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SubjectRe: [PATCH 2/3] libnvdimm: nd_region flush callback support
Hi Pankaj,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linux-nvdimm/libnvdimm-for-next]
[also build test WARNING on v4.19-rc2 next-20180831]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Pankaj-Gupta/kvm-fake-DAX-device/20180903-160032
base: https://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm.git libnvdimm-for-next
reproduce:
# apt-get install sparse
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__
:::::: branch date: 7 hours ago
:::::: commit date: 7 hours ago

drivers/nvdimm/pmem.c:116:25: sparse: expression using sizeof(void)
drivers/nvdimm/pmem.c:135:25: sparse: expression using sizeof(void)
>> drivers/nvdimm/pmem.c:204:32: sparse: incorrect type in assignment (different base types) @@ expected restricted blk_status_t [usertype] bi_status @@ got e] bi_status @@
drivers/nvdimm/pmem.c:204:32: expected restricted blk_status_t [usertype] bi_status
drivers/nvdimm/pmem.c:204:32: got int
drivers/nvdimm/pmem.c:208:9: sparse: expression using sizeof(void)
drivers/nvdimm/pmem.c:208:9: sparse: expression using sizeof(void)
include/linux/bvec.h:82:37: sparse: expression using sizeof(void)
include/linux/bvec.h:82:37: sparse: expression using sizeof(void)
include/linux/bvec.h:83:32: sparse: expression using sizeof(void)
include/linux/bvec.h:83:32: sparse: expression using sizeof(void)
drivers/nvdimm/pmem.c:220:32: sparse: incorrect type in assignment (different base types) @@ expected restricted blk_status_t [usertype] bi_status @@ got e] bi_status @@
drivers/nvdimm/pmem.c:220:32: expected restricted blk_status_t [usertype] bi_status
drivers/nvdimm/pmem.c:220:32: got int

# https://github.com/0day-ci/linux/commit/69b95edd2a1f4676361988fa36866b59427e2cfa
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout 69b95edd2a1f4676361988fa36866b59427e2cfa
vim +204 drivers/nvdimm/pmem.c

59e647398 drivers/nvdimm/pmem.c Dan Williams 2016-03-08 107
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 108 static void write_pmem(void *pmem_addr, struct page *page,
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 109 unsigned int off, unsigned int len)
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 110 {
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 111 unsigned int chunk;
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 112 void *mem;
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 113
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 114 while (len) {
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 115 mem = kmap_atomic(page);
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 @116 chunk = min_t(unsigned int, len, PAGE_SIZE);
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 117 memcpy_flushcache(pmem_addr, mem + off, chunk);
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 118 kunmap_atomic(mem);
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 119 len -= chunk;
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 120 off = 0;
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 121 page++;
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 122 pmem_addr += PAGE_SIZE;
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 123 }
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 124 }
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 125
4e4cbee93 drivers/nvdimm/pmem.c Christoph Hellwig 2017-06-03 126 static blk_status_t read_pmem(struct page *page, unsigned int off,
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 127 void *pmem_addr, unsigned int len)
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 128 {
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 129 unsigned int chunk;
60622d682 drivers/nvdimm/pmem.c Dan Williams 2018-05-03 130 unsigned long rem;
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 131 void *mem;
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 132
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 133 while (len) {
