linux-stable.git/tools/testing/selftests/futex, branch linux-5.17.y

selftests: futex: Use variable MAKE instead of make

2022-01-27T23:29:23+00:00

Recursive make commands should always use the variable MAKE, not the
explicit command name ‘make’. This has benefits and removes the
following warning when multiple jobs are used for the build:

make[2]: warning: jobserver unavailable: using -j1.  Add '+' to parent make rule.

Fixes: a8ba798bc8ec ("selftests: enable O and KBUILD_OUTPUT")
Signed-off-by: Muhammad Usama Anjum 
Reviewed-by: André Almeida 
Signed-off-by: Shuah Khan

selftests: futex: Test sys_futex_waitv() wouldblock

2021-10-07T11:51:12+00:00

Test if futex_waitv() returns -EWOULDBLOCK correctly when the expected
value is different from the actual value for a waiter.

Signed-off-by: André Almeida 
Signed-off-by: Peter Zijlstra (Intel) 
Link: https://lore.kernel.org/r/20210923171111.300673-22-andrealmeid@collabora.com

selftests: futex: Test sys_futex_waitv() timeout

2021-10-07T11:51:12+00:00

Test if the futex_waitv timeout is working as expected, using the
supported clockid options.

Signed-off-by: André Almeida 
Signed-off-by: Peter Zijlstra (Intel) 
Link: https://lore.kernel.org/r/20210923171111.300673-21-andrealmeid@collabora.com

selftests: futex: Add sys_futex_waitv() test

2021-10-07T11:51:12+00:00

Create a new file to test the waitv mechanism. Test both private and
shared futexes. Wake the last futex in the array, and check if the
return value from futex_waitv() is the right index.

Signed-off-by: André Almeida 
Signed-off-by: Peter Zijlstra (Intel) 
Link: https://lore.kernel.org/r/20210923171111.300673-20-andrealmeid@collabora.com

selftests: futex: Add futex compare requeue test

2021-06-22T09:20:16+00:00

Add testing for futex_cmp_requeue(). The first test just requeues from one
waiter to another one, and wakes it. The second performs both wake and
requeue, and checks the return values to see if the operation woke/requeued
the expected number of waiters.

Signed-off-by: André Almeida 
Signed-off-by: Thomas Gleixner 
Acked-by: Davidlohr Bueso 
Link: https://lore.kernel.org/r/20210531165036.41468-3-andrealmeid@collabora.com

selftests: futex: Add futex wait test

2021-06-22T09:20:15+00:00

There are three different strategies to uniquely identify a futex in the
kernel:

 - Private futexes: uses the pointer to mm_struct and the page address

 - Shared futexes: checks if the page containing the address is a PageAnon:
   - If it is, uses the same data as a private futexes
   - If it isn't, uses an inode sequence number from struct inode and
      the page's index

Create a selftest to check those three paths and basic wait/wake
mechanism.

Signed-off-by: André Almeida 
Signed-off-by: Thomas Gleixner 
Acked-by: Davidlohr Bueso 
Link: https://lore.kernel.org/r/20210531165036.41468-2-andrealmeid@collabora.com

selftests: futex: Expand timeout test

2021-05-12T18:44:59+00:00

Improve futex timeout testing by checking all the operations that
supports timeout and their available modes.

Signed-off-by: André Almeida 
Signed-off-by: Ingo Molnar 
Link: https://lore.kernel.org/r/20210427135328.11013-3-andrealmeid@collabora.com

selftests: futex: Correctly include headers dirs

2021-05-12T18:44:58+00:00

When building selftests, the build system will install uapi linux
headers at usr/include in kernel source's root directory. When building
with a different output folder, the headers will be installed at
kselftests/usr/include.

Add both paths so we can build the tests using up-to-date headers.

Currently, this is uncommon to happen since it's rare to find a
build system with an outdated futex header, but it happens
when testing new futex operations.

Signed-off-by: André Almeida 
Signed-off-by: Ingo Molnar 
Link: https://lore.kernel.org/r/20210427135328.11013-2-andrealmeid@collabora.com

.gitignore: add SPDX License Identifier

2020-03-25T10:50:48+00:00

Add SPDX License Identifier to all .gitignore files.

Signed-off-by: Masahiro Yamada 
Signed-off-by: Greg Kroah-Hartman

selftests: use LDLIBS for libraries instead of LDFLAGS

2020-02-13T20:14:34+00:00

While building selftests, the following errors were observed:
> tools/testing/selftests/timens'
> gcc -Wall -Werror -pthread  -lrt -ldl  timens.c  -o tools/testing/selftests/timens/timens
> /usr/bin/ld: /tmp/ccGy5CST.o: in function `check_config_posix_timers':
> timens.c:(.text+0x65a): undefined reference to `timer_create'
> collect2: error: ld returned 1 exit status

Quoting commit 870f193d48c2 ("selftests: net: use LDLIBS instead of
LDFLAGS"):

The default Makefile rule looks like:

$(CC) $(CFLAGS) $(LDFLAGS) $@ $^ $(LDLIBS)

When linking is done by gcc itself, no issue, but when it needs to be passed
to proper ld, only LDLIBS follows and then ld cannot know what libs to link
with.

More detail:
https://www.gnu.org/software/make/manual/html_node/Implicit-Variables.html

LDFLAGS
Extra flags to give to compilers when they are supposed to invoke the linker,
‘ld’, such as -L. Libraries (-lfoo) should be added to the LDLIBS variable
instead.

LDLIBS
Library flags or names given to compilers when they are supposed to invoke the
linker, ‘ld’. LOADLIBES is a deprecated (but still supported) alternative to
LDLIBS. Non-library linker flags, such as -L, should go in the LDFLAGS
variable.

While at here, correct other selftests, not only timens ones.

Reported-by: Shuah Khan 
Signed-off-by: Dmitry Safonov 
Tested-by: Shuah Khan 
Signed-off-by: Shuah Khan