[RFC PATCH 03/11] powerpc/64s/radix: Remove SLB address limit for per-cpu stacks
From: Nicholas Piggin <npiggin@gmail.com>
Date: 2017-07-22 01:18:03
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
Radix MMU does not take SLB or TLB interrupts when accessing kernel linear address. Remove this restriction for radix mode. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> --- arch/powerpc/kernel/setup_64.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index af23d4b576ec..4ecc4315b308 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c@@ -564,6 +564,9 @@ static __init u64 safe_stack_limit(void) /* Other BookE, we assume the first GB is bolted */ return 1ul << 30; #else + if (early_radix_enabled()) + return ULONG_MAX; + /* BookS, the first segment is bolted */ if (mmu_has_feature(MMU_FTR_1T_SEGMENT)) return 1UL << SID_SHIFT_1T;
--
2.11.0