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powerpc/32: Use vmapped stacks for interrupts

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In order to also catch overflows on IRQ stacks, use vmapped stacks.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/d33ad1b36ddff4dcc19f96c592c12a61cf85d406.1576916812.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2019-12-21 08:32:30 +00:00 committed by Michael Ellerman
parent 3978eb7851
commit 547db12fd8
2 changed files with 25 additions and 0 deletions
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22
arch/powerpc/kernel/irq.c
View file

@ -50,6 +50,7 @@
#include <linux/debugfs.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/vmalloc.h>
#include <linux/uaccess.h>
#include <asm/io.h>
@ -664,8 +665,29 @@ void do_IRQ(struct pt_regs *regs)
set_irq_regs(old_regs);
}
static void *__init alloc_vm_stack(void)
{
return __vmalloc_node_range(THREAD_SIZE, THREAD_ALIGN, VMALLOC_START,
VMALLOC_END, THREADINFO_GFP, PAGE_KERNEL,
0, NUMA_NO_NODE, (void*)_RET_IP_);
}
static void __init vmap_irqstack_init(void)
{
int i;
for_each_possible_cpu(i) {
softirq_ctx[i] = alloc_vm_stack();
hardirq_ctx[i] = alloc_vm_stack();
}
}
void __init init_IRQ(void)
{
if (IS_ENABLED(CONFIG_VMAP_STACK))
vmap_irqstack_init();
if (ppc_md.init_IRQ)
ppc_md.init_IRQ();
}

3
arch/powerpc/kernel/setup_32.c
View file

@ -153,6 +153,9 @@ void __init irqstack_early_init(void)
{
unsigned int i;
if (IS_ENABLED(CONFIG_VMAP_STACK))
return;
/* 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) {