From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>
Subject: [RFC PATCH 03/11] powerpc/64s/radix: Remove SLB address limit for per-cpu stacks
Date: Sat, 22 Jul 2017 11:17:33 +1000 [thread overview]
Message-ID: <20170722011741.13942-4-npiggin@gmail.com> (raw)
In-Reply-To: <20170722011741.13942-1-npiggin@gmail.com>
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
next prev parent reply other threads:[~2017-07-22 1:18 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-22 1:17 [RFC PATCH 00/11] relaxing allocation constraints on radix and bare metal Nicholas Piggin
2017-07-22 1:17 ` [RFC PATCH 01/11] powerpc/powernv: powernv platform is not constrained by RMA Nicholas Piggin
2017-07-22 1:17 ` [RFC PATCH 02/11] powerpc/powernv: Remove real mode access limit for early allocations Nicholas Piggin
2017-07-22 1:17 ` Nicholas Piggin [this message]
2017-07-22 1:17 ` [RFC PATCH 04/11] powerpc/64s: Relax PACA address limitations Nicholas Piggin
2017-07-22 1:17 ` [RFC PATCH 05/11] powerpc/64s/radix: Do not allocate SLB shadow structures Nicholas Piggin
2017-07-22 1:17 ` [RFC PATCH 06/11] powerpc/64s: do not allocate lppaca if we are not virtualized Nicholas Piggin
2017-07-22 1:17 ` [RFC PATCH 07/11] mm: make memblock_alloc_base_nid non-static Nicholas Piggin
2017-07-22 1:17 ` [RFC PATCH 08/11] powerpc/64: Allocate PACAs node-local if possible Nicholas Piggin
2017-07-22 1:17 ` [RFC PATCH 09/11] powerpc/64s: Allocate LPPACAs " Nicholas Piggin
2017-07-22 1:17 ` [RFC PATCH 10/11] powerpc/64: allocate per-cpu stacks " Nicholas Piggin
2017-07-22 1:17 ` [RFC PATCH 11/11] powerpc/64s/radix: allocate kernel page tables " Nicholas Piggin
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