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Date: Tue, 7 May 2024 22:59:36 +0800
From: Wen Yang <wen.yang@...ux.dev>
To: "Bird, Tim" <Tim.Bird@...y.com>, Shuah Khan <skhan@...uxfoundation.org>,
Christian Brauner <brauner@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: SShuah Khan <shuah@...nel.org>, Andrei Vagin <avagin@...gle.com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Steven Rostedt <rostedt@...dmis.org>, Dave Young <dyoung@...hat.com>,
"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] selftests: introduce additional eventfd test coverage
On 2024/5/7 02:30, Bird, Tim wrote:
>
>
>> -----Original Message-----
>> From: Wen Yang <wen.yang@...ux.dev>
>> Add several new test cases which assert corner cases on the eventfd
>> mechanism, for example, the supplied buffer is less than 8 bytes,
>> attempting to write a value that is too large, etc.
>>
>> ./eventfd_test
>> # Starting 9 tests from 1 test cases.
>> # RUN global.eventfd01 ...
>> # OK global.eventfd01
>> ok 1 global.eventfd01
>
> These are horrible test case names. Can you please use strings which indicate
> what is being tested, that are useful to a human?
> -- Tim
>
Thank you for the review.
I will do the change and send v2 soon.
--
Best wishes,
Wen
>> # RUN global.eventfd02 ...
>> # OK global.eventfd02
>> ok 2 global.eventfd02
>> # RUN global.eventfd03 ...
>> # OK global.eventfd03
>> ok 3 global.eventfd03
>> # RUN global.eventfd04 ...
>> # OK global.eventfd04
>> ok 4 global.eventfd04
>> # RUN global.eventfd05 ...
>> # OK global.eventfd05
>> ok 5 global.eventfd05
>> # RUN global.eventfd06 ...
>> # OK global.eventfd06
>> ok 6 global.eventfd06
>> # RUN global.eventfd07 ...
>> # OK global.eventfd07
>> ok 7 global.eventfd07
>> # RUN global.eventfd08 ...
>> # OK global.eventfd08
>> ok 8 global.eventfd08
>> # RUN global.eventfd09 ...
>> # OK global.eventfd09
>> ok 9 global.eventfd09
>> # PASSED: 9 / 9 tests passed.
>> # Totals: pass:9 fail:0 xfail:0 xpass:0 skip:0 error:0
>>
>> Signed-off-by: Wen Yang <wen.yang@...ux.dev>
>> Cc: SShuah Khan <shuah@...nel.org>
>> Cc: Christian Brauner <brauner@...nel.org>
>> Cc: Andrei Vagin <avagin@...gle.com>
>> Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
>> Cc: Steven Rostedt <rostedt@...dmis.org>
>> Cc: Andrew Morton <akpm@...ux-foundation.org>
>> Cc: Dave Young <dyoung@...hat.com>
>> Cc: linux-kselftest@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org
>> ---
>> .../filesystems/eventfd/eventfd_test.c | 116 ++++++++++++++++++
>> 1 file changed, 116 insertions(+)
>>
>> diff --git a/tools/testing/selftests/filesystems/eventfd/eventfd_test.c b/tools/testing/selftests/filesystems/eventfd/eventfd_test.c
>> index f142a137526c..eeab8df5b1b5 100644
>> --- a/tools/testing/selftests/filesystems/eventfd/eventfd_test.c
>> +++ b/tools/testing/selftests/filesystems/eventfd/eventfd_test.c
>> @@ -183,4 +183,120 @@ TEST(eventfd05)
>> close(fd);
>> }
>>
>> +/*
>> + * A write(2) fails with the error EINVAL if the size of the supplied buffer
>> + * is less than 8 bytes, or if an attempt is made to write the value
>> + * 0xffffffffffffffff.
