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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-03-16 14:54:35 +1100
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-04-20 11:03:24 +1000
commit9d07bc841c9779b4d7902e417f4e509996ce805d (patch)
tree7a381096d3da7497aac58c4ec18c74299ee47fb4 /arch/powerpc/kernel/head_64.S
parentad0693ee722b93b63a89c845e99513f242e43aa6 (diff)
powerpc: Properly handshake CPUs going out of boot spin loop
We need to wait a bit for them to have done their CPU setup or we might end up with translation and EE on with different LPCR values between threads Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/head_64.S')
-rw-r--r--arch/powerpc/kernel/head_64.S18
1 files changed, 13 insertions, 5 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 95944278380..0700e1135c9 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -242,23 +242,31 @@ generic_secondary_common_init:
ld r23,0(r23)
ld r23,CPU_SPEC_RESTORE(r23)
cmpdi 0,r23,0
- beq 4f
+ beq 3f
ld r23,0(r23)
mtctr r23
bctrl
-3: HMT_LOW
+3: LOAD_REG_ADDR(r3, boot_cpu_count) /* Decrement boot_cpu_count */
+ lwarx r4,0,r3
+ subi r4,r4,1
+ stwcx. r4,0,r3
+ bne 3b
+ isync
+
+4: HMT_LOW
lbz r23,PACAPROCSTART(r13) /* Test if this processor should */
/* start. */
#ifndef CONFIG_SMP
- b 3b /* Never go on non-SMP */
+ b 4b /* Never go on non-SMP */
#else
cmpwi 0,r23,0
- beq 3b /* Loop until told to go */
+ beq 4b /* Loop until told to go */
sync /* order paca.run and cur_cpu_spec */
+ isync /* In case code patching happened */
-4: /* Create a temp kernel stack for use before relocation is on. */
+ /* Create a temp kernel stack for use before relocation is on. */
ld r1,PACAEMERGSP(r13)
subi r1,r1,STACK_FRAME_OVERHEAD