powerpc: book3e_64: fix the align size for paca_struct

All the cache line size of the current book3e 64bit SoCs are 64 bytes.
So we should use this size to align the member of paca_struct.
This only change the paca_struct's members which are private to book3e
CPUs, and should not have any effect to book3s ones. With this, we save
192 bytes. Also change it to __aligned(size) since it is preferred over
__attribute__((aligned(size))).

Before:
	/* size: 1920, cachelines: 30, members: 46 */
	/* sum members: 1667, holes: 6, sum holes: 141 */
	/* padding: 112 */

After:
	/* size: 1728, cachelines: 27, members: 46 */
	/* sum members: 1667, holes: 4, sum holes: 13 */
	/* padding: 48 */

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>

diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h
index e5f22c6..70bd438 100644 (file)
--- a/arch/powerpc/include/asm/paca.h
+++ b/arch/powerpc/include/asm/paca.h
@@ -106,9 +106,9 @@ struct paca_struct {
 #endif /* CONFIG_PPC_STD_MMU_64 */
 
 #ifdef CONFIG_PPC_BOOK3E
-       u64 exgen[8] __attribute__((aligned(0x80)));
+       u64 exgen[8] __aligned(0x40);
        /* Keep pgd in the same cacheline as the start of extlb */
-       pgd_t *pgd __attribute__((aligned(0x80))); /* Current PGD */
+       pgd_t *pgd __aligned(0x40); /* Current PGD */
        pgd_t *kernel_pgd;              /* Kernel PGD */
 
        /* Shared by all threads of a core -- points to tcd of first thread */