linux-kernel - [PATCH v8 08/10] lib: math_kunit: Add tests for new rounding related macros

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Date: Fri, 17 May 2024 23:07:26 +0530
From: Devarsh Thakkar <devarsht@...com>
To: <devarsht@...com>, <mchehab@...nel.org>, <hverkuil-cisco@...all.nl>,
        <linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <benjamin.gaignard@...labora.com>, <sebastian.fricke@...labora.com>,
        <akpm@...ux-foundation.org>, <gregkh@...uxfoundation.org>,
        <andriy.shevchenko@...ux.intel.com>, <adobriyan@...il.com>,
        <jani.nikula@...el.com>, <p.zabel@...gutronix.de>, <airlied@...il.com>,
        <daniel@...ll.ch>, <dri-devel@...ts.freedesktop.org>
CC: <laurent.pinchart@...asonboard.com>, <praneeth@...com>, <nm@...com>,
        <vigneshr@...com>, <a-bhatia1@...com>, <j-luthra@...com>,
        <b-brnich@...com>, <detheridge@...com>, <p-mantena@...com>,
        <vijayp@...com>, <andrzej.p@...labora.com>, <nicolas@...fresne.ca>,
        <davidgow@...gle.com>, <dlatypov@...gle.com>
Subject: [PATCH v8 08/10] lib: math_kunit: Add tests for new rounding related macros

Add tests for round_closest_up/down and roundclosest macros which round
to nearest multiple of specified argument. These are tested with kunit
tool as shared here [1].

[1]: https://gist.github.com/devarsht/3f9042825be3da4e133b8f4eda067876

Signed-off-by: Devarsh Thakkar <devarsht@...com>
---
V1->V8 (No change, patch introduced in V8)
---
 lib/math/math_kunit.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/lib/math/math_kunit.c b/lib/math/math_kunit.c
index 1b00e4195a1a..1955dcd5655d 100644
--- a/lib/math/math_kunit.c
+++ b/lib/math/math_kunit.c
@@ -68,6 +68,26 @@ static void round_down_test(struct kunit *test)
 	KUNIT_EXPECT_EQ(test, round_down((1 << 30) - 1, 1 << 29), 1 << 29);
 }
 
+static void round_closest_up_test(struct kunit *test)
+{
+	KUNIT_EXPECT_EQ(test, round_closest_up(17, 4), 16);
+	KUNIT_EXPECT_EQ(test, round_closest_up(15, 4), 16);
+	KUNIT_EXPECT_EQ(test, round_closest_up(14, 4), 16);
+	KUNIT_EXPECT_EQ(test, round_closest_up((1 << 30) - 1, 1 << 30), 1 << 30);
+	KUNIT_EXPECT_EQ(test, round_closest_up((1 << 30) + 1, 1 << 30), 1 << 30);
+	KUNIT_EXPECT_EQ(test, round_closest_up((1 << 30) - 1, 2), 1 << 30);
+}
+
+static void round_closest_down_test(struct kunit *test)
+{
+	KUNIT_EXPECT_EQ(test, round_closest_down(17, 4), 16);
+	KUNIT_EXPECT_EQ(test, round_closest_down(15, 4), 16);
+	KUNIT_EXPECT_EQ(test, round_closest_down(14, 4), 12);
+	KUNIT_EXPECT_EQ(test, round_closest_down((1 << 30) - 1, 1 << 30), 1 << 30);
+	KUNIT_EXPECT_EQ(test, round_closest_down((1 << 30) + 1, 1 << 30), 1 << 30);
+	KUNIT_EXPECT_EQ(test, round_closest_down((1 << 30) - 1, 2), (1 << 30) - 2);
+}
+
 /* These versions can round to numbers that aren't a power of two */
 static void roundup_test(struct kunit *test)
 {
@@ -93,6 +113,18 @@ static void rounddown_test(struct kunit *test)
 	KUNIT_EXPECT_EQ(test, rounddown(4, 3), 3);
 }
 
+static void roundclosest_test(struct kunit *test)
+{
+	KUNIT_EXPECT_EQ(test, roundclosest(21, 5), 20);
+	KUNIT_EXPECT_EQ(test, roundclosest(19, 5), 20);
+	KUNIT_EXPECT_EQ(test, roundclosest(17, 5), 15);
+	KUNIT_EXPECT_EQ(test, roundclosest((1 << 30), 3), (1 << 30) - 1);
+	KUNIT_EXPECT_EQ(test, roundclosest((1 << 30) - 1, 1 << 29), 1 << 30);
+
+	KUNIT_EXPECT_EQ(test, roundclosest(4, 3), 3);
+	KUNIT_EXPECT_EQ(test, roundclosest(5, 3), 6);
+}
+
 static void div_round_up_test(struct kunit *test)
 {
 	KUNIT_EXPECT_EQ(test, DIV_ROUND_UP(0, 1), 0);
@@ -270,8 +302,11 @@ static struct kunit_case math_test_cases[] = {
 	KUNIT_CASE(int_sqrt_test),
 	KUNIT_CASE(round_up_test),
 	KUNIT_CASE(round_down_test),
+	KUNIT_CASE(round_closest_up_test),
+	KUNIT_CASE(round_closest_down_test),
 	KUNIT_CASE(roundup_test),
 	KUNIT_CASE(rounddown_test),
+	KUNIT_CASE(roundclosest_test),
 	KUNIT_CASE(div_round_up_test),
 	KUNIT_CASE(div_round_closest_test),
 	KUNIT_CASE_PARAM(gcd_test, gcd_gen_params),
-- 
2.39.1