In v4.8 when we have vmalloc() based nfit_test the test configuration no longer requires a CMA allocation. While we're updating the document, also refresh the configuration variables. Reported-by: Yigal Korman <yigal(a)plexistor.com&gt; Signed-off-by: Dan Williams <dan.j.williams(a)intel.com&gt; --- README.md | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/README.md b/README.md index 76f93dafe4cb..a3def786f188 100644 --- a/README.md +++ b/README.md @@ -26,19 +26,25 @@ loaded. To build and install nfit_test.ko: `git clone -b libnvdimm-for-next git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm.git` -2. Configure the kernel to make some memory available to CMA (contiguous - memory allocator). -This will be used to emulate DAX. +2. Skip to step 3 if the kernel version is >= v4.8. Otherwise, for + kernel versions < v4.8, configure the kernel to make some memory + available to CMA (contiguous memory allocator). This will be used to + emulate DAX. `CONFIG_DMA_CMA=y` `CONFIG_CMA_SIZE_MBYTES=200` **or** `cma=200M` on the kernel command line. -3. Compile all components of the libnvdimm sub-system as modules: +3. Compile the libnvdimm sub-system as a module, make sure "zone device" + memory is enabled, and enable the btt, pfn, and dax features of the + sub-system: +`CONFIG_ZONE_DEVICE=y` `CONFIG_LIBNVDIMM=m` `CONFIG_BLK_DEV_PMEM=m` `CONFIG_ND_BLK=m` -`CONFIG_ND_BTT=m` +`CONFIG_BTT=y` +`CONFIG_NVDIMM_PFN=y` +`CONFIG_NVDIMM_DAX=y` 4. Build and install the unit test enabled libnvdimm modules in the following order. The unit test modules need to be in place prior to