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Date:   Mon, 17 Jul 2023 13:37:05 +0200
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Subject: [PATCH v3 2/5] lib/test_bitmap: add tests for bitmap_{set,get}_value()
From:   Alexander Potapenko <glider@google.com>
To:     glider@google.com, catalin.marinas@arm.com, will@kernel.org,
        pcc@google.com, andreyknvl@gmail.com,
        andriy.shevchenko@linux.intel.com, linux@rasmusvillemoes.dk,
        yury.norov@gmail.com
Cc:     linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        eugenis@google.com, syednwaris@gmail.com, william.gray@linaro.org
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Precedence: bulk

Add basic tests ensuring that values can be added at arbitrary positions
of the bitmap, including those spanning into the adjacent unsigned
longs.

Signed-off-by: Alexander Potapenko <glider@google.com>

---
This patch was previously called
"lib/test_bitmap: add tests for bitmap_{set,get}_value_unaligned"

v3:
 - switch to using bitmap_{set,get}_value()
 - change the expected bit pattern in test_set_get_value(),
   as the test was incorrectly assuming 0 is the LSB.
---
 lib/test_bitmap.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/lib/test_bitmap.c b/lib/test_bitmap.c
index 187f5b2db4cf1..c2ab54040c249 100644
--- a/lib/test_bitmap.c
+++ b/lib/test_bitmap.c
@@ -71,6 +71,17 @@ __check_eq_uint(const char *srcfile, unsigned int line,
 	return true;
 }
 
+static bool __init
+__check_eq_ulong(const char *srcfile, unsigned int line,
+		 const unsigned long exp_ulong, unsigned long x)
+{
+	if (exp_ulong != x) {
+		pr_err("[%s:%u] expected %lu, got %lu\n",
+			srcfile, line, exp_ulong, x);
+		return false;
+	}
+	return true;
+}
 
 static bool __init
 __check_eq_bitmap(const char *srcfile, unsigned int line,
@@ -186,6 +197,7 @@ __check_eq_str(const char *srcfile, unsigned int line,
 	})
 
 #define expect_eq_uint(...)		__expect_eq(uint, ##__VA_ARGS__)
+#define expect_eq_ulong(...)		__expect_eq(ulong, ##__VA_ARGS__)
 #define expect_eq_bitmap(...)		__expect_eq(bitmap, ##__VA_ARGS__)
 #define expect_eq_pbl(...)		__expect_eq(pbl, ##__VA_ARGS__)
 #define expect_eq_u32_array(...)	__expect_eq(u32_array, ##__VA_ARGS__)
@@ -1222,6 +1234,25 @@ static void __init test_bitmap_const_eval(void)
 	BUILD_BUG_ON(~var != ~BIT(25));
 }
 
+static void __init test_set_get_value(void)
+{
+	DECLARE_BITMAP(bitmap, BITS_PER_LONG * 2);
+	unsigned long val;
+	int i;
+
+	for (i = 0; i < BITS_PER_LONG * 2 - 7; i++) {
+		bitmap_zero(bitmap, BITS_PER_LONG * 2);
+		bitmap_set_value(bitmap, 0b10101UL, i, 5);
+		val = bitmap_get_value(bitmap, i, 5);
+		expect_eq_ulong(0b10101UL, val);
+		bitmap_set_value(bitmap, 0b101UL, i + 5, 3);
+		val = bitmap_get_value(bitmap, i + 5, 3);
+		expect_eq_ulong(0b101UL, val);
+		val = bitmap_get_value(bitmap, i, 8);
+		expect_eq_ulong(0b10110101UL, val);
+	}
+}
+
 static void __init selftest(void)
 {
 	test_zero_clear();
@@ -1249,6 +1280,8 @@ static void __init selftest(void)
 	test_for_each_clear_bitrange_from();
 	test_for_each_set_clump8();
 	test_for_each_set_bit_wrap();
+
+	test_set_get_value();
 }
 
 KSTM_MODULE_LOADERS(test_bitmap);
-- 
2.41.0.255.g8b1d071c50-goog