drivers/media/test-drivers/vidtv/vidtv_psi.c:1457:31: warning: taking address of packed member 'bitfield' of class or structure 'vidtv_psi_table_nit' may result in an unaligned pointer value

From: kernel test robot
Date: Thu Jan 14 2021 - 14:02:04 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 65f0d2414b7079556fbbcc070b3d1c9f9587606d
commit: c2f78f0cb294aa6f009d3a170f4ee8ad199ba5da media: vidtv: psi: add a Network Information Table (NIT)
date: 7 weeks ago
config: mips-randconfig-r026-20210114 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 68ff52ffead2ba25cca442778ab19286000daad7)
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 mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c2f78f0cb294aa6f009d3a170f4ee8ad199ba5da
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout c2f78f0cb294aa6f009d3a170f4ee8ad199ba5da
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips

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

All warnings (new ones prefixed by >>):

In file included from include/linux/preempt.h:78:
In file included from ./arch/mips/include/generated/asm/preempt.h:1:
In file included from include/asm-generic/preempt.h:5:
In file included from include/linux/thread_info.h:38:
In file included from arch/mips/include/asm/thread_info.h:16:
In file included from arch/mips/include/asm/processor.h:14:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:52:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/atomic.h:45:9: note: expanded from macro 'ATOMIC_OPS'
return xchg(&v->counter, n); \
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/media/test-drivers/vidtv/vidtv_psi.c:16:
In file included from include/linux/slab.h:15:
In file included from include/linux/gfp.h:6:
In file included from include/linux/mmzone.h:8:
In file included from include/linux/spinlock.h:51:
In file included from include/linux/preempt.h:78:
In file included from ./arch/mips/include/generated/asm/preempt.h:1:
In file included from include/asm-generic/preempt.h:5:
In file included from include/linux/thread_info.h:38:
In file included from arch/mips/include/asm/thread_info.h:16:
In file included from arch/mips/include/asm/processor.h:14:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:257:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_SIP_OP(atomic, int, subu, ll, sc)
^
arch/mips/include/asm/atomic.h:251:7: note: expanded from macro 'ATOMIC_SIP_OP'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/media/test-drivers/vidtv/vidtv_psi.c:16:
In file included from include/linux/slab.h:15:
In file included from include/linux/gfp.h:6:
In file included from include/linux/mmzone.h:8:
In file included from include/linux/spinlock.h:51:
In file included from include/linux/preempt.h:78:
In file included from ./arch/mips/include/generated/asm/preempt.h:1:
In file included from include/asm-generic/preempt.h:5:
In file included from include/linux/thread_info.h:38:
In file included from arch/mips/include/asm/thread_info.h:16:
In file included from arch/mips/include/asm/processor.h:14:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:261:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_SIP_OP(atomic64, s64, dsubu, lld, scd)
^
arch/mips/include/asm/atomic.h:251:7: note: expanded from macro 'ATOMIC_SIP_OP'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/media/test-drivers/vidtv/vidtv_psi.c:16:
In file included from include/linux/slab.h:15:
In file included from include/linux/gfp.h:6:
In file included from include/linux/mmzone.h:8:
In file included from include/linux/spinlock.h:59:
In file included from include/linux/lockdep.h:14:
In file included from include/linux/smp.h:15:
In file included from include/linux/smp_types.h:5:
include/linux/llist.h:222:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
return xchg(&head->first, NULL);
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/media/test-drivers/vidtv/vidtv_psi.c:16:
In file included from include/linux/slab.h:15:
In file included from include/linux/gfp.h:6:
In file included from include/linux/mmzone.h:8:
In file included from include/linux/spinlock.h:59:
In file included from include/linux/lockdep.h:27:
include/linux/debug_locks.h:17:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
return xchg(&debug_locks, 0);
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
drivers/media/test-drivers/vidtv/vidtv_psi.c:753:31: warning: taking address of packed member 'bitfield2' of class or structure 'vidtv_psi_table_pmt' may result in an unaligned pointer value [-Waddress-of-packed-member]
vidtv_psi_set_desc_loop_len(&pmt->bitfield2, desc_loop_len, 10);
^~~~~~~~~~~~~~
drivers/media/test-drivers/vidtv/vidtv_psi.c:764:32: warning: taking address of packed member 'bitfield2' of class or structure 'vidtv_psi_table_pmt_stream' may result in an unaligned pointer value [-Waddress-of-packed-member]
vidtv_psi_set_desc_loop_len(&s->bitfield2, desc_loop_len, 10);
^~~~~~~~~~~~
drivers/media/test-drivers/vidtv/vidtv_psi.c:796:32: warning: taking address of packed member 'bitfield' of class or structure 'vidtv_psi_table_sdt_service' may result in an unaligned pointer value [-Waddress-of-packed-member]
vidtv_psi_set_desc_loop_len(&s->bitfield, desc_loop_len, 12);
^~~~~~~~~~~
>> drivers/media/test-drivers/vidtv/vidtv_psi.c:1457:31: warning: taking address of packed member 'bitfield' of class or structure 'vidtv_psi_table_nit' may result in an unaligned pointer value [-Waddress-of-packed-member]
vidtv_psi_set_desc_loop_len(&nit->bitfield, desc_loop_len, 12);
^~~~~~~~~~~~~
>> drivers/media/test-drivers/vidtv/vidtv_psi.c:1472:32: warning: taking address of packed member 'bitfield' of class or structure 'vidtv_psi_table_transport' may result in an unaligned pointer value [-Waddress-of-packed-member]
vidtv_psi_set_desc_loop_len(&t->bitfield, desc_loop_len, 12);
^~~~~~~~~~~
>> drivers/media/test-drivers/vidtv/vidtv_psi.c:1480:31: warning: taking address of packed member 'bitfield2' of class or structure 'vidtv_psi_table_nit' may result in an unaligned pointer value [-Waddress-of-packed-member]
vidtv_psi_set_desc_loop_len(&nit->bitfield2, transport_loop_len, 12);
^~~~~~~~~~~~~~
drivers/media/test-drivers/vidtv/vidtv_psi.c:92:19: warning: unused function 'vidtv_psi_sdt_serv_get_desc_loop_len' [-Wunused-function]
static inline u16 vidtv_psi_sdt_serv_get_desc_loop_len(struct vidtv_psi_table_sdt_service *s)
^
drivers/media/test-drivers/vidtv/vidtv_psi.c:103:19: warning: unused function 'vidtv_psi_pmt_stream_get_desc_loop_len' [-Wunused-function]
static inline u16 vidtv_psi_pmt_stream_get_desc_loop_len(struct vidtv_psi_table_pmt_stream *s)
^
drivers/media/test-drivers/vidtv/vidtv_psi.c:114:19: warning: unused function 'vidtv_psi_pmt_get_desc_loop_len' [-Wunused-function]
static inline u16 vidtv_psi_pmt_get_desc_loop_len(struct vidtv_psi_table_pmt *p)
^
19 warnings generated.

