linux-kernel - [RFC PATCH 7/11] x86, mm: Keep _set_memory

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Date:	Tue, 15 Jul 2014 13:34:40 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	hpa@...or.com, tglx@...utronix.de, mingo@...hat.com,
	akpm@...ux-foundation.org, arnd@...db.de, konrad.wilk@...cle.com,
	plagnioj@...osoft.com, tomi.valkeinen@...com
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	stefan.bader@...onical.com, luto@...capital.net, airlied@...il.com,
	bp@...en8.de, Toshi Kani <toshi.kani@...com>
Subject: [RFC PATCH 7/11] x86, mm: Keep _set_memory_<type>() slot-independent

The _set_memory_<type>() interfaces assume how each memory type is
assigned to PAT slots in the PAT MSTR.  For instance, _set_memory_wb()
assumes that WB is assigned to the PA0/4 slot by calling
change_page_attr_clear().

This patch changes the _set_memory_<type>() interfaces to call
change_page_attr_set_clr() directly for all memory types, and keep
them independent from the PAT slot assignment.

It also introduces pgprot_set_cache() for setting a specified page
cache value to a pgprot_t value.

Signed-off-by: Toshi Kani <toshi.kani@...com>
---
 arch/x86/mm/pageattr.c |   36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index a2a1e70..da597d0 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -1444,8 +1444,10 @@ int _set_memory_uc(unsigned long addr, int numpages)
 	/*
 	 * for now UC MINUS. see comments in ioremap_nocache()
 	 */
-	return change_page_attr_set(&addr, numpages,
-				    __pgprot(_PAGE_CACHE_UC_MINUS), 0);
+	return change_page_attr_set_clr(&addr, numpages,
+					__pgprot(_PAGE_CACHE_UC_MINUS),
+					__pgprot(_PAGE_CACHE_MASK),
+					0, 0, NULL);
 }
 
 int set_memory_uc(unsigned long addr, int numpages)
@@ -1489,8 +1491,10 @@ static int _set_memory_array(unsigned long *addr, int addrinarray,
 			goto out_free;
 	}
 
-	ret = change_page_attr_set(addr, addrinarray,
-				    __pgprot(_PAGE_CACHE_UC_MINUS), 1);
+	ret = change_page_attr_set_clr(addr, addrinarray,
+				       __pgprot(_PAGE_CACHE_UC_MINUS),
+				       __pgprot(_PAGE_CACHE_MASK),
+				       0, CPA_ARRAY, NULL);
 
 	if (!ret && new_type == _PAGE_CACHE_WC)
 		ret = change_page_attr_set_clr(addr, addrinarray,
@@ -1526,8 +1530,10 @@ int _set_memory_wc(unsigned long addr, int numpages)
 	int ret;
 	unsigned long addr_copy = addr;
 
-	ret = change_page_attr_set(&addr, numpages,
-				    __pgprot(_PAGE_CACHE_UC_MINUS), 0);
+	ret = change_page_attr_set_clr(&addr, numpages,
+				       __pgprot(_PAGE_CACHE_UC_MINUS),
+				       __pgprot(_PAGE_CACHE_MASK),
+				       0, 0, NULL);
 	if (!ret) {
 		ret = change_page_attr_set_clr(&addr_copy, numpages,
 					       __pgprot(_PAGE_CACHE_WC),
@@ -1570,8 +1576,10 @@ EXPORT_SYMBOL(set_memory_array_wt);
 
 int _set_memory_wt(unsigned long addr, int numpages)
 {
-	return change_page_attr_set(&addr, numpages,
-				    __pgprot(_PAGE_CACHE_WT), 0);
+	return change_page_attr_set_clr(&addr, numpages,
+					__pgprot(_PAGE_CACHE_WT),
+					__pgprot(_PAGE_CACHE_MASK),
+					0, 0, NULL);
 }
 
 int set_memory_wt(unsigned long addr, int numpages)
@@ -1601,8 +1609,10 @@ EXPORT_SYMBOL(set_memory_wt);
 
 int _set_memory_wb(unsigned long addr, int numpages)
 {
-	return change_page_attr_clear(&addr, numpages,
-				      __pgprot(_PAGE_CACHE_MASK), 0);
+	return change_page_attr_set_clr(&addr, numpages,
+					__pgprot(_PAGE_CACHE_WB),
+					__pgprot(_PAGE_CACHE_MASK),
+					0, 0, NULL);
 }
 
 int set_memory_wb(unsigned long addr, int numpages)
@@ -1623,8 +1633,10 @@ int set_memory_array_wb(unsigned long *addr, int addrinarray)
 	int i;
 	int ret;
 
-	ret = change_page_attr_clear(addr, addrinarray,
-				      __pgprot(_PAGE_CACHE_MASK), 1);
+	ret = change_page_attr_set_clr(addr, addrinarray,
+				       __pgprot(_PAGE_CACHE_WB),
+				       __pgprot(_PAGE_CACHE_MASK),
+				       0, CPA_ARRAY, NULL);
 	if (ret)
 		return ret;
 
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