| Message ID | 1425991291-24462-1-git-send-email-haokexin@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Scott Wood |
| Headers | show |
diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h index e5f22c6c4bf9..70bd4381f8e6 100644 --- 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 */
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> --- v2: Only update the commit log. arch/powerpc/include/asm/paca.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)