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sched/paging: Fix error: variable 'result' set but not used

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Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
This commit is contained in:
Xiang Xiao 2020-04-30 10:00:27 +08:00 committed by patacongo
parent 1aa9ff8af2
commit 45c168c5ef
1 changed files with 60 additions and 54 deletions
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114
sched/paging/pg_worker.c
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@ -72,7 +72,8 @@ pid_t g_pgworker;
/* The page fill worker thread maintains a static variable called g_pftcb.
* If no fill is in progress, g_pftcb will be NULL. Otherwise, g_pftcb will
* point to the TCB of the task which is receiving the fill that is in progress.
* point to the TCB of the task which is receiving the fill that is in
* progress.
*
* NOTE: I think that this is the only state in which a TCB does not reside
* in some list. Here is it in limbo, outside of the normally queuing while
@ -230,23 +231,24 @@ static void pg_callback(FAR struct tcb_s *tcb, int result)
static inline bool pg_dequeue(void)
{
/* Loop until either (1) the TCB of a task that requires a fill is found, OR
* (2) the g_watingforfill list becomes empty.
/* Loop until either (1) the TCB of a task that requires a fill is found,
* OR (2) the g_watingforfill list becomes empty.
*/
do
{
/* Remove the TCB from the head of the list (if any) */
g_pftcb = (FAR struct tcb_s *)dq_remfirst((dq_queue_t *)&g_waitingforfill);
g_pftcb = (FAR struct tcb_s *)
dq_remfirst((FAR dq_queue_t *)&g_waitingforfill);
pginfo("g_pftcb: %p\n", g_pftcb);
if (g_pftcb != NULL)
{
/* Call the architecture-specific function up_checkmapping() to see if
* the page fill still needs to be performed. In certain conditions,
* the page fault may occur on several threads for the same page and
* be queues multiple times. In this corner case, the blocked task will
* simply be restarted.
/* Call the architecture-specific function up_checkmapping() to see
* if the page fill still needs to be performed. In certain
* conditions, the page fault may occur on several threads for the
* same page and be queues multiple times. In this corner case, the
* blocked task will simply be restarted.
*/
if (!up_checkmapping(g_pftcb))
@ -352,10 +354,10 @@ static inline bool pg_startfill(void)
if (pg_dequeue())
{
/* Call up_allocpage(tcb, &vpage). This architecture-specific function will
* set aside page in memory and map to virtual address (vpage). If all
* available pages are in-use (the typical case), this function will select
* a page in-use, un-map it, and make it available.
/* Call up_allocpage(tcb, &vpage). This architecture-specific function
* will set aside page in memory and map to virtual address (vpage). If
* all available pages are in-use (the typical case), this function
* will select a page in-use, un-map it, and make it available.
*/
pginfo("Call up_allocpage(%p)\n", g_pftcb);
@ -363,29 +365,30 @@ static inline bool pg_startfill(void)
DEBUGASSERT(result == OK);
/* Start the fill. The exact way that the fill is started depends upon
* the nature of the architecture-specific up_fillpage() function -- Is it
* a blocking or a non-blocking call?
* the nature of the architecture-specific up_fillpage() function -- Is
* it a blocking or a non-blocking call?
*/
#ifdef CONFIG_PAGING_BLOCKINGFILL
/* If CONFIG_PAGING_BLOCKINGFILL is defined, then up_fillpage is blocking
* call. In this case, up_fillpage() will accept only (1) a reference to
* the TCB that requires the fill. Architecture-specific context information
* within the TCB will be sufficient to perform the fill. And (2) the
* (virtual) address of the allocated page to be filled. The resulting
* status of the fill will be provided by return value from up_fillpage().
/* If CONFIG_PAGING_BLOCKINGFILL is defined, then up_fillpage is
* blocking call. In this case, up_fillpage() will accept only (1) a
* reference to the TCB that requires the fill. Architecture-specific
* context information within the TCB will be sufficient to perform the
* fill. And (2) the (virtual) address of the allocated page to be
* filled. The resulting status of the fill will be provided by return
* value from up_fillpage().
*/
pginfo("Call up_fillpage(%p)\n", g_pftcb);
result = up_fillpage(g_pftcb, vpage);
DEBUGASSERT(result == OK);
#else
/* If CONFIG_PAGING_BLOCKINGFILL is defined, then up_fillpage is non-blocking
* call. In this case up_fillpage() will accept an additional argument: The
* page fill worker thread will provide a callback function, pg_callback.
*
* Calling up_fillpage will start an asynchronous page fill. pg_callback
* ill be called when the page fill is finished (or an error occurs). This
/* If CONFIG_PAGING_BLOCKINGFILL is defined, then up_fillpage is non-
* blocking call. In this case up_fillpage() will accept an additional
* argument: The page fill worker thread will provide a callback
* function, pg_callback.
* up_fillpage will start an asynchronous page fill. pg_callback
* will be called when the page fill is finished (or an error occurs).
