linux-kernel - [RFC PATCH v1 02/17] powerpc/mm: remove direct use of flags related to cache

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Date:   Wed,  5 Sep 2018 12:36:55 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, npiggin@...il.com,
        aneesh.kumar@...ux.vnet.ibm.com
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH v1 02/17] powerpc/mm: remove direct use of flags related
 to cache

As already done for PPC64, use pgprot_cache() helpers
instead of flags in ioremap() derived functions.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/include/asm/nohash/pgtable.h |  2 ++
 arch/powerpc/mm/pgtable_32.c              | 15 +++++++++------
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h
index b321c82b3624..5b82e44c4231 100644
--- a/arch/powerpc/include/asm/nohash/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/pgtable.h
@@ -197,6 +197,8 @@ extern int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long addre
 #if _PAGE_WRITETHRU != 0
 #define pgprot_cached_wthru(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \
 				            _PAGE_COHERENT | _PAGE_WRITETHRU))
+#else
+#define pgprot_cached_wthru(prot)	pgprot_noncached(prot)
 #endif
 
 #define pgprot_cached_noncoherent(prot) \
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 528999738645..f983ffa24aa0 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -76,24 +76,27 @@ pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
 void __iomem *
 ioremap(phys_addr_t addr, unsigned long size)
 {
-	return __ioremap_caller(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED,
-				__builtin_return_address(0));
+	unsigned long flags = pgprot_val(pgprot_noncached(__pgprot(0)));
+
+	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
 }
 EXPORT_SYMBOL(ioremap);
 
 void __iomem *
 ioremap_wc(phys_addr_t addr, unsigned long size)
 {
-	return __ioremap_caller(addr, size, _PAGE_NO_CACHE,
-				__builtin_return_address(0));
+	unsigned long flags = pgprot_val(pgprot_noncached_wc(__pgprot(0)));
+
+	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
 }
 EXPORT_SYMBOL(ioremap_wc);
 
 void __iomem *
 ioremap_wt(phys_addr_t addr, unsigned long size)
 {
-	return __ioremap_caller(addr, size, _PAGE_WRITETHRU,
-				__builtin_return_address(0));
+	unsigned long flags = pgprot_val(pgprot_cached_wthru(__pgprot(0)));
+
+	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
 }
 EXPORT_SYMBOL(ioremap_wt);
 
-- 
2.13.3