These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / arc / mm / fault.c

diff --git a/kernel/arch/arc/mm/fault.c b/kernel/arch/arc/mm/fault.c
index d948e4e..af63f4a 100644 (file)
--- a/kernel/arch/arc/mm/fault.c
+++ b/kernel/arch/arc/mm/fault.c
@@ -18,7 +18,14 @@
 #include <asm/pgalloc.h>
 #include <asm/mmu.h>
 
-static int handle_vmalloc_fault(unsigned long address)
+/*
+ * kernel virtual address is required to implement vmalloc/pkmap/fixmap
+ * Refer to asm/processor.h for System Memory Map
+ *
+ * It simply copies the PMD entry (pointer to 2nd level page table or hugepage)
+ * from swapper pgdir to task pgdir. The 2nd level table/page is thus shared
+ */
+noinline static int handle_kernel_vaddr_fault(unsigned long address)
 {
        /*
         * Synchronize this task's top level page-table
@@ -72,8 +79,8 @@ void do_page_fault(unsigned long address, struct pt_regs *regs)
         * only copy the information from the master page table,
         * nothing more.
         */
-       if (address >= VMALLOC_START && address <= VMALLOC_END) {
-               ret = handle_vmalloc_fault(address);
+       if (address >= VMALLOC_START) {
+               ret = handle_kernel_vaddr_fault(address);
                if (unlikely(ret))
                        goto bad_area_nosemaphore;
                else