* [xfs-linux:xfs-for-next 29/47] fs/xfs/libxfs/xfs_alloc.c:1170:41: sparse: sparse: Using plain integer as NULL pointer
@ 2019-10-19 20:07 kbuild test robot
2019-10-21 13:14 ` [PATCH] xfs: fix sparse warning on allocation cursor initialization Brian Foster
0 siblings, 1 reply; 3+ messages in thread
From: kbuild test robot @ 2019-10-19 20:07 UTC (permalink / raw)
To: Brian Foster; +Cc: kbuild-all, linux-xfs, Darrick J. Wong
tree: https://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git xfs-for-next
head: 722da94850334abacce34e63c670dcd9c79cad52
commit: aa056ce9548079d6b65c8b4a0d319eadff7dcd1b [29/47] xfs: introduce allocation cursor data structure
reproduce:
# apt-get install sparse
# sparse version: v0.6.1-dirty
git checkout aa056ce9548079d6b65c8b4a0d319eadff7dcd1b
make ARCH=x86_64 allmodconfig
make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>
sparse warnings: (new ones prefixed by >>)
>> fs/xfs/libxfs/xfs_alloc.c:1170:41: sparse: sparse: Using plain integer as NULL pointer
vim +1170 fs/xfs/libxfs/xfs_alloc.c
1159
1160 /*
1161 * Allocate a variable extent near bno in the allocation group agno.
1162 * Extent's length (returned in len) will be between minlen and maxlen,
1163 * and of the form k * prod + mod unless there's nothing that large.
1164 * Return the starting a.g. block, or NULLAGBLOCK if we can't do it.
1165 */
1166 STATIC int
1167 xfs_alloc_ag_vextent_near(
1168 struct xfs_alloc_arg *args)
1169 {
> 1170 struct xfs_alloc_cur acur = {0,};
1171 struct xfs_btree_cur *bno_cur;
1172 xfs_agblock_t gtbno; /* start bno of right side entry */
1173 xfs_agblock_t gtbnoa; /* aligned ... */
1174 xfs_extlen_t gtdiff; /* difference to right side entry */
1175 xfs_extlen_t gtlen; /* length of right side entry */
1176 xfs_extlen_t gtlena; /* aligned ... */
1177 xfs_agblock_t gtnew; /* useful start bno of right side */
1178 int error; /* error code */
1179 int i; /* result code, temporary */
1180 int j; /* result code, temporary */
1181 xfs_agblock_t ltbno; /* start bno of left side entry */
1182 xfs_agblock_t ltbnoa; /* aligned ... */
1183 xfs_extlen_t ltdiff; /* difference to left side entry */
1184 xfs_extlen_t ltlen; /* length of left side entry */
1185 xfs_extlen_t ltlena; /* aligned ... */
1186 xfs_agblock_t ltnew; /* useful start bno of left side */
1187 xfs_extlen_t rlen; /* length of returned extent */
1188 bool busy;
1189 unsigned busy_gen;
1190 #ifdef DEBUG
1191 /*
1192 * Randomly don't execute the first algorithm.
1193 */
1194 int dofirst; /* set to do first algorithm */
1195
1196 dofirst = prandom_u32() & 1;
1197 #endif
1198
1199 /* handle unitialized agbno range so caller doesn't have to */
1200 if (!args->min_agbno && !args->max_agbno)
1201 args->max_agbno = args->mp->m_sb.sb_agblocks - 1;
1202 ASSERT(args->min_agbno <= args->max_agbno);
1203
1204 /* clamp agbno to the range if it's outside */
1205 if (args->agbno < args->min_agbno)
1206 args->agbno = args->min_agbno;
1207 if (args->agbno > args->max_agbno)
1208 args->agbno = args->max_agbno;
1209
1210 restart:
1211 ltlen = 0;
1212 gtlena = 0;
1213 ltlena = 0;
1214 busy = false;
1215
1216 /*
1217 * Set up cursors and see if there are any free extents as big as
1218 * maxlen. If not, pick the last entry in the tree unless the tree is
1219 * empty.
