Commit-ID: bd1857948e7667313f9a7bee9b2492c0848174a6
Gitweb: http://git.kernel.org/tip/bd1857948e7667313f9a7bee9b2492c0848174a6
Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Tue, 16 Dec 2014 13:19:23 -0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 17 Dec 2014 11:58:15 -0300
tools: Adopt roundup_pow_of_two
To replace equivalent code used in the mmap_pages command line
parameter handling in tools/perf.
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Don Zickus <dzickus@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-i44zs02xt4zexfxywpklo7km@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/include/linux/log2.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/tools/include/linux/log2.h b/tools/include/linux/log2.h
index 990b138..4144666 100644
--- a/tools/include/linux/log2.h
+++ b/tools/include/linux/log2.h
@@ -48,6 +48,15 @@ bool is_power_of_2(unsigned long n)
}
/*
+ * round up to nearest power of two
+ */
+static inline __attribute__((const))
+unsigned long __roundup_pow_of_two(unsigned long n)
+{
+ return 1UL << fls_long(n - 1);
+}
+
+/*
* round down to nearest power of two
*/
static inline __attribute__((const))
@@ -141,6 +150,22 @@ unsigned long __rounddown_pow_of_two(unsigned long n)
__ilog2_u64(n) \
)
+/**
+ * roundup_pow_of_two - round the given value up to nearest power of two
+ * @n - parameter
+ *
+ * round the given value up to the nearest power of two
+ * - the result is undefined when n == 0
+ * - this can be used to initialise global variables from constant data
+ */
+#define roundup_pow_of_two(n) \
+( \
+ __builtin_constant_p(n) ? ( \
+ (n == 1) ? 1 : \
+ (1UL << (ilog2((n) - 1) + 1)) \
+ ) : \
+ __roundup_pow_of_two(n) \
+ )
/**
* rounddown_pow_of_two - round the given value down to nearest power of two
--
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