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powerpc: 'current_set' is now a table of task_struct pointers 

The table of pointers 'current_set' has been used for retrieving
the stack and current. They used to be thread_info pointers as
they were pointing to the stack and current was taken from the
'task' field of the thread_info.

Now, the pointers of 'current_set' table are now both pointers
to task_struct and pointers to thread_info.

As they are used to get current, and the stack pointer is
retrieved from current's stack field, this patch changes
their type to task_struct, and renames secondary_ti to
secondary_current.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2019-01-31 10:09:02 +00:00 committed by Michael Ellerman
parent a7916a1de5
commit 7c19c2e5f9
5 changed files with 13 additions and 15 deletions
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4
arch/powerpc/include/asm/asm-prototypes.h
View File

@ -23,8 +23,8 @@
#include <uapi/asm/ucontext.h>
/* SMP */
extern struct thread_info *current_set[NR_CPUS];
extern struct thread_info *secondary_ti;
extern struct task_struct *current_set[NR_CPUS];
extern struct task_struct *secondary_current;
void start_secondary(void *unused);
/* kexec */

6
arch/powerpc/kernel/head_32.S
View File

@ -832,9 +832,9 @@ __secondary_start:
#endif /* CONFIG_PPC_BOOK3S_32 */
/* get current's stack and current */
lis r1,secondary_ti@ha
tophys(r1,r1)
lwz r2,secondary_ti@l(r1)
lis r2,secondary_current@ha
tophys(r2,r2)
lwz r2,secondary_current@l(r2)
tophys(r1,r2)
lwz r1,TASK_STACK(r1)

4
arch/powerpc/kernel/head_44x.S
View File

@ -1020,8 +1020,8 @@ _GLOBAL(start_secondary_47x)
/* Now we can get our task struct and real stack pointer */
/* Get current's stack and current */
lis r1,secondary_ti@ha
lwz r2,secondary_ti@l(r1)
lis r2,secondary_current@ha
lwz r2,secondary_current@l(r2)
lwz r1,TASK_STACK(r2)
/* Current stack pointer */

4
arch/powerpc/kernel/head_fsl_booke.S
View File

@ -1091,8 +1091,8 @@ __secondary_start:
bl call_setup_cpu
/* get current's stack and current */
lis r1,secondary_ti@ha
lwz r2,secondary_ti@l(r1)
lis r2,secondary_current@ha
lwz r2,secondary_current@l(r2)
lwz r1,TASK_STACK(r2)
/* stack */

10
arch/powerpc/kernel/smp.c
View File

@ -76,7 +76,7 @@
static DEFINE_PER_CPU(int, cpu_state) = { 0 };
#endif
struct thread_info *secondary_ti;
struct task_struct *secondary_current;
bool has_big_cores;
DEFINE_PER_CPU(cpumask_var_t, cpu_sibling_map);
@ -631,7 +631,7 @@ void smp_send_stop(void)
}
#endif /* CONFIG_NMI_IPI */
struct thread_info *current_set[NR_CPUS];
struct task_struct *current_set[NR_CPUS];
static void smp_store_cpu_info(int id)
{
@ -896,7 +896,7 @@ void smp_prepare_boot_cpu(void)
paca_ptrs[boot_cpuid]->__current = current;
#endif
set_numa_node(numa_cpu_lookup_table[boot_cpuid]);
current_set[boot_cpuid] = task_thread_info(current);
current_set[boot_cpuid] = current;
}
#ifdef CONFIG_HOTPLUG_CPU
@ -981,15 +981,13 @@ static bool secondaries_inhibited(void)
static void cpu_idle_thread_init(unsigned int cpu, struct task_struct *idle)
{
struct thread_info *ti = task_thread_info(idle);
#ifdef CONFIG_PPC64
paca_ptrs[cpu]->__current = idle;
paca_ptrs[cpu]->kstack = (unsigned long)task_stack_page(idle) +
THREAD_SIZE - STACK_FRAME_OVERHEAD;
#endif
idle->cpu = cpu;
secondary_ti = current_set[cpu] = ti;
secondary_current = current_set[cpu] = idle;
}
int __cpu_up(unsigned int cpu, struct task_struct *tidle)