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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-03-16 14:54:35 +1100 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-04-20 11:03:24 +1000 |
| commit | 9d07bc841c9779b4d7902e417f4e509996ce805d (patch) | |
| tree | 7a381096d3da7497aac58c4ec18c74299ee47fb4 /arch/powerpc/kernel/head_64.S | |
| parent | ad0693ee722b93b63a89c845e99513f242e43aa6 (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.S | 18 |
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 |