diff options
| author | Paul Burton <[email protected]> | 2016-04-19 09:25:05 +0100 |
|---|---|---|
| committer | Ralf Baechle <[email protected]> | 2016-05-13 15:30:25 +0200 |
| commit | 7b2cb64f91f25a7293b10054e20d1c0734ffab6f (patch) | |
| tree | 6631b4d6dc4e3294bfecd1835000578ef374bd0f /arch/mips/mm/init.c | |
| parent | 745f35587846249b392aa548b4c5f54cd69ed688 (diff) | |
MIPS: mm: Fix MIPS32 36b physical addressing (alchemy, netlogic)
There are 2 distinct cases in which a kernel for a MIPS32 CPU
(CONFIG_CPU_MIPS32=y) may use 64 bit physical addresses
(CONFIG_PHYS_ADDR_T_64BIT=y):
- 36 bit physical addressing as used by RMI Alchemy & Netlogic XLP/XLR
CPUs.
- MIPS32r5 eXtended Physical Addressing (XPA).
These 2 cases are distinct in that they require different behaviour from
the kernel - the EntryLo registers have different formats. Until Linux
v4.1 we only supported the first case, with code conditional upon the 2
aforementioned Kconfig variables being set. Commit c5b367835cfc ("MIPS:
Add support for XPA.") added support for the second case, but did so by
modifying the code that existed for the first case rather than treating
the 2 cases as distinct. Since the EntryLo registers have different
formats this breaks the 36 bit Alchemy/XLP/XLR case. Fix this by
splitting the 2 cases, with XPA cases now being conditional upon
CONFIG_XPA and the non-XPA case matching the code as it existed prior to
commit c5b367835cfc ("MIPS: Add support for XPA.").
Signed-off-by: Paul Burton <[email protected]>
Reported-by: Manuel Lauss <[email protected]>
Tested-by: Manuel Lauss <[email protected]>
Fixes: c5b367835cfc ("MIPS: Add support for XPA.")
Cc: James Hogan <[email protected]>
Cc: David Daney <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Maciej W. Rozycki <[email protected]>
Cc: Paul Gortmaker <[email protected]>
Cc: Aneesh Kumar K.V <[email protected]>
Cc: Peter Zijlstra (Intel) <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Alex Smith <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: [email protected] # v4.1+
Cc: [email protected]
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/13119/
Signed-off-by: Ralf Baechle <[email protected]>
Diffstat (limited to 'arch/mips/mm/init.c')
| -rw-r--r-- | arch/mips/mm/init.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c index 6c6a843b0d17..134c988bc61f 100644 --- a/arch/mips/mm/init.c +++ b/arch/mips/mm/init.c @@ -98,8 +98,10 @@ static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot) idx += in_interrupt() ? FIX_N_COLOURS : 0; vaddr = __fix_to_virt(FIX_CMAP_END - idx); pte = mk_pte(page, prot); -#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) +#if defined(CONFIG_XPA) entrylo = pte_to_entrylo(pte.pte_high); +#elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) + entrylo = pte.pte_high; #else entrylo = pte_to_entrylo(pte_val(pte)); #endif |