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x86/delay: Preparatory code cleanup

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The naming conventions in the delay code are confusing at best.

All delay variants use a loops argument and or variable which originates
from the original delay_loop() implementation. But all variants except
delay_loop() are based on TSC cycles.

Rename the argument to cycles and make it type u64 to avoid these weird
expansions to u64 in the functions.

Rename MWAITX_MAX_LOOPS to MWAITX_MAX_WAIT_CYCLES for the same reason
and fixup the comment of delay_mwaitx() as well.

Mark the delay_fn function pointer __ro_after_init and fixup the comment
for it.

No functional change and preparation for the upcoming TPAUSE based delay
variant.

[ Kyung Min Park: Added __init to use_tsc_delay() ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Kyung Min Park <kyung.min.park@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/1587757076-30337-2-git-send-email-kyung.min.park@intel.com
This commit is contained in:
Thomas Gleixner
2020-04-24 12:37:54 -07:00
parent 3c40cdb0e9
commit e882489024
3 changed files with 27 additions and 23 deletions
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3
arch/x86/include/asm/delay.h
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@@ -3,8 +3,9 @@
#define _ASM_X86_DELAY_H
#include <asm-generic/delay.h>
#include <linux/init.h>
void use_tsc_delay(void);
void __init use_tsc_delay(void);
void use_mwaitx_delay(void);
#endif /* _ASM_X86_DELAY_H */