memblock, nobootmem: add memblock_virt_alloc_low()

The new memblock_virt APIs are used to replaced old bootmem API.

We need to allocate page below 4G for swiotlb.

That should fix regression on Andrew's system that is using swiotlb.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h
index 2fae55def608..b388223bd4a9 100644
--- a/include/linux/bootmem.h
+++ b/include/linux/bootmem.h
@@ -175,6 +175,27 @@ static inline void * __init memblock_virt_alloc_nopanic(
                                                     NUMA_NO_NODE);
 }
 
+#ifndef ARCH_LOW_ADDRESS_LIMIT
+#define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
+#endif
+
+static inline void * __init memblock_virt_alloc_low(
+                                        phys_addr_t size, phys_addr_t align)
+{
+        return memblock_virt_alloc_try_nid(size, align,
+                                                   BOOTMEM_LOW_LIMIT,
+                                                   ARCH_LOW_ADDRESS_LIMIT,
+                                                   NUMA_NO_NODE);
+}
+static inline void * __init memblock_virt_alloc_low_nopanic(
+                                        phys_addr_t size, phys_addr_t align)
+{
+        return memblock_virt_alloc_try_nid_nopanic(size, align,
+                                                   BOOTMEM_LOW_LIMIT,
+                                                   ARCH_LOW_ADDRESS_LIMIT,
+                                                   NUMA_NO_NODE);
+}
+
 static inline void * __init memblock_virt_alloc_from_nopanic(
                 phys_addr_t size, phys_addr_t align, phys_addr_t min_addr)
 {
@@ -238,6 +259,22 @@ static inline void * __init memblock_virt_alloc_nopanic(
         return __alloc_bootmem_nopanic(size, align, BOOTMEM_LOW_LIMIT);
 }
 
+static inline void * __init memblock_virt_alloc_low(
+                                        phys_addr_t size, phys_addr_t align)
+{
+        if (!align)
+                align = SMP_CACHE_BYTES;
+        return __alloc_bootmem_low(size, align, BOOTMEM_LOW_LIMIT);
+}
+
+static inline void * __init memblock_virt_alloc_low_nopanic(
+                                        phys_addr_t size, phys_addr_t align)
+{
+        if (!align)
+                align = SMP_CACHE_BYTES;
+        return __alloc_bootmem_low_nopanic(size, align, BOOTMEM_LOW_LIMIT);
+}
+
 static inline void * __init memblock_virt_alloc_from_nopanic(
                 phys_addr_t size, phys_addr_t align, phys_addr_t min_addr)
 {