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 134 mem = kmap_atomic(page);
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 135 chunk = min_t(unsigned int, len, PAGE_SIZE);
60622d682 drivers/nvdimm/pmem.c Dan Williams 2018-05-03 136 rem = memcpy_mcsafe(mem + off, pmem_addr, chunk);
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 137 kunmap_atomic(mem);
60622d682 drivers/nvdimm/pmem.c Dan Williams 2018-05-03 138 if (rem)
4e4cbee93 drivers/nvdimm/pmem.c Christoph Hellwig 2017-06-03 139 return BLK_STS_IOERR;
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 140 len -= chunk;
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 141 off = 0;
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 142 page++;
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 143 pmem_addr += PAGE_SIZE;
98cc093cb drivers/nvdimm/pmem.c Huang Ying 2017-09-06 144 }
4e4cbee93 drivers/nvdimm/pmem.c Christoph Hellwig 2017-06-03 145 return BLK_STS_OK;
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 146 }
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 147
4e4cbee93 drivers/nvdimm/pmem.c Christoph Hellwig 2017-06-03 148 static blk_status_t pmem_do_bvec(struct pmem_device *pmem, struct page *page,
3f289dcb4 drivers/nvdimm/pmem.c Tejun Heo 2018-07-18 149 unsigned int len, unsigned int off, unsigned int op,
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 150 sector_t sector)
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 151 {
4e4cbee93 drivers/nvdimm/pmem.c Christoph Hellwig 2017-06-03 152 blk_status_t rc = BLK_STS_OK;
59e647398 drivers/nvdimm/pmem.c Dan Williams 2016-03-08 153 bool bad_pmem = false;
32ab0a3f5 drivers/nvdimm/pmem.c Dan Williams 2015-08-01 154 phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
7a9eb2066 drivers/nvdimm/pmem.c Dan Williams 2016-06-03 155 void *pmem_addr = pmem->virt_addr + pmem_off;
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 156
e10624f8c drivers/nvdimm/pmem.c Dan Williams 2016-01-06 157 if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
59e647398 drivers/nvdimm/pmem.c Dan Williams 2016-03-08 158 bad_pmem = true;
59e647398 drivers/nvdimm/pmem.c Dan Williams 2016-03-08 159
3f289dcb4 drivers/nvdimm/pmem.c Tejun Heo 2018-07-18 160 if (!op_is_write(op)) {
59e647398 drivers/nvdimm/pmem.c Dan Williams 2016-03-08 161 if (unlikely(bad_pmem))
4e4cbee93 drivers/nvdimm/pmem.c Christoph Hellwig 2017-06-03 162 rc = BLK_STS_IOERR;
b5ebc8ec6 drivers/nvdimm/pmem.c Dan Williams 2016-03-06 163 else {
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 164 rc = read_pmem(page, off, pmem_addr, len);
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 165 flush_dcache_page(page);
b5ebc8ec6 drivers/nvdimm/pmem.c Dan Williams 2016-03-06 166 }
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 167 } else {
0a370d261 drivers/nvdimm/pmem.c Dan Williams 2016-04-14 168 /*
0a370d261 drivers/nvdimm/pmem.c Dan Williams 2016-04-14 169 * Note that we write the data both before and after
0a370d261 drivers/nvdimm/pmem.c Dan Williams 2016-04-14 170 * clearing poison. The write before clear poison
0a370d261 drivers/nvdimm/pmem.c Dan Williams 2016-04-14 171 * handles situations where the latest written data is
0a370d261 drivers/nvdimm/pmem.c Dan Williams 2016-04-14 172 * preserved and the clear poison operation simply marks
0a370d261 drivers/nvdimm/pmem.c Dan Williams 2016-04-14 173 * the address range as valid without changing the data.
0a370d261 drivers/nvdimm/pmem.c Dan Williams 2016-04-14 174 * In this case application software can assume that an
0a370d261 drivers/nvdimm/pmem.c Dan Williams 2016-04-14 175 * interrupted write will either return the new good
0a370d261 drivers/nvdimm/pmem.c Dan Williams 2016-04-14 176 * data or an error.
0a370d261 drivers/nvdimm/pmem.c Dan Williams 2016-04-14 177 *
0a370d261 drivers/nvdimm/pmem.c Dan Williams 2016-04-14 178 * However, if pmem_clear_poison() leaves the data in an
0a370d261 drivers/nvdimm/pmem.c Dan Williams 2016-04-14 179 * indeterminate state we need to perform the write
0a370d261 drivers/nvdimm/pmem.c Dan Williams 2016-04-14 180 * after clear poison.
