x & (x - 1));
+}
+
+/*
+ * Calculate offset needed to align p on alignment towards higher
+ * addresses. Alignment must be a power of 2
+ */
+static inline
+off_t offset_align(uintptr_t p, size_t alignment)
+{
+       return (alignment - p) & (alignment - 1);
+}
+
 #endif /* _RSEQ_UTILS_H */