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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_64.c
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@@ -633,7 +633,7 @@ static void *__init alloc_stack(unsigned long limit, int cpu)
BUILD_BUG_ON(STACK_INT_FRAME_SIZE % 16);
ptr = memblock_alloc_try_nid(THREAD_SIZE, THREAD_SIZE,
ptr = memblock_alloc_try_nid(THREAD_SIZE, THREAD_ALIGN,
MEMBLOCK_LOW_LIMIT, limit,
early_cpu_to_node(cpu));
if (!ptr)