linux-kernel - [PATCH] x86: adjust default caching mode translation tables

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Date:	Mon, 20 Jul 2015 08:46:14 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	<bp@...en.de>, <toshi.kani@...com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: adjust default caching mode translation tables

Make WT really mean WT (rather than UC).

I can't see why commit 9cd25aac1f ("x86/mm/pat: Emulate PAT when it is
disabled") didn't make this match its changes to pat_init().

Signed-off-by: Jan Beulich <jbeulich@...e.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Toshi Kani <toshi.kani@...com> 
---
 arch/x86/mm/init.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- 4.2-rc3/arch/x86/mm/init.c
+++ 4.2-rc3-x86-default-cache-mode/arch/x86/mm/init.c
@@ -43,18 +43,18 @@ uint16_t __cachemode2pte_tbl[_PAGE_CACHE
 	[_PAGE_CACHE_MODE_WC      ]	= 0         | _PAGE_PCD,
 	[_PAGE_CACHE_MODE_UC_MINUS]	= 0         | _PAGE_PCD,
 	[_PAGE_CACHE_MODE_UC      ]	= _PAGE_PWT | _PAGE_PCD,
-	[_PAGE_CACHE_MODE_WT      ]	= 0         | _PAGE_PCD,
+	[_PAGE_CACHE_MODE_WT      ]	= _PAGE_PWT | 0,
 	[_PAGE_CACHE_MODE_WP      ]	= 0         | _PAGE_PCD,
 };
 EXPORT_SYMBOL(__cachemode2pte_tbl);
 
 uint8_t __pte2cachemode_tbl[8] = {
 	[__pte2cm_idx( 0        | 0         | 0        )] = _PAGE_CACHE_MODE_WB,
-	[__pte2cm_idx(_PAGE_PWT | 0         | 0        )] = _PAGE_CACHE_MODE_UC_MINUS,
+	[__pte2cm_idx(_PAGE_PWT | 0         | 0        )] = _PAGE_CACHE_MODE_WT,
 	[__pte2cm_idx( 0        | _PAGE_PCD | 0        )] = _PAGE_CACHE_MODE_UC_MINUS,
 	[__pte2cm_idx(_PAGE_PWT | _PAGE_PCD | 0        )] = _PAGE_CACHE_MODE_UC,
 	[__pte2cm_idx( 0        | 0         | _PAGE_PAT)] = _PAGE_CACHE_MODE_WB,
-	[__pte2cm_idx(_PAGE_PWT | 0         | _PAGE_PAT)] = _PAGE_CACHE_MODE_UC_MINUS,
+	[__pte2cm_idx(_PAGE_PWT | 0         | _PAGE_PAT)] = _PAGE_CACHE_MODE_WT,
 	[__pte2cm_idx(0         | _PAGE_PCD | _PAGE_PAT)] = _PAGE_CACHE_MODE_UC_MINUS,
 	[__pte2cm_idx(_PAGE_PWT | _PAGE_PCD | _PAGE_PAT)] = _PAGE_CACHE_MODE_UC,
 };



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