vim +1457 drivers/media/test-drivers/vidtv/vidtv_psi.c

1442
1443 static void vidtv_psi_nit_table_update_sec_len(struct vidtv_psi_table_nit *nit)
1444 {
1445 u16 length = 0;
1446 struct vidtv_psi_table_transport *t = nit->transport;
1447 u16 desc_loop_len;
1448 u16 transport_loop_len = 0;
1449
1450 /*
1451 * from immediately after 'section_length' until
1452 * 'network_descriptor_length'
1453 */
1454 length += NIT_LEN_UNTIL_NETWORK_DESCRIPTOR_LEN;
1455
1456 desc_loop_len = vidtv_psi_desc_comp_loop_len(nit->descriptor);
> 1457 vidtv_psi_set_desc_loop_len(&nit->bitfield, desc_loop_len, 12);
1458
1459 length += desc_loop_len;
1460
1461 length += sizeof_field(struct vidtv_psi_table_nit, bitfield2);
1462
1463 while (t) {
1464 /* skip both pointers at the end */
1465 transport_loop_len += sizeof(struct vidtv_psi_table_transport) -
1466 sizeof(struct vidtv_psi_desc *) -
1467 sizeof(struct vidtv_psi_table_transport *);
1468
1469 length += transport_loop_len;
1470
1471 desc_loop_len = vidtv_psi_desc_comp_loop_len(t->descriptor);
> 1472 vidtv_psi_set_desc_loop_len(&t->bitfield, desc_loop_len, 12);
1473
1474 length += desc_loop_len;
1475
1476 t = t->next;
1477 }
1478
1479 // Actually sets the transport stream loop len, maybe rename this function later
> 1480 vidtv_psi_set_desc_loop_len(&nit->bitfield2, transport_loop_len, 12);
1481 length += CRC_SIZE_IN_BYTES;
1482
1483 vidtv_psi_set_sec_len(&nit->header, length);
1484 }
1485

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

Attachment: .config.gz
Description: application/gzip

Next message: Jiri Olsa: "Re: [PATCH v6] perf stat: Fix wrong skipping for per-die aggregation"
Previous message: Masahiro Yamada: "Re: [PATCH] scripts: kconfig: fix HOSTCC call"
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