From: Paul Cercueil <paul@crapouillou.net>
To: Ralf Baechle <ralf@linux-mips.org>,
Paul Burton <paul.burton@mips.com>,
James Hogan <jhogan@kernel.org>
Cc: od@zcrc.me, linux-mips@vger.kernel.org,
linux-kernel@vger.kernel.org, Daniel Silsby <dansilsby@gmail.com>,
Paul Cercueil <paul@crapouillou.net>
Subject: [PATCH 1/5] MIPS: Disallow CPU_SUPPORTS_HUGEPAGES for XPA,EVA
Date: Mon, 15 Jul 2019 17:39:59 -0400 [thread overview]
Message-ID: <20190715214003.9714-1-paul@crapouillou.net> (raw)
From: Daniel Silsby <dansilsby@gmail.com>
In preparation for 32-bit MIPS huge page support.
EVA,XPA are extended-addressing modes for 32-bit MIPS systems. Because
huge pages aren't currently supported in 32-bit MIPS, this doesn't take
any features away from EVA,XPA-enabled systems. However, the soon-to-
come 32-bit MIPS huge page support doesn't yet support them.
This also disables CPU_SUPPORTS_HUGEPAGES for the small number of 32-bit
MIPS CPUs from Alchemy/Netlogic that support a custom 36-bit extended
addressing. It's unknown if they even support huge pages in hardware.
Signed-off-by: Daniel Silsby <dansilsby@gmail.com>
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
arch/mips/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index d50fafd7bf3a..ff5f1314241e 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2110,6 +2110,7 @@ config CPU_SUPPORTS_ADDRWINCFG
bool
config CPU_SUPPORTS_HUGEPAGES
bool
+ depends on !(32BIT && (ARCH_PHYS_ADDR_T_64BIT || EVA))
config CPU_SUPPORTS_UNCACHED_ACCELERATED
bool
config MIPS_PGD_C0_CONTEXT
--
2.21.0.593.g511ec345e18
next reply other threads:[~2019-07-15 21:40 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-15 21:39 Paul Cercueil [this message]
2019-07-15 21:40 ` [PATCH 2/5] MIPS: Add partial 32-bit huge page support Paul Cercueil
2019-07-22 21:20 ` Paul Burton
2019-07-15 21:40 ` [PATCH 3/5] MIPS: Decouple CPU_SUPPORTS_HUGEPAGES from 64BIT Paul Cercueil
2019-07-22 21:21 ` Paul Burton
2019-07-15 21:40 ` [PATCH 4/5] MIPS: ingenic: Add support for huge pages Paul Cercueil
2019-07-22 21:21 ` Paul Burton
2019-07-15 21:40 ` [PATCH 5/5] MIPS: Undefine PMD_ORDER for 32-bit builds Paul Cercueil
2019-07-22 21:21 ` Paul Burton
2019-07-22 21:15 ` [PATCH 1/5] MIPS: Disallow CPU_SUPPORTS_HUGEPAGES for XPA,EVA Paul Burton
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