0a370d261 drivers/nvdimm/pmem.c Dan Williams 2016-04-14 181 */
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 182 flush_dcache_page(page);
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 183 write_pmem(pmem_addr, page, off, len);
59e647398 drivers/nvdimm/pmem.c Dan Williams 2016-03-08 184 if (unlikely(bad_pmem)) {
3115bb02b drivers/nvdimm/pmem.c Toshi Kani 2016-10-13 185 rc = pmem_clear_poison(pmem, pmem_off, len);
bd697a80c drivers/nvdimm/pmem.c Vishal Verma 2016-09-30 186 write_pmem(pmem_addr, page, off, len);
59e647398 drivers/nvdimm/pmem.c Dan Williams 2016-03-08 187 }
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 188 }
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 189
b5ebc8ec6 drivers/nvdimm/pmem.c Dan Williams 2016-03-06 190 return rc;
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 191 }
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 192
dece16353 drivers/nvdimm/pmem.c Jens Axboe 2015-11-05 193 static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio)
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 194 {
4e4cbee93 drivers/nvdimm/pmem.c Christoph Hellwig 2017-06-03 195 blk_status_t rc = 0;
f0dc089ce drivers/nvdimm/pmem.c Dan Williams 2015-05-16 196 bool do_acct;
f0dc089ce drivers/nvdimm/pmem.c Dan Williams 2015-05-16 197 unsigned long start;
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 198 struct bio_vec bvec;
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 199 struct bvec_iter iter;
bd842b8ca drivers/nvdimm/pmem.c Dan Williams 2016-03-18 200 struct pmem_device *pmem = q->queuedata;
7e267a8c7 drivers/nvdimm/pmem.c Dan Williams 2016-06-01 201 struct nd_region *nd_region = to_region(pmem);
7e267a8c7 drivers/nvdimm/pmem.c Dan Williams 2016-06-01 202
d2d6364dc drivers/nvdimm/pmem.c Ross Zwisler 2018-06-06 203 if (bio->bi_opf & REQ_PREFLUSH)
69b95edd2 drivers/nvdimm/pmem.c Pankaj Gupta 2018-08-31 @204 bio->bi_status = nd_region->flush(nd_region);
69b95edd2 drivers/nvdimm/pmem.c Pankaj Gupta 2018-08-31 205
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 206
f0dc089ce drivers/nvdimm/pmem.c Dan Williams 2015-05-16 207 do_acct = nd_iostat_start(bio, &start);
e10624f8c drivers/nvdimm/pmem.c Dan Williams 2016-01-06 208 bio_for_each_segment(bvec, bio, iter) {
e10624f8c drivers/nvdimm/pmem.c Dan Williams 2016-01-06 209 rc = pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len,
3f289dcb4 drivers/nvdimm/pmem.c Tejun Heo 2018-07-18 210 bvec.bv_offset, bio_op(bio), iter.bi_sector);
e10624f8c drivers/nvdimm/pmem.c Dan Williams 2016-01-06 211 if (rc) {
4e4cbee93 drivers/nvdimm/pmem.c Christoph Hellwig 2017-06-03 212 bio->bi_status = rc;
e10624f8c drivers/nvdimm/pmem.c Dan Williams 2016-01-06 213 break;
e10624f8c drivers/nvdimm/pmem.c Dan Williams 2016-01-06 214 }
e10624f8c drivers/nvdimm/pmem.c Dan Williams 2016-01-06 215 }
f0dc089ce drivers/nvdimm/pmem.c Dan Williams 2015-05-16 216 if (do_acct)
f0dc089ce drivers/nvdimm/pmem.c Dan Williams 2015-05-16 217 nd_iostat_end(bio, start);
61031952f drivers/nvdimm/pmem.c Ross Zwisler 2015-06-25 218
1eff9d322 drivers/nvdimm/pmem.c Jens Axboe 2016-08-05 219 if (bio->bi_opf & REQ_FUA)
69b95edd2 drivers/nvdimm/pmem.c Pankaj Gupta 2018-08-31 220 bio->bi_status = nd_region->flush(nd_region);
61031952f drivers/nvdimm/pmem.c Ross Zwisler 2015-06-25 221
4246a0b63 drivers/nvdimm/pmem.c Christoph Hellwig 2015-07-20 222 bio_endio(bio);
dece16353 drivers/nvdimm/pmem.c Jens Axboe 2015-11-05 223 return BLK_QC_T_NONE;
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 224 }
9e853f231 drivers/block/pmem.c Ross Zwisler 2015-04-01 225

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