diff mbox series

[1/5] MIPS: Disallow CPU_SUPPORTS_HUGEPAGES for XPA,EVA

Message ID 20190715214003.9714-1-paul@crapouillou.net (mailing list archive)
State Mainlined
Commit 171543e752723191281994e51278050526d1c017
Headers show
Series [1/5] MIPS: Disallow CPU_SUPPORTS_HUGEPAGES for XPA,EVA | expand

Commit Message

Paul Cercueil July 15, 2019, 9:39 p.m. UTC 
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(+)

Comments

Paul Burton July 22, 2019, 9:15 p.m. UTC | #1 
Hello,

Paul Cercueil wrote:
> 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>

Series applied to mips-next.

Thanks,
    Paul

[ This message was auto-generated; if you believe anything is incorrect
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diff mbox series

Patch

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