[PATCH 1/2] mtd-utils: flash_speed: Rework the time counting helpers

[Miquel Raynal]

In order to be able to have interleaved measures, let's not use the
start and finish global variables from the time helpers directly,
provide parameters for these variables so that we can provide either the
global entries, or more specific ones when relevant.

Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
---
 tests/mtd-tests/flash_speed.c | 39 +++++++++++++++++++++--------------
 1 file changed, 23 insertions(+), 16 deletions(-)

diff --git a/tests/mtd-tests/flash_speed.c b/tests/mtd-tests/flash_speed.c
index 2fc70a1..035768b 100644
--- a/tests/mtd-tests/flash_speed.c
+++ b/tests/mtd-tests/flash_speed.c
@@ -258,22 +258,29 @@ static int read_eraseblock_by_2pages(int ebnum)
 	return err;
 }
 
-static void start_timing(void)
+static void start_timing(struct timespec *start)
 {
-	clock_gettime(CLOCK_MONOTONIC_RAW, &start);
+	clock_gettime(CLOCK_MONOTONIC_RAW, start);
 }
 
-static void stop_timing(void)
+static void stop_timing(struct timespec *finish)
 {
-	clock_gettime(CLOCK_MONOTONIC_RAW, &finish);
+	clock_gettime(CLOCK_MONOTONIC_RAW, finish);
 }
 
-static long calc_speed(void)
+static long calc_duration(struct timespec *start, struct timespec *finish)
 {
 	long ms;
 
-	ms = (finish.tv_sec - start.tv_sec) * 1000L;
-	ms += (finish.tv_nsec - start.tv_nsec) / 1000000L;
+	ms = (finish->tv_sec - start->tv_sec) * 1000L;
+	ms += (finish->tv_nsec - start->tv_nsec) / 1000000L;
+
+	return ms;
+}
+
+static long calc_speed(struct timespec *start, struct timespec *finish)
+{
+	long ms = calc_duration(start, finish);
 
 	if (ms <= 0)
 		return 0;
@@ -314,7 +321,7 @@ static int erase_good_eraseblocks(unsigned int eb, int ebcnt, int ebskip)
 }
 
 #define TIME_OP_PER_PEB( op )\
-		start_timing();\
+		start_timing(&start);\
 		for (i = 0; i < count; ++i) {\
 			if (bbt[i])\
 				continue;\
@@ -322,8 +329,8 @@ static int erase_good_eraseblocks(unsigned int eb, int ebcnt, int ebskip)
 			if (err)\
 				goto out;\
 		}\
-		stop_timing();\
-		speed = calc_speed()
+		stop_timing(&finish);\
+		speed = calc_speed(&start, &finish)
 
 int main(int argc, char **argv)
 {
@@ -428,12 +435,12 @@ int main(int argc, char **argv)
 	/* Erase all eraseblocks */
 	if (flags & DESTRUCTIVE) {
 		puts("Testing erase speed");
-		start_timing();
+		start_timing(&start);
 		err = erase_good_eraseblocks(peb, count, skip);
 		if (err)
 			goto out;
-		stop_timing();
-		speed = calc_speed();
+		stop_timing(&finish);
+		speed = calc_speed(&start, &finish);
 		printf("erase speed is %ld KiB/s\n", speed);
 	}
 
@@ -442,7 +449,7 @@ int main(int argc, char **argv)
 		for (k = 1; k < 7; ++k) {
 			blocks = 1 << k;
 			printf("Testing %dx multi-block erase speed\n", blocks);
-			start_timing();
+			start_timing(&start);
 			for (i = 0; i < count; ) {
 				for (j = 0; j < blocks && (i + j) < count; ++j)
 					if (bbt[i + j])
@@ -456,8 +463,8 @@ int main(int argc, char **argv)
 					goto out;
 				i += j;
 			}
-			stop_timing();
-			speed = calc_speed();
+			stop_timing(&finish);
+			speed = calc_speed(&start, &finish);
 			printf("%dx multi-block erase speed is %ld KiB/s\n",
 					blocks, speed);
 		}
-- 
2.34.1