* This callback will probably from interrupt level.
*/
@ -393,23 +396,24 @@ static inline bool pg_startfill(void)
result = up_fillpage(g_pftcb, vpage, pg_callback);
DEBUGASSERT(result == OK);
/* Save the time that the fill was started. These will be used to check for
* timeouts.
/* Save the time that the fill was started. These will be used to
* check for timeouts.
*/
#ifdef CONFIG_PAGING_TIMEOUT_TICKS
g_starttime = clock_systimer();
#endif
/* Return and wait to be signaled for the next event -- the fill completion
* event. While the fill is in progress, other tasks may execute. If
* another page fault occurs during this time, the faulting task will be
* blocked, its TCB will be added (in priority order) to g_waitingforfill
* and the priority of the page worker task may be boosted. But no action
* will be taken until the current page fill completes. NOTE: The IDLE task
* must also be fully locked in memory. The IDLE task cannot be blocked. It
* the case where all tasks are blocked waiting for a page fill, the IDLE
* task must still be available to run.
/* Return and wait to be signaled for the next event -- the fill
* completion event. While the fill is in progress, other tasks may
* execute. If another page fault occurs during this time, the faulting
* task will be blocked, its TCB will be added (in priority order) to
* g_waitingforfill and the priority of the page worker task may be
* boosted. But no action will be taken until the current page fill
* completes. NOTE: The IDLE task must also be fully locked in memory.
* The IDLE task cannot be blocked. It the case where all tasks are
* blocked waiting for a page fill, the IDLE task must still be
* available to run.
*/
#endif /* CONFIG_PAGING_BLOCKINGFILL */
@ -418,6 +422,7 @@ static inline bool pg_startfill(void)
}
pginfo("Queue empty\n");
UNUSED(result);
return false;
}
@ -518,8 +523,8 @@ static inline void pg_fillcomplete(void)
int pg_worker(int argc, char *argv[])
{
/* Loop forever -- Notice that interrupts will be disabled at all times that
* this thread runs. That is so that we can't lose signals or have
/* Loop forever -- Notice that interrupts will be disabled at all times
* that this thread runs. That is so that we can't lose signals or have
* asynchronous page faults.
*
* All interrupt logic as well as all page fill worker thread logic must
@ -532,10 +537,10 @@ int pg_worker(int argc, char *argv[])
up_irq_save();
for (; ; )
{
/* Wait awhile. We will wait here until either the configurable timeout
* elapses or until we are awakened by a signal (which terminates the
* nxsig_usleep with an EINTR error). Note that interrupts will be re-
* enabled while this task sleeps.
/* Wait awhile. We will wait here until either the configurable
* timeout elapses or until we are awakened by a signal (which
* terminates the nxsig_usleep with an EINTR error). Note that
* interrupts will be re- enabled while this task sleeps.
*
* The timeout is a failsafe that will handle any cases where a single
* is lost (that would really be a bug and shouldn't happen!) and also
@ -544,7 +549,7 @@ int pg_worker(int argc, char *argv[])
nxsig_usleep(CONFIG_PAGING_WORKPERIOD);
/* The page fill worker thread will be awakened on one of three conditions:
/* The page fill worker thread will be awakened on one of 3 conditions:
*
* - When signaled by pg_miss(), the page fill worker thread will be
* awakened,
@ -556,15 +561,16 @@ int pg_worker(int argc, char *argv[])
*/
#ifndef CONFIG_PAGING_BLOCKINGFILL
/* For the non-blocking up_fillpage(), the page fill worker thread will detect
* that the page fill is complete when it is awakened with g_pftcb non-NULL
* and fill completion status from pg_callback.
/* For the non-blocking up_fillpage(), the page fill worker thread will
* detect that the page fill is complete when it is awakened with
* g_pftcb non-NULL and fill completion status from pg_callback.
*/
if (g_pftcb != NULL)
{
/* If it is a real page fill completion event, then the result of the page
* fill will be in g_fillresult and will not be equal to -EBUSY.
/* If it is a real page fill completion event, then the result of
* the page fill will be in g_fillresult and will not be equal to
* -EBUSY.
*/
if (g_fillresult != -EBUSY)
@ -573,8 +579,8 @@ int pg_worker(int argc, char *argv[])
DEBUGASSERT(g_fillresult == OK);
/* Handle the successful page fill complete event by restarting the
* task that was blocked waiting for this page fill.
/* Handle the successful page fill complete event by restarting
* the task that was blocked waiting for this page fill.
*/
pginfo("Restarting TCB: %p\n", g_pftcb);
@ -598,8 +604,8 @@ int pg_worker(int argc, char *argv[])
}
}
/* If a configurable timeout period expires with no page fill completion
* event, then declare a failure.
/* If a configurable timeout period expires with no page fill
* completion event, then declare a failure.
*/
#ifdef CONFIG_PAGING_TIMEOUT_TICKS