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Andrei Vagin 9c71a2e8a7 posix-clocks: Introduce clock_get_ktime() callback
The callsite in common_timer_get() has already a comment:
    /*
     * The timespec64 based conversion is suboptimal, but it's not
     * worth to implement yet another callback.
     */
    kc->clock_get(timr->it_clock, &ts64);
    now = timespec64_to_ktime(ts64);

The upcoming support for time namespaces requires to have access to:

 - The time in a task's time namespace for sys_clock_gettime()
 - The time in the root name space for common_timer_get()

That adds a valid reason to finally implement a separate callback which
returns the time in ktime_t format.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191112012724.250792-10-dima@arista.com
2020-01-14 12:20:51 +01:00
arch x86/vdso: Remove unused VDSO_HAS_32BIT_FALLBACK 2020-01-14 12:20:46 +01:00
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fs ns: Introduce Time Namespace 2020-01-14 12:20:48 +01:00
include time: Add timens_offsets to be used for tasks in time namespace 2020-01-14 12:20:49 +01:00
init ns: Introduce Time Namespace 2020-01-14 12:20:48 +01:00
ipc
kernel posix-clocks: Introduce clock_get_ktime() callback 2020-01-14 12:20:51 +01:00
lib lib/vdso: Mark do_hres() and do_coarse() as __always_inline 2020-01-14 12:20:48 +01:00
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MAINTAINERS ns: Introduce Time Namespace 2020-01-14 12:20:48 +01:00
Makefile Linux 5.5-rc5 2020-01-05 14:23:27 -08:00
README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.