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powerpc: align stack to 2 * THREAD_SIZE with VMAP_STACK

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In order to ease stack overflow detection, align
stack to 2 * THREAD_SIZE when using VMAP_STACK.
This allows overflow detection using a single bit check.

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/60e9ae86b7d2cdcf21468787076d345663648f46.1576916812.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy
2019-12-21 08:32:28 +00:00
committed by Michael Ellerman
parent 028474876f
commit 63289e7d3a
4 changed files with 16 additions and 3 deletions
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2
arch/powerpc/kernel/setup_32.c
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@@ -140,7 +140,7 @@ arch_initcall(ppc_init);
static void *__init alloc_stack(void)
{
void *ptr = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
void *ptr = memblock_alloc(THREAD_SIZE, THREAD_ALIGN);
if (!ptr)
panic("cannot allocate %d bytes for stack at %pS\n",