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Subjectnet/ceph/messenger_v1.c:1204:5: warning: stack frame size (2880) exceeds limit (2048) in function 'ceph_con_v1_try_read'
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 62fb9874f5da54fdb243003b386128037319b219
commit: 2f713615ddd9d805b6c5e79c52e0e11af99d2bf1 libceph: move msgr1 protocol implementation to its own file
date: 7 months ago
config: powerpc64-randconfig-r034-20210628 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 59558129276098d62046c8cda92240d292cbfb1c)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install powerpc64 cross compiling tool for clang build
# apt-get install binutils-powerpc64-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2f713615ddd9d805b6c5e79c52e0e11af99d2bf1
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 2f713615ddd9d805b6c5e79c52e0e11af99d2bf1
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

__do_insb
^
arch/powerpc/include/asm/io.h:541:56: note: expanded from macro '__do_insb'
#define __do_insb(p, b, n) readsb((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from net/ceph/messenger_v1.c:8:
In file included from include/net/sock.h:38:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:604:
arch/powerpc/include/asm/io-defs.h:45:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(insw, (unsigned long p, void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:246:1: note: expanded from here
__do_insw
^
arch/powerpc/include/asm/io.h:542:56: note: expanded from macro '__do_insw'
#define __do_insw(p, b, n) readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from net/ceph/messenger_v1.c:8:
In file included from include/net/sock.h:38:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:604:
arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:250:1: note: expanded from here
__do_insl
^
arch/powerpc/include/asm/io.h:543:56: note: expanded from macro '__do_insl'
#define __do_insl(p, b, n) readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from net/ceph/messenger_v1.c:8:
In file included from include/net/sock.h:38:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:604:
arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:254:1: note: expanded from here
__do_outsb
^
arch/powerpc/include/asm/io.h:544:58: note: expanded from macro '__do_outsb'
#define __do_outsb(p, b, n) writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from net/ceph/messenger_v1.c:8:
In file included from include/net/sock.h:38:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:604:
arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:4:1: note: expanded from here
__do_outsw
^
arch/powerpc/include/asm/io.h:545:58: note: expanded from macro '__do_outsw'
#define __do_outsw(p, b, n) writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from net/ceph/messenger_v1.c:8:
In file included from include/net/sock.h:38:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:604:
arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:8:1: note: expanded from here
__do_outsl
^
arch/powerpc/include/asm/io.h:546:58: note: expanded from macro '__do_outsl'
#define __do_outsl(p, b, n) writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
~~~~~~~~~~~~~~~~~~~~~^
>> net/ceph/messenger_v1.c:1204:5: warning: stack frame size (2880) exceeds limit (2048) in function 'ceph_con_v1_try_read' [-Wframe-larger-than]
int ceph_con_v1_try_read(struct ceph_connection *con)
^
14 warnings generated.


vim +/ceph_con_v1_try_read +1204 net/ceph/messenger_v1.c

1200
1201 /*
1202 * Read what we can from the socket.
1203 */
> 1204 int ceph_con_v1_try_read(struct ceph_connection *con)
1205 {
1206 int ret = -1;
1207
1208 more:
1209 dout("try_read start %p state %d\n", con, con->state);
1210 if (con->state != CEPH_CON_S_V1_BANNER &&
1211 con->state != CEPH_CON_S_V1_CONNECT_MSG &&
1212 con->state != CEPH_CON_S_OPEN)
1213 return 0;
1214
1215 BUG_ON(!con->sock);
1216
1217 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
1218 con->in_base_pos);
1219
1220 if (con->state == CEPH_CON_S_V1_BANNER) {
1221 ret = read_partial_banner(con);
1222 if (ret <= 0)
1223 goto out;
1224 ret = process_banner(con);
1225 if (ret < 0)
1226 goto out;
1227
1228 con->state = CEPH_CON_S_V1_CONNECT_MSG;
1229
1230 /*
1231 * Received banner is good, exchange connection info.
1232 * Do not reset out_kvec, as sending our banner raced
1233 * with receiving peer banner after connect completed.
1234 */
1235 ret = prepare_write_connect(con);
1236 if (ret < 0)
1237 goto out;
1238 prepare_read_connect(con);
1239
1240 /* Send connection info before awaiting response */
1241 goto out;
1242 }
1243
1244 if (con->state == CEPH_CON_S_V1_CONNECT_MSG) {
1245 ret = read_partial_connect(con);
1246 if (ret <= 0)
1247 goto out;
1248 ret = process_connect(con);
1249 if (ret < 0)
1250 goto out;
1251 goto more;
1252 }
1253
1254 WARN_ON(con->state != CEPH_CON_S_OPEN);
1255
1256 if (con->in_base_pos < 0) {
1257 /*
1258 * skipping + discarding content.
1259 */
1260 ret = ceph_tcp_recvmsg(con->sock, NULL, -con->in_base_pos);
1261 if (ret <= 0)
1262 goto out;
1263 dout("skipped %d / %d bytes\n", ret, -con->in_base_pos);
1264 con->in_base_pos += ret;
1265 if (con->in_base_pos)
1266 goto more;
1267 }
1268 if (con->in_tag == CEPH_MSGR_TAG_READY) {
1269 /*
1270 * what's next?
1271 */
1272 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
1273 if (ret <= 0)
1274 goto out;
1275 dout("try_read got tag %d\n", (int)con->in_tag);
1276 switch (con->in_tag) {
1277 case CEPH_MSGR_TAG_MSG:
1278 prepare_read_message(con);
1279 break;
1280 case CEPH_MSGR_TAG_ACK:
1281 prepare_read_ack(con);
1282 break;
1283 case CEPH_MSGR_TAG_KEEPALIVE2_ACK:
1284 prepare_read_keepalive_ack(con);
1285 break;
1286 case CEPH_MSGR_TAG_CLOSE:
1287 ceph_con_close_socket(con);
1288 con->state = CEPH_CON_S_CLOSED;
1289 goto out;
1290 default:
1291 goto bad_tag;
1292 }
1293 }
1294 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
1295 ret = read_partial_message(con);
1296 if (ret <= 0) {
1297 switch (ret) {
1298 case -EBADMSG:
1299 con->error_msg = "bad crc/signature";
1300 fallthrough;
1301 case -EBADE:
1302 ret = -EIO;
1303 break;
1304 case -EIO:
1305 con->error_msg = "io error";
1306 break;
1307 }
1308 goto out;
1309 }
1310 if (con->in_tag == CEPH_MSGR_TAG_READY)
1311 goto more;
1312 ceph_con_process_message(con);
1313 if (con->state == CEPH_CON_S_OPEN)
1314 prepare_read_tag(con);
1315 goto more;
1316 }
1317 if (con->in_tag == CEPH_MSGR_TAG_ACK ||
1318 con->in_tag == CEPH_MSGR_TAG_SEQ) {
1319 /*
1320 * the final handshake seq exchange is semantically
1321 * equivalent to an ACK
1322 */
1323 ret = read_partial_ack(con);
1324 if (ret <= 0)
1325 goto out;
1326 process_ack(con);
1327 goto more;
1328 }
1329 if (con->in_tag == CEPH_MSGR_TAG_KEEPALIVE2_ACK) {
1330 ret = read_keepalive_ack(con);
1331 if (ret <= 0)
1332 goto out;
1333 goto more;
1334 }
1335
1336 out:
1337 dout("try_read done on %p ret %d\n", con, ret);
1338 return ret;
1339
1340 bad_tag:
1341 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
1342 con->error_msg = "protocol error, garbage tag";
1343 ret = -1;
1344 goto out;
1345 }
1346

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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