From v6.4, class_create() does not have module *
See commit 11ba11 :
> driver core: class: remove module * from class_create()
>
> The module pointer in class_create() never actually did anything,
> and it shouldn't have been requred to be set as a parameter even
> if it did something. So just remove it and fix up all callers of the
> function in the kernel tree at the same time.
This patch introduces static key technique and adds a kernel module
to demostrate how to use static key to optimize an almost unlikely
branch, the module can interact with userspace thru a character device.
Signed-off-by: Peter Lin <peterlin@qilai.dev>
Since the commit b8780c363d80 ("sched: remove sleep_on() and friends
"), the description about sleep_on is incorrect and the example code has
been fixed by replacing it with wait_event family. Let's also fix the
description to match the corrected code.
Since v5.17-rc1, particularly after the commit cead1855266 ("exit:
Rename complete_and_exit to kthread_complete_and_exit"),
complete_and_exit() is renamed to kthread_complete_and_exit().
Close#188
The rule of thumb is to include the headers we are the direct user of.
In particular, if we need an atomic API, we include <linux/atomic.h>.
On the other hand we should not use headers for no reason. In particular,
if we are not doing any IRQ job, why is the <linux/irq.h> included?
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
platform_driver_register() macro already does the correct assignment for
the owner of the driver.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Since sys_open is deprecated and some architectures don't support it.
We switch the implementation to sys_openat.
Moreover, in some architectures like x86-64, the prototype of syscall,
for example, openat(), might have been changed to struct pt_regs [1]
but we cannot promise that so support the two types
(sys_openat and pt_regs).
Also, to prevent other untraced tasks print out the information, add
the uid checking in our_sys_openat().
[1] https://lore.kernel.org/lkml/20180405095307.3730-1-linux@dominikbrodowski.net/Close#159
