netdev - [RFC v3 net-next 03/18] posix-timers: Add CLOCKID

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Message-Id: <20180307011230.24001-4-jesus.sanchez-palencia@intel.com>
Date:   Tue,  6 Mar 2018 17:12:15 -0800
From:   Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>
To:     netdev@...r.kernel.org
Cc:     jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        vinicius.gomes@...el.com, richardcochran@...il.com,
        intel-wired-lan@...ts.osuosl.org, anna-maria@...utronix.de,
        henrik@...tad.us, tglx@...utronix.de, john.stultz@...aro.org,
        levi.pearson@...man.com, edumazet@...gle.com, willemb@...gle.com,
        mlichvar@...hat.com,
        Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>
Subject: [RFC v3 net-next 03/18] posix-timers: Add CLOCKID_INVALID mask

posix-timers.h states that a clockid_t value is invalid if bits 0, 1 and
2 are all set. Add a mask that can be safely used elsewhere even if this
implicit rule's implementation is changed.

This is done in preparation for the upcoming time based transmission
patchset.

Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>
---
 include/linux/posix-timers.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index c85704fcdbd2..0ba677cc8da6 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -28,6 +28,7 @@ struct cpu_timer_list {
  *
  * A clockid is invalid if bits 2, 1, and 0 are all set.
  */
+#define CLOCKID_INVALID			GENMASK(2, 0)
 #define CPUCLOCK_PID(clock)		((pid_t) ~((clock) >> 3))
 #define CPUCLOCK_PERTHREAD(clock) \
 	(((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
-- 
2.16.2