powerpc/book3e: Fix extlb size

The calculation of the size for the exception save area of the TLB
miss handler is wrong, luckily it's too big not too small.

Rework it to make it a bit clearer, and also correct. We want 3 save
areas, each EX_TLB_SIZE _bytes_.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h
index f6da4f517fca2f15cc4b04e562d760520057f183..65c13c48db43201a57ce74cb720aabd1301757ea 100644 (file)
--- a/arch/powerpc/include/asm/paca.h
+++ b/arch/powerpc/include/asm/paca.h
@@ -106,7 +106,8 @@ struct paca_struct {
        pgd_t *pgd;                     /* Current PGD */
        pgd_t *kernel_pgd;              /* Kernel PGD */
        u64 exgen[8] __attribute__((aligned(0x80)));
-       u64 extlb[EX_TLB_SIZE*3] __attribute__((aligned(0x80)));
+       /* We can have up to 3 levels of reentrancy in the TLB miss handler */
+       u64 extlb[3][EX_TLB_SIZE / sizeof(u64)] __attribute__((aligned(0x80)));
        u64 exmc[8];            /* used for machine checks */
        u64 excrit[8];          /* used for crit interrupts */
        u64 exdbg[8];           /* used for debug interrupts */