diff options
| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-01-31 10:09:00 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-02-23 22:31:40 +1100 |
| commit | a7916a1de526162d73e894b6d3ebd895d4302078 (patch) | |
| tree | d34624a17b6475cc0e45bafdde2c6d51b6a70626 /arch/powerpc/kernel/setup_64.c | |
| parent | ed1cd6deb013a11959d17a94e35ce159197632da (diff) | |
powerpc: regain entire stack space
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>
Diffstat (limited to 'arch/powerpc/kernel/setup_64.c')
| -rw-r--r-- | arch/powerpc/kernel/setup_64.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 0912948a8ea6..2db1c5f7d141 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -716,19 +716,19 @@ void __init emergency_stack_init(void) limit = min(ppc64_bolted_size(), ppc64_rma_size); for_each_possible_cpu(i) { - struct thread_info *ti; + void *ti; ti = alloc_stack(limit, i); - paca_ptrs[i]->emergency_sp = (void *)ti + THREAD_SIZE; + paca_ptrs[i]->emergency_sp = ti + THREAD_SIZE; #ifdef CONFIG_PPC_BOOK3S_64 /* emergency stack for NMI exception handling. */ ti = alloc_stack(limit, i); - paca_ptrs[i]->nmi_emergency_sp = (void *)ti + THREAD_SIZE; + paca_ptrs[i]->nmi_emergency_sp = ti + THREAD_SIZE; /* emergency stack for machine check exception handling. */ ti = alloc_stack(limit, i); - paca_ptrs[i]->mc_emergency_sp = (void *)ti + THREAD_SIZE; + paca_ptrs[i]->mc_emergency_sp = ti + THREAD_SIZE; #endif } } |