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Date: Mon, 28 Jun 2021 09:42:17 +0200
From: Ilya Dryomov <idryomov@...il.com>
To: kernel test robot <lkp@...el.com>
Cc: kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: net/ceph/messenger_v1.c:1204:5: warning: stack frame size (2880)
exceeds limit (2048) in function 'ceph_con_v1_try_read'
On Mon, Jun 28, 2021 at 7:16 AM kernel test robot <lkp@...el.com> wrote:
>
> Hi Ilya,
>
> FYI, the error/warning still remains.
We won't be fixing the stack frame size warning here. Please add it to the
allowlist.
Thanks,
Ilya
>
> 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@...el.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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