From: Matt Evans <[email protected]> commit f761622e59433130bc33ad086ce219feee9eb961 upstream.
As early setup calls down to slb_initialize(), we must have kstack initialised before checking "should we add a bolted SLB entry for our kstack?" Failing to do so means stack access requires an SLB miss exception to refill an entry dynamically, if the stack isn't accessible via SLB(0) (kernel text & static data). It's not always allowable to take such a miss, and intermittent crashes will result. Primary CPUs don't have this issue; an SLB entry is not bolted for their stack anyway (as that lives within SLB(0)). This patch therefore only affects the init of secondaries. Signed-off-by: Matt Evans <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]> Signed-off-by: Paul Gortmaker <[email protected]> --- arch/powerpc/kernel/head_64.S | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index bed9a29..579751e 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -572,9 +572,6 @@ __secondary_start: /* Set thread priority to MEDIUM */ HMT_MEDIUM - /* Do early setup for that CPU (stab, slb, hash table pointer) */ - bl .early_setup_secondary - /* Initialize the kernel stack. Just a repeat for iSeries. */ LOAD_REG_ADDR(r3, current_set) sldi r28,r24,3 /* get current_set[cpu#] */ @@ -582,6 +579,9 @@ __secondary_start: addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD std r1,PACAKSAVE(r13) + /* Do early setup for that CPU (stab, slb, hash table pointer) */ + bl .early_setup_secondary + /* Clear backchain so we get nice backtraces */ li r7,0 mtlr r7 -- 1.7.3.3 _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
