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powerpc/8xx: set STACK_END_MAGIC earlier on the init_stack

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Today, the STACK_END_MAGIC is set on init_stack in start_kernel().

To avoid a false 'Thread overran stack, or stack corrupted' message
on early Oopses, setup STACK_END_MAGIC as soon as possible.

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/54f67bb7ac486c1350f2fa8905cd279f94b9dfb1.1566382841.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2019-08-21 10:20:51 +00:00 committed by Michael Ellerman
parent a045657412
commit 3bbd234373
1 changed files with 4 additions and 0 deletions
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4
arch/powerpc/kernel/head_8xx.S
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@ -15,6 +15,7 @@
*/
#include <linux/init.h>
#include <linux/magic.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/mmu.h>
@ -717,6 +718,9 @@ start_here:
/* stack */
lis r1,init_thread_union@ha
addi r1,r1,init_thread_union@l
lis r0, STACK_END_MAGIC@h
ori r0, r0, STACK_END_MAGIC@l
stw r0, 0(r1)
li r0,0
stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1)