[IA64] Fix stack placement when INIT hits in kernel mode.

Without this patch, the stack is placed _below_ the current task
structure, which is risky at best.

Tony, I think this patch needs to go into 2.6.12, since it fixes a
real bug.  Without it, INIT may case secondary errors, which would be
most unpleasant.

Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

diff --git a/arch/ia64/kernel/minstate.h b/arch/ia64/kernel/minstate.h
index 1dbc7b2497c90d4b3c0a8cef4c7afb94e7abc315..f6d8a010d99beacb04dc2d3a9cf8af2e14237a3e 100644 (file)
--- a/arch/ia64/kernel/minstate.h
+++ b/arch/ia64/kernel/minstate.h
@@ -41,7 +41,7 @@
 (pKStk) addl r3=THIS_CPU(ia64_mca_data),r3;;                                                   \
 (pKStk) ld8 r3 = [r3];;                                                                                \
 (pKStk) addl r3=IA64_MCA_CPU_INIT_STACK_OFFSET,r3;;                                            \
-(pKStk) addl sp=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r3;                                          \
+(pKStk) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r3;                                          \
 (pUStk)        mov ar.rsc=0;           /* set enforced lazy mode, pl 0, little-endian, loadrs=0 */     \
 (pUStk)        addl r22=IA64_RBS_OFFSET,r1;            /* compute base of register backing store */    \
        ;;                                                                                      \
@@ -50,7 +50,6 @@
 (pUStk)        mov r23=ar.bspstore;                            /* save ar.bspstore */                  \
 (pUStk)        dep r22=-1,r22,61,3;                    /* compute kernel virtual addr of RBS */        \
        ;;                                                                                      \
-(pKStk) addl r1=-IA64_PT_REGS_SIZE,r1;         /* if in kernel mode, use sp (r12) */           \
 (pUStk)        mov ar.bspstore=r22;                    /* switch to kernel RBS */                      \
        ;;                                                                                      \
 (pUStk)        mov r18=ar.bsp;                                                                         \