1220 */
1221 error = xfs_alloc_cur_setup(args, &acur);
1222 if (error == -ENOSPC) {
1223 error = xfs_alloc_ag_vextent_small(args, acur.cnt, <bno,
1224 <len, &i);
1225 if (error)
1226 goto out;
1227 if (i == 0 || ltlen == 0) {
1228 trace_xfs_alloc_near_noentry(args);
1229 goto out;
1230 }
1231 ASSERT(i == 1);
1232 } else if (error) {
1233 goto out;
1234 }
1235 args->wasfromfl = 0;
1236
1237 /*
1238 * First algorithm.
1239 * If the requested extent is large wrt the freespaces available
1240 * in this a.g., then the cursor will be pointing to a btree entry
1241 * near the right edge of the tree. If it's in the last btree leaf
1242 * block, then we just examine all the entries in that block
1243 * that are big enough, and pick the best one.
1244 * This is written as a while loop so we can break out of it,
1245 * but we never loop back to the top.
1246 */
1247 while (xfs_btree_islastblock(acur.cnt, 0)) {
1248 xfs_extlen_t bdiff;
1249 int besti=0;
1250 xfs_extlen_t blen=0;
1251 xfs_agblock_t bnew=0;
1252
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH] xfs: fix sparse warning on allocation cursor initialization
2019-10-19 20:07 [xfs-linux:xfs-for-next 29/47] fs/xfs/libxfs/xfs_alloc.c:1170:41: sparse: sparse: Using plain integer as NULL pointer kbuild test robot
@ 2019-10-21 13:14 ` Brian Foster
2019-10-21 15:45 ` Darrick J. Wong
0 siblings, 1 reply; 3+ messages in thread
From: Brian Foster @ 2019-10-21 13:14 UTC (permalink / raw)
To: linux-xfs
sparse complains about the initialization used for the allocation
cursor:
>> fs/xfs/libxfs/xfs_alloc.c:1170:41: sparse: sparse: Using plain integer as NULL pointer
Fix it by removing the unnecessary initialization value.
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Brian Foster <bfoster@redhat.com>
---
fs/xfs/libxfs/xfs_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index e9f74eb92073..925eba9489d5 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -1471,7 +1471,7 @@ STATIC int
xfs_alloc_ag_vextent_near(
struct xfs_alloc_arg *args)
{
- struct xfs_alloc_cur acur = {0,};
+ struct xfs_alloc_cur acur = {};
int error; /* error code */
int i; /* result code, temporary */
xfs_agblock_t bno;
--
2.20.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] xfs: fix sparse warning on allocation cursor initialization
2019-10-21 13:14 ` [PATCH] xfs: fix sparse warning on allocation cursor initialization Brian Foster
@ 2019-10-21 15:45 ` Darrick J. Wong
0 siblings, 0 replies; 3+ messages in thread
From: Darrick J. Wong @ 2019-10-21 15:45 UTC (permalink / raw)
To: Brian Foster; +Cc: linux-xfs
On Mon, Oct 21, 2019 at 09:14:04AM -0400, Brian Foster wrote:
> sparse complains about the initialization used for the allocation
> cursor:
>
> >> fs/xfs/libxfs/xfs_alloc.c:1170:41: sparse: sparse: Using plain integer as NULL pointer
>
> Fix it by removing the unnecessary initialization value.
>
> Reported-by: kbuild test robot <lkp@intel.com>
> Signed-off-by: Brian Foster <bfoster@redhat.com>
Looks ok, though I have to rebase the iomap / xfs branches anyway so I
might apply this to the original patch.
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
--D
> ---
> fs/xfs/libxfs/xfs_alloc.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
> index e9f74eb92073..925eba9489d5 100644
> --- a/fs/xfs/libxfs/xfs_alloc.c
> +++ b/fs/xfs/libxfs/xfs_alloc.c
> @@ -1471,7 +1471,7 @@ STATIC int
> xfs_alloc_ag_vextent_near(
> struct xfs_alloc_arg *args)
> {
> - struct xfs_alloc_cur acur = {0,};
> + struct xfs_alloc_cur acur = {};
> int error; /* error code */
> int i; /* result code, temporary */
> xfs_agblock_t bno;
> --
> 2.20.1
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-10-19 20:07 [xfs-linux:xfs-for-next 29/47] fs/xfs/libxfs/xfs_alloc.c:1170:41: sparse: sparse: Using plain integer as NULL pointer kbuild test robot
2019-10-21 13:14 ` [PATCH] xfs: fix sparse warning on allocation cursor initialization Brian Foster
2019-10-21 15:45 ` Darrick J. Wong
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