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powerpc/irq: use memblock functions returning virtual address

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Since only the virtual address of allocated blocks is used,
lets use functions returning directly virtual address.

Those functions have the advantage of also zeroing the block.

Suggested-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2019-01-31 10:08:44 +00:00 committed by Michael Ellerman
parent eafd825ed7
commit c8e409a33c
3 changed files with 23 additions and 27 deletions
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5
arch/powerpc/kernel/irq.c
View File

@ -725,18 +725,15 @@ void exc_lvl_ctx_init(void)
#endif
#endif
memset((void *)critirq_ctx[cpu_nr], 0, THREAD_SIZE);
tp = critirq_ctx[cpu_nr];
tp->cpu = cpu_nr;
tp->preempt_count = 0;
#ifdef CONFIG_BOOKE
memset((void *)dbgirq_ctx[cpu_nr], 0, THREAD_SIZE);
tp = dbgirq_ctx[cpu_nr];
tp->cpu = cpu_nr;
tp->preempt_count = 0;
memset((void *)mcheckirq_ctx[cpu_nr], 0, THREAD_SIZE);
tp = mcheckirq_ctx[cpu_nr];
tp->cpu = cpu_nr;
tp->preempt_count = HARDIRQ_OFFSET;
@ -754,12 +751,10 @@ void irq_ctx_init(void)
int i;
for_each_possible_cpu(i) {
memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
tp = softirq_ctx[i];
tp->cpu = i;
klp_init_thread_info(tp);
memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
tp = hardirq_ctx[i];
tp->cpu = i;
klp_init_thread_info(tp);

26
arch/powerpc/kernel/setup_32.c
View File

@ -196,6 +196,17 @@ static int __init ppc_init(void)
}
arch_initcall(ppc_init);
static void *__init alloc_stack(void)
{
void *ptr = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
if (!ptr)
panic("cannot allocate %d bytes for stack at %pS\n",
THREAD_SIZE, (void *)_RET_IP_);
return ptr;
}
void __init irqstack_early_init(void)
{
unsigned int i;
@ -203,10 +214,8 @@ void __init irqstack_early_init(void)
/* interrupt stacks must be in lowmem, we get that for free on ppc32
* as the memblock is limited to lowmem by default */
for_each_possible_cpu(i) {
softirq_ctx[i] = (struct thread_info *)
__va(memblock_phys_alloc(THREAD_SIZE, THREAD_SIZE));
hardirq_ctx[i] = (struct thread_info *)
__va(memblock_phys_alloc(THREAD_SIZE, THREAD_SIZE));
softirq_ctx[i] = alloc_stack();
hardirq_ctx[i] = alloc_stack();
}
}
@ -224,13 +233,10 @@ void __init exc_lvl_early_init(void)
hw_cpu = 0;
#endif
critirq_ctx[hw_cpu] = (struct thread_info *)
__va(memblock_phys_alloc(THREAD_SIZE, THREAD_SIZE));
critirq_ctx[hw_cpu] = alloc_stack();
#ifdef CONFIG_BOOKE
dbgirq_ctx[hw_cpu] = (struct thread_info *)
__va(memblock_phys_alloc(THREAD_SIZE, THREAD_SIZE));
mcheckirq_ctx[hw_cpu] = (struct thread_info *)
__va(memblock_phys_alloc(THREAD_SIZE, THREAD_SIZE));
dbgirq_ctx[hw_cpu] = alloc_stack();
mcheckirq_ctx[hw_cpu] = alloc_stack();
#endif
}
}

19
arch/powerpc/kernel/setup_64.c
View File

@ -634,19 +634,17 @@ __init u64 ppc64_bolted_size(void)
static void *__init alloc_stack(unsigned long limit, int cpu)
{
unsigned long pa;
void *ptr;
BUILD_BUG_ON(STACK_INT_FRAME_SIZE % 16);
pa = memblock_alloc_base_nid(THREAD_SIZE, THREAD_SIZE, limit,
early_cpu_to_node(cpu), MEMBLOCK_NONE);
if (!pa) {
pa = memblock_alloc_base(THREAD_SIZE, THREAD_SIZE, limit);
if (!pa)
panic("cannot allocate stacks");
}
ptr = memblock_alloc_try_nid(THREAD_SIZE, THREAD_SIZE,
MEMBLOCK_LOW_LIMIT, limit,
early_cpu_to_node(cpu));
if (!ptr)
panic("cannot allocate stacks");
return __va(pa);
return ptr;
}
void __init irqstack_early_init(void)
@ -739,20 +737,17 @@ void __init emergency_stack_init(void)
struct thread_info *ti;
ti = alloc_stack(limit, i);
memset(ti, 0, THREAD_SIZE);
emerg_stack_init_thread_info(ti, i);
paca_ptrs[i]->emergency_sp = (void *)ti + THREAD_SIZE;
#ifdef CONFIG_PPC_BOOK3S_64
/* emergency stack for NMI exception handling. */
ti = alloc_stack(limit, i);
memset(ti, 0, THREAD_SIZE);
emerg_stack_init_thread_info(ti, i);
paca_ptrs[i]->nmi_emergency_sp = (void *)ti + THREAD_SIZE;
/* emergency stack for machine check exception handling. */
ti = alloc_stack(limit, i);
memset(ti, 0, THREAD_SIZE);
emerg_stack_init_thread_info(ti, i);
paca_ptrs[i]->mc_emergency_sp = (void *)ti + THREAD_SIZE;
#endif