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Convert pm_runcount to int to correctly check for negative value.

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Remove uncessary check for error.

Found with:	Coverity Prevent(tm)
MFC after:	1 month
This commit is contained in:
Fabien Thomas 2010-06-05 23:05:08 +00:00
parent d66caf62a2
commit 8b85d75511
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=208861
2 changed files with 6 additions and 9 deletions
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13
sys/dev/hwpmc/hwpmc_mod.c
View file

@ -1248,7 +1248,7 @@ pmc_process_csw_in(struct thread *td)
continue;
/* increment PMC runcount */
atomic_add_rel_32(&pm->pm_runcount, 1);
atomic_add_rel_int(&pm->pm_runcount, 1);
/* configure the HWPMC we are going to use. */
pcd = pmc_ri_to_classdep(md, ri, &adjri);
@ -1387,7 +1387,7 @@ pmc_process_csw_out(struct thread *td)
pcd->pcd_stop_pmc(cpu, adjri);
/* reduce this PMC's runcount */
atomic_subtract_rel_32(&pm->pm_runcount, 1);
atomic_subtract_rel_int(&pm->pm_runcount, 1);
/*
* If this PMC is associated with this process,
@ -3252,9 +3252,6 @@ pmc_syscall_handler(struct thread *td, void *syscall_args)
}
}
if (error)
break;
/*
* Look for valid values for 'pm_flags'
*/
@ -4045,7 +4042,7 @@ pmc_process_interrupt(int cpu, struct pmc *pm, struct trapframe *tf,
("[pmc,%d] pm=%p runcount %d", __LINE__, (void *) pm,
pm->pm_runcount));
atomic_add_rel_32(&pm->pm_runcount, 1); /* hold onto PMC */
atomic_add_rel_int(&pm->pm_runcount, 1); /* hold onto PMC */
ps->ps_pmc = pm;
if ((td = curthread) && td->td_proc)
ps->ps_pid = td->td_proc->p_pid;
@ -4246,7 +4243,7 @@ pmc_process_samples(int cpu)
entrydone:
ps->ps_nsamples = 0; /* mark entry as free */
atomic_subtract_rel_32(&pm->pm_runcount, 1);
atomic_subtract_rel_int(&pm->pm_runcount, 1);
/* increment read pointer, modulo sample size */
if (++ps == psb->ps_fence)
@ -4418,7 +4415,7 @@ pmc_process_exit(void *arg __unused, struct proc *p)
mtx_pool_unlock_spin(pmc_mtxpool, pm);
}
atomic_subtract_rel_32(&pm->pm_runcount,1);
atomic_subtract_rel_int(&pm->pm_runcount,1);
KASSERT((int) pm->pm_runcount >= 0,
("[pmc,%d] runcount is %d", __LINE__, ri));

2
sys/sys/pmc.h
View file

@ -680,7 +680,7 @@ struct pmc {
enum pmc_event pm_event; /* event being measured */
uint32_t pm_flags; /* additional flags PMC_F_... */
struct pmc_owner *pm_owner; /* owner thread state */
uint32_t pm_runcount; /* #cpus currently on */
int pm_runcount; /* #cpus currently on */
enum pmc_state pm_state; /* current PMC state */
/*