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s390/guarded storage: simplify task exit handling 

Free data structures required for guarded storage from
arch_release_task_struct(). This allows to simplify the code a bit,
and also makes the semantics a bit easier: arch_release_task_struct()
is never called from the task that is being removed.

In addition this allows to get rid of exit_thread() in a later patch.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2017-09-11 11:24:23 +02:00 committed by Martin Schwidefsky
parent 5ef2d5231d
commit 7b83c6297d
3 changed files with 6 additions and 10 deletions
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4
arch/s390/include/asm/processor.h
View File

@ -220,8 +220,8 @@ void show_cacheinfo(struct seq_file *m);
/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *tsk) { }
/* Free guarded storage control block for current */
void exit_thread_gs(void);
/* Free guarded storage control block */
void guarded_storage_release(struct task_struct *tsk);
unsigned long get_wchan(struct task_struct *p);
#define task_pt_regs(tsk) ((struct pt_regs *) \

9
arch/s390/kernel/guarded_storage.c
View File

@ -11,13 +11,10 @@
#include <asm/guarded_storage.h>
#include "entry.h"
void exit_thread_gs(void)
void guarded_storage_release(struct task_struct *tsk)
{
preempt_disable();
kfree(current->thread.gs_cb);
kfree(current->thread.gs_bc_cb);
current->thread.gs_cb = current->thread.gs_bc_cb = NULL;
preempt_enable();
kfree(tsk->thread.gs_cb);
kfree(tsk->thread.gs_bc_cb);
}
static int gs_enable(void)

3
arch/s390/kernel/process.c
View File

@ -48,8 +48,6 @@ extern void kernel_thread_starter(void);
*/
void exit_thread(struct task_struct *tsk)
{
if (tsk == current)
exit_thread_gs();
}
void flush_thread(void)
@ -59,6 +57,7 @@ void flush_thread(void)
void arch_release_task_struct(struct task_struct *tsk)
{
runtime_instr_release(tsk);
guarded_storage_release(tsk);
}
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)