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authorHeiko Carstens <heiko.carstens@de.ibm.com>2016-11-08 13:08:26 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-11-11 18:37:41 +0300
commitd5c352cdd022d2c304c6ab19d100631356f2198c (patch)
tree602e29e76047f489c82e8264011d219943ec78f7
parentc360192bf4a8dc72f102dd6a4e1bf8bd0b404cfa (diff)
downloadlinux-d5c352cdd022d2c304c6ab19d100631356f2198c.tar.xz
s390: move thread_info into task_struct
This is the s390 variant of commit 15f4eae70d36 ("x86: Move thread_info into task_struct"). Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/Kconfig1
-rw-r--r--arch/s390/include/asm/lowcore.h2
-rw-r--r--arch/s390/include/asm/thread_info.h11
-rw-r--r--arch/s390/kernel/asm-offsets.c15
-rw-r--r--arch/s390/kernel/entry.S17
-rw-r--r--arch/s390/kernel/head64.S5
-rw-r--r--arch/s390/kernel/setup.c3
-rw-r--r--arch/s390/kernel/smp.c1
8 files changed, 19 insertions, 36 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 426481d4cc86..a159dfc27b76 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -169,6 +169,7 @@ config S390
select OLD_SIGSUSPEND3
select SPARSE_IRQ
select SYSCTL_EXCEPTION_TRACE
+ select THREAD_INFO_IN_TASK
select TTY
select VIRT_CPU_ACCOUNTING
select VIRT_TO_BUS
diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h
index 1df1e6215e85..9bfad2ad6312 100644
--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -95,7 +95,7 @@ struct lowcore {
/* Current process. */
__u64 current_task; /* 0x0310 */
- __u64 thread_info; /* 0x0318 */
+ __u8 pad_0x318[0x320-0x318]; /* 0x0318 */
__u64 kernel_stack; /* 0x0320 */
/* Interrupt, panic and restart stack. */
diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h
index 933794150e5b..ef02b1cae590 100644
--- a/arch/s390/include/asm/thread_info.h
+++ b/arch/s390/include/asm/thread_info.h
@@ -30,10 +30,8 @@
* - if the contents of this structure are changed, the assembly constants must also be changed
*/
struct thread_info {
- struct task_struct *task; /* main task structure */
unsigned long flags; /* low level flags */
unsigned long sys_call_table; /* System call table address */
- unsigned int cpu; /* current CPU */
unsigned int system_call;
__u64 user_timer;
__u64 system_timer;
@@ -45,20 +43,11 @@ struct thread_info {
*/
#define INIT_THREAD_INFO(tsk) \
{ \
- .task = &tsk, \
.flags = 0, \
- .cpu = 0, \
}
-#define init_thread_info (init_thread_union.thread_info)
#define init_stack (init_thread_union.stack)
-/* how to get the thread information struct from C */
-static inline struct thread_info *current_thread_info(void)
-{
- return (struct thread_info *) S390_lowcore.thread_info;
-}
-
void arch_release_task_struct(struct task_struct *tsk);
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index 6be10e490982..56258a484dfd 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -25,7 +25,7 @@
int main(void)
{
/* task struct offsets */
- OFFSET(__TASK_thread_info, task_struct, stack);
+ OFFSET(__TASK_stack, task_struct, stack);
OFFSET(__TASK_thread, task_struct, thread);
OFFSET(__TASK_pid, task_struct, pid);
BLANK();
@@ -39,13 +39,11 @@ int main(void)
OFFSET(__THREAD_trap_tdb, thread_struct, trap_tdb);
BLANK();
/* thread info offsets */
- OFFSET(__TI_task, thread_info, task);
- OFFSET(__TI_flags, thread_info, flags);
- OFFSET(__TI_sysc_table, thread_info, sys_call_table);
- OFFSET(__TI_cpu, thread_info, cpu);
- OFFSET(__TI_user_timer, thread_info, user_timer);
- OFFSET(__TI_system_timer, thread_info, system_timer);
- OFFSET(__TI_last_break, thread_info, last_break);
+ OFFSET(__TI_flags, task_struct, thread_info.flags);
+ OFFSET(__TI_sysc_table, task_struct, thread_info.sys_call_table);
+ OFFSET(__TI_user_timer, task_struct, thread_info.user_timer);
+ OFFSET(__TI_system_timer, task_struct, thread_info.system_timer);
+ OFFSET(__TI_last_break, task_struct, thread_info.last_break);
BLANK();
/* pt_regs offsets */
OFFSET(__PT_ARGS, pt_regs, args);
@@ -160,7 +158,6 @@ int main(void)
OFFSET(__LC_INT_CLOCK, lowcore, int_clock);
OFFSET(__LC_MCCK_CLOCK, lowcore, mcck_clock);
OFFSET(__LC_CURRENT, lowcore, current_task);
- OFFSET(__LC_THREAD_INFO, lowcore, thread_info);
OFFSET(__LC_KERNEL_STACK, lowcore, kernel_stack);
OFFSET(__LC_ASYNC_STACK, lowcore, async_stack);
OFFSET(__LC_PANIC_STACK, lowcore, panic_stack);
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 3f4a1638a700..06cc1e6f8a69 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -186,14 +186,13 @@ ENTRY(__switch_to)
stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task
lgr %r1,%r2
aghi %r1,__TASK_thread # thread_struct of prev task
- lg %r5,__TASK_thread_info(%r3) # get thread_info of next
+ lg %r5,__TASK_stack(%r3) # start of kernel stack of next
stg %r15,__THREAD_ksp(%r1) # store kernel stack of prev
lgr %r1,%r3
aghi %r1,__TASK_thread # thread_struct of next task
lgr %r15,%r5
aghi %r15,STACK_INIT # end of kernel stack of next
stg %r3,__LC_CURRENT # store task struct of next
- stg %r5,__LC_THREAD_INFO # store thread info of next
stg %r15,__LC_KERNEL_STACK # store end of kernel stack
lg %r15,__THREAD_ksp(%r1) # load kernel stack of next
/* c4 is used in guest detection: arch/s390/kernel/perf_cpum_sf.c */
@@ -274,7 +273,7 @@ ENTRY(system_call)
.Lsysc_stmg:
stmg %r8,%r15,__LC_SAVE_AREA_SYNC
lg %r10,__LC_LAST_BREAK
- lg %r12,__LC_THREAD_INFO
+ lg %r12,__LC_CURRENT
lghi %r14,_PIF_SYSCALL
.Lsysc_per:
lg %r15,__LC_KERNEL_STACK
@@ -457,7 +456,7 @@ ENTRY(system_call)
#
ENTRY(ret_from_fork)
la %r11,STACK_FRAME_OVERHEAD(%r15)
- lg %r12,__LC_THREAD_INFO
+ lg %r12,__LC_CURRENT
brasl %r14,schedule_tail
TRACE_IRQS_ON
ssm __LC_SVC_NEW_PSW # reenable interrupts
@@ -478,7 +477,7 @@ ENTRY(pgm_check_handler)
stpt __LC_SYNC_ENTER_TIMER
stmg %r8,%r15,__LC_SAVE_AREA_SYNC
lg %r10,__LC_LAST_BREAK
- lg %r12,__LC_THREAD_INFO
+ lg %r12,__LC_CURRENT
larl %r13,cleanup_critical
lmg %r8,%r9,__LC_PGM_OLD_PSW
tmhh %r8,0x0001 # test problem state bit
@@ -501,7 +500,7 @@ ENTRY(pgm_check_handler)
2: LAST_BREAK %r14
UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER
lg %r15,__LC_KERNEL_STACK
- lg %r14,__TI_task(%r12)
+ lgr %r14,%r12
aghi %r14,__TASK_thread # pointer to thread_struct
lghi %r13,__LC_PGM_TDB
tm __LC_PGM_ILC+2,0x02 # check for transaction abort
@@ -567,7 +566,7 @@ ENTRY(io_int_handler)
stpt __LC_ASYNC_ENTER_TIMER
stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
lg %r10,__LC_LAST_BREAK
- lg %r12,__LC_THREAD_INFO
+ lg %r12,__LC_CURRENT
larl %r13,cleanup_critical
lmg %r8,%r9,__LC_IO_OLD_PSW
SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER
@@ -741,7 +740,7 @@ ENTRY(ext_int_handler)
stpt __LC_ASYNC_ENTER_TIMER
stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
lg %r10,__LC_LAST_BREAK
- lg %r12,__LC_THREAD_INFO
+ lg %r12,__LC_CURRENT
larl %r13,cleanup_critical
lmg %r8,%r9,__LC_EXT_OLD_PSW
SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER
@@ -889,7 +888,7 @@ ENTRY(mcck_int_handler)
spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer
lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
lg %r10,__LC_LAST_BREAK
- lg %r12,__LC_THREAD_INFO
+ lg %r12,__LC_CURRENT
larl %r13,cleanup_critical
lmg %r8,%r9,__LC_MCK_OLD_PSW
TSTMSK __LC_MCCK_CODE,MCCK_CODE_SYSTEM_DAMAGE
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index 03c2b469c472..a46201d2ed07 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -32,10 +32,9 @@ ENTRY(startup_continue)
#
# Setup stack
#
- larl %r15,init_thread_union
- stg %r15,__LC_THREAD_INFO # cache thread info in lowcore
- lg %r14,__TI_task(%r15) # cache current in lowcore
+ larl %r14,init_task
stg %r14,__LC_CURRENT
+ larl %r15,init_thread_union
aghi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE
stg %r15,__LC_KERNEL_STACK # set end of kernel stack
aghi %r15,-160
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 268d6c1b651f..b75da681d4c5 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -329,8 +329,7 @@ static void __init setup_lowcore(void)
lc->panic_stack = (unsigned long)
__alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
+ PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
- lc->current_task = (unsigned long) init_thread_union.thread_info.task;
- lc->thread_info = (unsigned long) &init_thread_union;
+ lc->current_task = (unsigned long)&init_task;
lc->lpp = LPP_MAGIC;
lc->machine_flags = S390_lowcore.machine_flags;
lc->preempt_count = S390_lowcore.preempt_count;
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 35531fe1c5ea..8c7ab7bd3e10 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -263,7 +263,6 @@ static void pcpu_attach_task(struct pcpu *pcpu, struct task_struct *tsk)
lc->kernel_stack = (unsigned long) task_stack_page(tsk)
+ THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
- lc->thread_info = (unsigned long) task_thread_info(tsk);
lc->current_task = (unsigned long) tsk;
lc->lpp = LPP_MAGIC;
lc->current_pid = tsk->pid;