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| author | Vineet Gupta <vgupta@synopsys.com> | 2015-03-05 12:36:31 +0100 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2015-10-28 15:01:05 +0100 |
| commit | 336e2136e1353db8e9e731c27381ee0735656a8a (patch) | |
| tree | e386405627b5e1f68f04a1d4f854f3121b913d45 /arch/arc/mm/fault.c | |
| parent | ARC: mm: use generic macros _BITUL()/_AC() (diff) | |
| download | linux-336e2136e1353db8e9e731c27381ee0735656a8a.tar.xz linux-336e2136e1353db8e9e731c27381ee0735656a8a.zip | |
ARC: mm: preps ahead of HIGHMEM support
Before we plug in highmem support, some of code needs to be ready for it
- copy_user_highpage() needs to be using the kmap_atomic API
- mk_pte() can't assume page_address()
- do_page_fault() can't assume VMALLOC_END is end of kernel vaddr space
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/mm/fault.c')
| -rw-r--r-- | arch/arc/mm/fault.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/arc/mm/fault.c b/arch/arc/mm/fault.c index d948e4e9d89c..af63f4a13e60 100644 --- a/arch/arc/mm/fault.c +++ b/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 |