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powerpc: Set stack limit properly in crit_transfer_to_handler

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Commit 9778b696a0 incorrectly
changes the code setting the stack limit on entry to the
kernel to mark the thread_info at the bottom of the stack
out of bounds anymore. This fixes it.

Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Stuart Yoder 2012-07-16 09:06:48 +00:00 committed by Benjamin Herrenschmidt
parent bdc0077af5
commit 1f8b0bc81a
1 changed files with 10 additions and 2 deletions
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12
arch/powerpc/kernel/entry_32.S
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@ -89,10 +89,14 @@ crit_transfer_to_handler:
mfspr r0,SPRN_SRR1
stw r0,_SRR1(r11)
/* set the stack limit to the current stack
* and set the limit to protect the thread_info
* struct
*/
mfspr r8,SPRN_SPRG_THREAD
lwz r0,KSP_LIMIT(r8)
stw r0,SAVED_KSP_LIMIT(r11)
CURRENT_THREAD_INFO(r0, r1)
rlwimi r0,r1,0,0,(31-THREAD_SHIFT)
stw r0,KSP_LIMIT(r8)
/* fall through */
#endif
@ -109,10 +113,14 @@ crit_transfer_to_handler:
mfspr r0,SPRN_SRR1
stw r0,crit_srr1@l(0)
/* set the stack limit to the current stack
* and set the limit to protect the thread_info
* struct
*/
mfspr r8,SPRN_SPRG_THREAD
lwz r0,KSP_LIMIT(r8)
stw r0,saved_ksp_limit@l(0)
CURRENT_THREAD_INFO(r0, r1)
rlwimi r0,r1,0,0,(31-THREAD_SHIFT)
stw r0,KSP_LIMIT(r8)
/* fall through */
#endif