[RFC PATCH v1 8/8] selftests/nolibc: Add `getpagesize(2)` selftest

From: Ammar Faizi <ammarfaizi2@gnuweeb.org>
To: Willy Tarreau <w@1wt.eu>, Shuah Khan <shuah@kernel.org>,
	"Paul E. McKenney" <paulmck@kernel.org>
Cc: Ammar Faizi <ammarfaizi2@gnuweeb.org>,
	Gilang Fachrezy <gilang4321@gmail.com>,
	VNLX Kernel Department <kernel@vnlx.org>,
	Alviro Iskandar Setiawan <alviro.iskandar@gnuweeb.org>,
	Kanna Scarlet <knscarlet@gnuweeb.org>,
	Muhammad Rizki <kiizuha@gnuweeb.org>,
	GNU/Weeb Mailing List <gwml@vger.gnuweeb.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux Kselftest Mailing List  <linux-kselftest@vger.kernel.org>
Subject: [RFC PATCH v1 8/8] selftests/nolibc: Add `getpagesize(2)` selftest
Date: Thu, 22 Dec 2022 10:51:34 +0700	[thread overview]
Message-ID: <20221222035134.3467659-9-ammar.faizi@intel.com> (raw)
In-Reply-To: <20221222035134.3467659-1-ammar.faizi@intel.com>

From: Ammar Faizi <ammarfaizi2@gnuweeb.org>

Test the getpagesize() function. Make sure it returns the correct
value.

Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
---
 tools/testing/selftests/nolibc/nolibc-test.c | 31 ++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index a65cc6b83779..19b3ed5f2356 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -625,6 +625,36 @@ static int should_test_signal(void)
 	return should_test_sigaction();
 }
 
+static int test_getpagesize(void)
+{
+	long x = getpagesize();
+	int c;
+
+	if (x < 0)
+		return x;
+
+#if defined(__x86_64__) || defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__)
+	/*
+	 * x86 family is always 4K page.
+	 */
+	c = (x == 4096);
+#elif defined(__aarch64__)
+	/*
+	 * Linux aarch64 supports three values of page size: 4K, 16K, and 64K
+	 * which are selected at kernel compilation time.
+	 */
+	c = (x == 4096 || x == (16 * 1024) || x == (64 * 1024));
+#else
+	/*
+	 * Assuming other architectures must have at
+	 * least 4K page.
+	 */
+	c = (x >= 4096);
+#endif
+
+	return !c;
+}
+
 /* Run syscall tests between IDs <min> and <max>.
  * Return 0 on success, non-zero on failure.
  */
@@ -686,6 +716,7 @@ int run_syscall(int min, int max)
 		CASE_TEST(gettimeofday_bad2); EXPECT_SYSER(1, gettimeofday(NULL, (void *)1), -1, EFAULT); break;
 		CASE_TEST(gettimeofday_bad2); EXPECT_SYSER(1, gettimeofday(NULL, (void *)1), -1, EFAULT); break;
 #endif
+		CASE_TEST(getpagesize);       EXPECT_SYSZR(1, test_getpagesize()); break;
 		CASE_TEST(ioctl_tiocinq);     EXPECT_SYSZR(1, ioctl(0, TIOCINQ, &tmp)); break;
 		CASE_TEST(ioctl_tiocinq);     EXPECT_SYSZR(1, ioctl(0, TIOCINQ, &tmp)); break;
 		CASE_TEST(link_root1);        EXPECT_SYSER(1, link("/", "/"), -1, EEXIST); break;
-- 
Ammar Faizi

