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sched: Change task_struct::state

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Change the type and name of task_struct::state. Drop the volatile and
shrink it to an 'unsigned int'. Rename it in order to find all uses
such that we can use READ_ONCE/WRITE_ONCE as appropriate.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Acked-by: Will Deacon <will@kernel.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20210611082838.550736351@infradead.org
This commit is contained in:
Peter Zijlstra
2021-06-11 10:28:17 +02:00
parent 7c3edd6d9c
commit 2f064a59a1
28 changed files with 123 additions and 111 deletions
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18
kernel/debug/kdb/kdb_support.c
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@@ -609,23 +609,25 @@ unsigned long kdb_task_state_string(const char *s)
*/
char kdb_task_state_char (const struct task_struct *p)
{
int cpu;
char state;
unsigned int p_state;
unsigned long tmp;
char state;
int cpu;
if (!p ||
copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long)))
return 'E';
cpu = kdb_process_cpu(p);
state = (p->state == 0) ? 'R' :
(p->state < 0) ? 'U' :
(p->state & TASK_UNINTERRUPTIBLE) ? 'D' :
(p->state & TASK_STOPPED) ? 'T' :
(p->state & TASK_TRACED) ? 'C' :
p_state = READ_ONCE(p->__state);
state = (p_state == 0) ? 'R' :
(p_state < 0) ? 'U' :
(p_state & TASK_UNINTERRUPTIBLE) ? 'D' :
(p_state & TASK_STOPPED) ? 'T' :
(p_state & TASK_TRACED) ? 'C' :
(p->exit_state & EXIT_ZOMBIE) ? 'Z' :
(p->exit_state & EXIT_DEAD) ? 'E' :
(p->state & TASK_INTERRUPTIBLE) ? 'S' : '?';
(p_state & TASK_INTERRUPTIBLE) ? 'S' : '?';
if (is_idle_task(p)) {
/* Idle task. Is it really idle, apart from the kdb
* interrupt? */