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aarch64: disable lock debugging

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This commit is contained in:
K. Lange 2022-03-06 15:56:53 +09:00
parent 404e236a59
commit f778967edb
1 changed files with 4 additions and 0 deletions
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4
kernel/arch/aarch64/arch.c
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@ -388,7 +388,9 @@ void _spin_panic(const char * lock_name, spin_lock_t * target) {
} }
void arch_spin_lock_acquire(const char * name, spin_lock_t * target, const char * func) { void arch_spin_lock_acquire(const char * name, spin_lock_t * target, const char * func) {
#if 0
uint64_t expire = arch_perf_timer() + 5000000UL * arch_cpu_mhz(); uint64_t expire = arch_perf_timer() + 5000000UL * arch_cpu_mhz();
#endif
/* "loss of an exclusive monitor" is one of the things that causes an "event", /* "loss of an exclusive monitor" is one of the things that causes an "event",
* so we spin on wfe to try to load-acquire the latch */ * so we spin on wfe to try to load-acquire the latch */
@ -396,6 +398,7 @@ void arch_spin_lock_acquire(const char * name, spin_lock_t * target, const char
"sevl\n" /* And to avoid multiple jumps, we put the wfe first, so sevl will slide past the first one */ "sevl\n" /* And to avoid multiple jumps, we put the wfe first, so sevl will slide past the first one */
"1:\n" "1:\n"
" wfe\n" " wfe\n"
#if 0
); );
/* Yes, we can splice these assembly snippets with the clock check, this works fine. /* Yes, we can splice these assembly snippets with the clock check, this works fine.
@ -405,6 +408,7 @@ void arch_spin_lock_acquire(const char * name, spin_lock_t * target, const char
} }
asm volatile ( asm volatile (
#endif
"2:\n" "2:\n"
" ldaxr w2, [ %1 ]\n" /* Acquire exclusive monitor and load latch value */ " ldaxr w2, [ %1 ]\n" /* Acquire exclusive monitor and load latch value */
" cbnz w2, 1b\n" /* If the latch value isn't 0, someone else owns the lock, go back to wfe and wait for them to release it */ " cbnz w2, 1b\n" /* If the latch value isn't 0, someone else owns the lock, go back to wfe and wait for them to release it */