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| author |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2019-04-23 10:53:21 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2019-04-23 16:30:04 +0200 |
| commit | 1a42010cdc26bb7e5912984f3c91b8c6d55f089a (patch) | |
| tree | c4833720d9fce9ec9c7fdc3d1de59ed585bfd2fb /arch/s390/include/asm/pgtable.h | |
| parent | s390/mm: make the pxd_offset functions more robust (diff) | |
| download | linux-dev-1a42010cdc26bb7e5912984f3c91b8c6d55f089a.tar.xz linux-dev-1a42010cdc26bb7e5912984f3c91b8c6d55f089a.zip | |
s390/mm: convert to the generic get_user_pages_fast code
Define the gup_fast_permitted to check against the asce_limit of the
mm attached to the current task, then replace the s390 specific gup
code with the generic implementation in mm/gup.c.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/pgtable.h')
| -rw-r--r-- | arch/s390/include/asm/pgtable.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index d48be9c27df9..394bec31cb97 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -1265,6 +1265,18 @@ static inline pte_t *pte_offset(pmd_t *pmd, unsigned long address) #define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address) #define pte_unmap(pte) do { } while (0) +static inline bool gup_fast_permitted(unsigned long start, int nr_pages) +{ + unsigned long len, end; + + len = (unsigned long) nr_pages << PAGE_SHIFT; + end = start + len; + if (end < start) + return false; + return end <= current->mm->context.asce_limit; +} +#define gup_fast_permitted gup_fast_permitted + #define pfn_pte(pfn,pgprot) mk_pte_phys(__pa((pfn) << PAGE_SHIFT),(pgprot)) #define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT) #define pte_page(x) pfn_to_page(pte_pfn(x)) |