>> + */
>> +TEST(eventfd06)
>> +{
>> + uint64_t value = 1;
>> + ssize_t size;
>> + int fd;
>> +
>> + fd = sys_eventfd2(0, 0);
>> + ASSERT_GE(fd, 0);
>> +
>> + size = write(fd, &value, sizeof(int));
>> + EXPECT_EQ(size, -1);
>> + EXPECT_EQ(errno, EINVAL);
>> +
>> + value = (uint64_t)-1;
>> + size = write(fd, &value, sizeof(value));
>> + EXPECT_EQ(size, -1);
>> + EXPECT_EQ(errno, EINVAL);
>> +
>> + close(fd);
>> +}
>> +
>> +/*
>> + * A read(2) fails with the error EINVAL if the size of the supplied buffer is
>> + * less than 8 bytes.
>> + */
>> +TEST(eventfd07)
>> +{
>> + int value = 0;
>> + ssize_t size;
>> + int fd;
>> +
>> + fd = sys_eventfd2(0, 0);
>> + ASSERT_GE(fd, 0);
>> +
>> + size = write(fd, &value, sizeof(value));
>> + EXPECT_EQ(size, -1);
>> + EXPECT_EQ(errno, EINVAL);
>> +
>> + close(fd);
>> +}
>> +
>> +/*
>> + * If EFD_SEMAPHORE was not specified and the eventfd counter has a nonzero
>> + * value, then a read(2) returns 8 bytes containing that value, and the
>> + * counter's value is reset to zero.
>> + * If the eventfd counter is zero at the time of the call to read(2), then the
>> + * call fails with the error EAGAIN if the file descriptor has been made nonblocking.
>> + */
>> +TEST(eventfd08)
>> +{
>> + uint64_t value;
>> + ssize_t size;
>> + int fd;
>> + int i;
>> +
>> + fd = sys_eventfd2(0, EFD_NONBLOCK);
>> + ASSERT_GE(fd, 0);
>> +
>> + value = 1;
>> + for (i = 0; i < 10000000; i++) {
>> + size = write(fd, &value, sizeof(value));
>> + EXPECT_EQ(size, sizeof(value));
>> + }
>> +
>> + size = read(fd, &value, sizeof(value));
>> + EXPECT_EQ(size, sizeof(uint64_t));
>> + EXPECT_EQ(value, 10000000);
>> +
>> + size = read(fd, &value, sizeof(value));
>> + EXPECT_EQ(size, -1);
>> + EXPECT_EQ(errno, EAGAIN);
>> +
>> + close(fd);
>> +}
>> +
>> +/*
>> + * If EFD_SEMAPHORE was specified and the eventfd counter has a nonzero value,
>> + * then a read(2) returns 8 bytes containing the value 1, and the counter's
>> + * value is decremented by 1.
>> + * If the eventfd counter is zero at the time of the call to read(2), then the
>> + * call fails with the error EAGAIN if the file descriptor has been made nonblocking.
>> + */
>> +TEST(eventfd09)
>> +{
>> + uint64_t value;
>> + ssize_t size;
>> + int fd;
>> + int i;
>> +
>> + fd = sys_eventfd2(0, EFD_SEMAPHORE|EFD_NONBLOCK);
>> + ASSERT_GE(fd, 0);
>> +
>> + value = 1;
>> + for (i = 0; i < 10000000; i++) {
>> + size = write(fd, &value, sizeof(value));
>> + EXPECT_EQ(size, sizeof(value));
>> + }
>> +
>> + for (i = 0; i < 10000000; i++) {
>> + size = read(fd, &value, sizeof(value));
>> + EXPECT_EQ(size, sizeof(value));
>> + EXPECT_EQ(value, 1);
>> + }
>> +
>> + size = read(fd, &value, sizeof(value));
>> + EXPECT_EQ(size, -1);
>> + EXPECT_EQ(errno, EAGAIN);
>> +
>> + close(fd);
>> +}
>> +
>> TEST_HARNESS_MAIN
>> --
>> 2.25.1
>>
>
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