From: Huaisheng Ye <yehs1@xxxxxxxxxx> Changes since v1 [1]: * Collect Jan's reviewed-by. * According to Dan's suggestion, update the unit test infrastructure tools/testing/nvdimm/pmem-dax.c for checking the validity of gfn. [1]: https://lkml.org/lkml/2018/7/4/81 --- Some functions within fs/dax don't need to get gfn from direct_access. Assigning NULL to gfn of dax_direct_access is more intuitive and simple than offering a useless local variable. So all direct_access need to check the validity of pointer pfn for NULL assignment. If pfn equals to NULL, it doesn't need to calculate its value. --- Huaisheng Ye (4): nvdimm/pmem: check the validity of the pointer pfn nvdimm/pmem-dax: check the validity of the pointer pfn s390/block/dcssblk: check the validity of the pointer pfn fs/dax: Assign NULL to gfn of dax_direct_access if useless drivers/nvdimm/pmem.c | 3 ++- drivers/s390/block/dcssblk.c | 3 ++- fs/dax.c | 9 +++------ tools/testing/nvdimm/pmem-dax.c | 6 ++++-- 4 files changed, 11 insertions(+), 10 deletions(-) -- 1.8.3.1
