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powerpc: regain entire stack space

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thread_info is not anymore in the stack, so the entire stack
can now be used.

There is also no risk anymore of corrupting task_cpu(p) with a
stack overflow so the patch removes the test.

When doing this, an explicit test for NULL stack pointer is
needed in validate_sp() as it is not anymore implicitely covered
by the sizeof(thread_info) gap.

In the meantime, with the previous patch all pointers to the stacks
are not anymore pointers to thread_info so this patch changes them
to void*

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 10:09:00 +00:00 • committed by Michael Ellerman
parent ed1cd6deb0
commit a7916a1de5
8 changed files with 37 additions and 54 deletions
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3
arch/powerpc/include/asm/processor.h
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@ -270,8 +270,7 @@ struct thread_struct {
#define ARCH_MIN_TASKALIGN 16
#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
#define INIT_SP_LIMIT \
(_ALIGN_UP(sizeof(struct thread_info), 16) + (unsigned long)&init_stack)
#define INIT_SP_LIMIT ((unsigned long)&init_stack)
#ifdef CONFIG_SPE
#define SPEFSCR_INIT \