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x86/timer: Don't inline __const_udelay()
author
Andi Kleen
<ak@linux.intel.com>
Sat, 30 Mar 2019 00:47:38 +0000
(17:47 -0700)
committer
Thomas Gleixner
<tglx@linutronix.de>
Fri, 19 Apr 2019 15:49:47 +0000
(17:49 +0200)
LTO will happily inline __const_udelay() everywhere it is used. Forcing it
noinline saves ~44k text in a LTO build.
13999560
1740864
1499136
17239560
1070e08
vmlinux-with-udelay-inline
13954764
1736768
1499136
17190668
1064f0c
vmlinux-wo-udelay-inline
Even without LTO this function should never be inlined.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link:
https://lkml.kernel.org/r/20190330004743.29541-4-andi@firstfloor.org
arch/x86/lib/delay.c
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diff --git
a/arch/x86/lib/delay.c
b/arch/x86/lib/delay.c
index
f5b7f1b
..
b7375dc
100644
(file)
--- a/
arch/x86/lib/delay.c
+++ b/
arch/x86/lib/delay.c
@@
-162,7
+162,7
@@
void __delay(unsigned long loops)
}
EXPORT_SYMBOL(__delay);
-void __const_udelay(unsigned long xloops)
+
noinline
void __const_udelay(unsigned long xloops)
{
unsigned long lpj = this_cpu_read(cpu_info.loops_per_jiffy) ? : loops_per_jiffy;
int d0;