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Message-ID: <202506182044.OhyWGCSm-lkp@intel.com>
Date: Wed, 18 Jun 2025 21:14:53 +0800
From: kernel test robot <lkp@...el.com>
To: Ian Rogers <irogers@...gle.com>, Eric Biggers <ebiggers@...gle.com>,
Yuzhuo Jing <yuzhuo@...gle.com>, Andy Lutomirski <luto@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Vincenzo Frascino <vincenzo.frascino@....com>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Al Viro <viro@...iv.linux.org.uk>,
Christophe Leroy <christophe.leroy@...roup.eu>,
"Jason A. Donenfeld" <Jason@...c4.com>,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH v2 1/3] vdso: Switch get/put unaligned from packed struct
to memcpy
Hi Ian,
kernel test robot noticed the following build warnings:
[auto build test WARNING on linus/master]
[also build test WARNING on v6.16-rc2 next-20250618]
[cannot apply to tip/timers/vdso acme/perf/core]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Ian-Rogers/vdso-Switch-get-put-unaligned-from-packed-struct-to-memcpy/20250618-045610
base: linus/master
patch link: https://lore.kernel.org/r/20250617205320.1580946-2-irogers%40google.com
patch subject: [PATCH v2 1/3] vdso: Switch get/put unaligned from packed struct to memcpy
config: parisc-allnoconfig (https://download.01.org/0day-ci/archive/20250618/202506182044.OhyWGCSm-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250618/202506182044.OhyWGCSm-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202506182044.OhyWGCSm-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from include/linux/swab.h:5,
from include/uapi/linux/byteorder/big_endian.h:14,
from include/linux/byteorder/big_endian.h:5,
from arch/parisc/include/uapi/asm/byteorder.h:5,
from arch/parisc/include/asm/bitops.h:11,
from include/linux/bitops.h:67,
from include/linux/kernel.h:23,
from arch/parisc/include/asm/bug.h:5,
from include/linux/bug.h:5,
from include/linux/thread_info.h:13,
from include/linux/sched.h:14,
from include/linux/uaccess.h:9,
from arch/parisc/boot/compressed/misc.c:7:
In function 'get_unaligned_le32',
inlined from 'decompress_kernel' at arch/parisc/boot/compressed/misc.c:312:16:
>> include/vdso/unaligned.h:30:9: warning: '__builtin_memcpy' reading 4 bytes from a region of size 1 [-Wstringop-overread]
30 | __builtin_memcpy(&__get_unaligned_val, (void *)(ptr), \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
31 | sizeof(__get_unaligned_val)); \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/uapi/linux/swab.h:120:19: note: in definition of macro '__swab32'
120 | __fswab32(x))
| ^
include/linux/byteorder/generic.h:89:21: note: in expansion of macro '__le32_to_cpu'
89 | #define le32_to_cpu __le32_to_cpu
| ^~~~~~~~~~~~~
include/linux/unaligned.h:23:28: note: in expansion of macro '__get_unaligned_t'
23 | return le32_to_cpu(__get_unaligned_t(__le32, p));
| ^~~~~~~~~~~~~~~~~
arch/parisc/boot/compressed/misc.c: In function 'decompress_kernel':
arch/parisc/boot/compressed/misc.c:29:13: note: source object 'output_len' of size 1
29 | extern char output_len;
| ^~~~~~~~~~
vim +/__builtin_memcpy +30 include/vdso/unaligned.h
4
5 #define ____get_unaligned_type(type) type: (type)0
6 /**
7 * __get_unaligned_t - read an unaligned value from memory.
8 * @ptr: the pointer to load from.
9 * @type: the type to load from the pointer.
10 *
11 * Use memcpy to affect an unaligned type sized load avoiding undefined behavior
12 * from approaches like type punning that require -fno-strict-aliasing in order
13 * to be correct. As type may be const, use _Generic to map to a non-const type
14 * - you can't memcpy into a const type. The void* cast silences ubsan warnings.
15 */
16 #define __get_unaligned_t(type, ptr) ({ \
17 type __get_unaligned_map_ctrl = 0; \
18 typeof(_Generic(__get_unaligned_map_ctrl, \
19 ____get_unaligned_type(short int), \
20 ____get_unaligned_type(unsigned short int), \
21 ____get_unaligned_type(int), \
22 ____get_unaligned_type(unsigned int), \
23 ____get_unaligned_type(long), \
24 ____get_unaligned_type(unsigned long), \
25 ____get_unaligned_type(long long), \
26 ____get_unaligned_type(unsigned long long), \
27 default: (type)0 \
28 )) __get_unaligned_val; \
29 (void)__get_unaligned_map_ctrl; \
> 30 __builtin_memcpy(&__get_unaligned_val, (void *)(ptr), \
31 sizeof(__get_unaligned_val)); \
32 __get_unaligned_val; \
33 })
34
--
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https://github.com/intel/lkp-tests/wiki
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