diff options
Diffstat (limited to 'kernel/arch/arc/mm/fault.c')
| -rw-r--r-- | kernel/arch/arc/mm/fault.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/kernel/arch/arc/mm/fault.c b/kernel/arch/arc/mm/fault.c index d948e4e9d..af63f4a13 100644 --- 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 |