ARM: 8612/1: LPAE: initialize cache policy correctly

The cachepolicy variable gets initialized using a masked pmd
value. So far, the pmd has been masked with flags valid for the
2-page table format, but the 3-page table format requires a
different mask. On LPAE, this lead to a wrong assumption of what
initial cache policy has been used. Later a check forces the
cache policy to writealloc and prints the following warning:
Forcing write-allocate cache policy for SMP

This patch introduces a new definition PMD_SECT_CACHE_MASK for
both page table formats which masks in all cache flags in both
cases.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/include/asm/pgtable-2level-hwdef.h b/arch/arm/include/asm/pgtable-2level-hwdef.h
index d0131ee..3f82e9d 100644 (file)
--- a/arch/arm/include/asm/pgtable-2level-hwdef.h
+++ b/arch/arm/include/asm/pgtable-2level-hwdef.h
@@ -47,6 +47,7 @@
 #define PMD_SECT_WB            (PMD_SECT_CACHEABLE | PMD_SECT_BUFFERABLE)
 #define PMD_SECT_MINICACHE     (PMD_SECT_TEX(1) | PMD_SECT_CACHEABLE)
 #define PMD_SECT_WBWA          (PMD_SECT_TEX(1) | PMD_SECT_CACHEABLE | PMD_SECT_BUFFERABLE)
+#define PMD_SECT_CACHE_MASK    (PMD_SECT_TEX(1) | PMD_SECT_CACHEABLE | PMD_SECT_BUFFERABLE)
 #define PMD_SECT_NONSHARED_DEV (PMD_SECT_TEX(2))
 
 /*

diff --git a/arch/arm/include/asm/pgtable-3level-hwdef.h b/arch/arm/include/asm/pgtable-3level-hwdef.h
index f8f1cff..4cd664a 100644 (file)
--- a/arch/arm/include/asm/pgtable-3level-hwdef.h
+++ b/arch/arm/include/asm/pgtable-3level-hwdef.h
@@ -62,6 +62,7 @@
 #define PMD_SECT_WT            (_AT(pmdval_t, 2) << 2) /* normal inner write-through */
 #define PMD_SECT_WB            (_AT(pmdval_t, 3) << 2) /* normal inner write-back */
 #define PMD_SECT_WBWA          (_AT(pmdval_t, 7) << 2) /* normal inner write-alloc */
+#define PMD_SECT_CACHE_MASK    (_AT(pmdval_t, 7) << 2)
 
 /*
  * + Level 3 descriptor (PTE)

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 6344913..30fe03f 100644 (file)
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -137,7 +137,7 @@ void __init init_default_cache_policy(unsigned long pmd)
 
        initial_pmd_value = pmd;
 
-       pmd &= PMD_SECT_TEX(1) | PMD_SECT_BUFFERABLE | PMD_SECT_CACHEABLE;
+       pmd &= PMD_SECT_CACHE_MASK;
 
        for (i = 0; i < ARRAY_SIZE(cache_policies); i++)
                if (cache_policies[i].pmd == pmd) {