forked from Minki/linux
xtensa: fix __delay for small loop count
Avoid __delay counter underflow for loop counts < 2. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
This commit is contained in:
parent
5515daa9ca
commit
01e3b3cb2d
@ -19,9 +19,12 @@ extern unsigned long loops_per_jiffy;
|
||||
|
||||
static inline void __delay(unsigned long loops)
|
||||
{
|
||||
/* 2 cycles per loop. */
|
||||
__asm__ __volatile__ ("1: addi %0, %0, -2; bgeui %0, 2, 1b"
|
||||
: "=r" (loops) : "0" (loops));
|
||||
if (__builtin_constant_p(loops) && loops < 2)
|
||||
__asm__ __volatile__ ("nop");
|
||||
else if (loops >= 2)
|
||||
/* 2 cycles per loop. */
|
||||
__asm__ __volatile__ ("1: addi %0, %0, -2; bgeui %0, 2, 1b"
|
||||
: "+r" (loops));
|
||||
}
|
||||
|
||||
/* For SMP/NUMA systems, change boot_cpu_data to something like
|
||||
|
Loading…
Reference in New Issue
Block a user