linux-kernel - [tip:x86/urgent] x86/tsc: Force inlining of cyc2ns bits

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Message-ID: <tip-4907c68abd3f60f650f98d5a69d4ec77c0bde44f@git.kernel.org>
Date:   Sun, 14 Oct 2018 02:15:54 -0700
From:   tip-bot for Peter Zijlstra <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, hpa@...or.com, linux-kernel@...r.kernel.org,
        peterz@...radead.org, edumazet@...gle.com, mingo@...nel.org
Subject: [tip:x86/urgent] x86/tsc: Force inlining of cyc2ns bits

Commit-ID:  4907c68abd3f60f650f98d5a69d4ec77c0bde44f
Gitweb:     https://git.kernel.org/tip/4907c68abd3f60f650f98d5a69d4ec77c0bde44f
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Thu, 11 Oct 2018 12:38:26 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sun, 14 Oct 2018 11:11:22 +0200

x86/tsc: Force inlining of cyc2ns bits

Looking at the asm for native_sched_clock() I noticed we don't inline
enough. Mostly caused by sharing code with cyc2ns_read_begin(), which
we didn't used to do. So mark all that __force_inline to make it DTRT.

Fixes: 59eaef78bfea ("x86/tsc: Remodel cyc2ns to use seqcount_latch()")
Reported-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: hpa@...or.com
Cc: eric.dumazet@...il.com
Cc: bp@...en8.de
Cc: stable@...r.kernel.org
Link: https://lkml.kernel.org/r/20181011104019.695196158@infradead.org

---
 arch/x86/kernel/tsc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index b52bd2b6cdb4..6d5dc5dabfd7 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -58,7 +58,7 @@ struct cyc2ns {
 
 static DEFINE_PER_CPU_ALIGNED(struct cyc2ns, cyc2ns);
 
-void cyc2ns_read_begin(struct cyc2ns_data *data)
+void __always_inline cyc2ns_read_begin(struct cyc2ns_data *data)
 {
 	int seq, idx;
 
@@ -75,7 +75,7 @@ void cyc2ns_read_begin(struct cyc2ns_data *data)
 	} while (unlikely(seq != this_cpu_read(cyc2ns.seq.sequence)));
 }
 
-void cyc2ns_read_end(void)
+void __always_inline cyc2ns_read_end(void)
 {
 	preempt_enable_notrace();
 }
@@ -104,7 +104,7 @@ void cyc2ns_read_end(void)
  *                      -johnstul@...ibm.com "math is hard, lets go shopping!"
  */
 
-static inline unsigned long long cycles_2_ns(unsigned long long cyc)
+static __always_inline unsigned long long cycles_2_ns(unsigned long long cyc)
 {
 	struct cyc2ns_data data;
 	unsigned long long ns;