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amd64: stop nesting preemption counter in spinlock_enter

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Discussed with:	jhb
This commit is contained in:
Mateusz Guzik 2017-11-12 03:13:01 +00:00
parent fe7979a12c
commit ca0227933e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=325734
1 changed files with 4 additions and 3 deletions
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7
sys/amd64/amd64/machdep.c
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@ -1853,9 +1853,9 @@ spinlock_enter(void)
flags = intr_disable();
td->td_md.md_spinlock_count = 1;
td->td_md.md_saved_flags = flags;
critical_enter();
} else
td->td_md.md_spinlock_count++;
critical_enter();
}
void
@ -1865,11 +1865,12 @@ spinlock_exit(void)
register_t flags;
td = curthread;
critical_exit();
flags = td->td_md.md_saved_flags;
td->td_md.md_spinlock_count--;
if (td->td_md.md_spinlock_count == 0)
if (td->td_md.md_spinlock_count == 0) {
critical_exit();
intr_restore(flags);
}
}
/*