Buildresult: linus/generic-32bit_defconfig/parisc-gcc8 built on Sep 22 2021, 13:21

kisskb

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Status:	OK
Date/Time:	Sep 22 2021, 13:21
Duration:	0:01:08.715266
Builder:	ka7
Revision:	qnx4: work around gcc false positive warning bug (`d5f6545934c47e97c0b48a645418e877b452a992)`
Target:	linus/generic-32bit_defconfig/parisc-gcc8
Branch:	linus
Compiler:	parisc-gcc8 (hppa-linux-gcc (GCC) 8.1.0 / GNU ld (GNU Binutils) 2.30)
Config:	generic-32bit_defconfig (download)
Log:	Download original Possible warnings (3) block/genhd.c:1169:1: warning: the frame size of 1672 bytes is larger than 1536 bytes [-Wframe-larger-than=] drivers/scsi/ncr53c8xx.c:8000:26: warning: 'retrieve_from_waiting_list' defined but not used [-Wunused-function] lib/xxhash.c:236:1: warning: the frame size of 1616 bytes is larger than 1536 bytes [-Wframe-larger-than=] Full Log # git rev-parse -q --verify d5f6545934c47e97c0b48a645418e877b452a992^{commit} d5f6545934c47e97c0b48a645418e877b452a992 already have revision, skipping fetch # git checkout -q -f -B kisskb d5f6545934c47e97c0b48a645418e877b452a992 # git clean -qxdf # < git log -1 # commit d5f6545934c47e97c0b48a645418e877b452a992 # Author: Linus Torvalds <torvalds@linux-foundation.org> # Date: Mon Sep 20 10:26:21 2021 -0700 # # qnx4: work around gcc false positive warning bug # # In commit b7213ffa0e58 ("qnx4: avoid stringop-overread errors") I tried # to teach gcc about how the directory entry structure can be two # different things depending on a status flag. It made the code clearer, # and it seemed to make gcc happy. # # However, Arnd points to a gcc bug, where despite using two different # members of a union, gcc then gets confused, and uses the size of one of # the members to decide if a string overrun happens. And not necessarily # the rigth one. # # End result: with some configurations, gcc-11 will still complain about # the source buffer size being overread: # # fs/qnx4/dir.c: In function 'qnx4_readdir': # fs/qnx4/dir.c:76:32: error: 'strnlen' specified bound [16, 48] exceeds source size 1 [-Werror=stringop-overread] # 76 \| size = strnlen(name, size); # \| ^~~~~~~~~~~~~~~~~~~ # fs/qnx4/dir.c:26:22: note: source object declared here # 26 \| char de_name; # \| ^~~~~~~ # # because gcc will get confused about which union member entry is actually # getting accessed, even when the source code is very clear about it. Gcc # internally will have combined two "redundant" pointers (pointing to # different union elements that are at the same offset), and takes the # size checking from one or the other - not necessarily the right one. # # This is clearly a gcc bug, but we can work around it fairly easily. The # biggest thing here is the big honking comment about why we do what we # do. # # Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578#c6 # Reported-and-tested-by: Arnd Bergmann <arnd@kernel.org> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/hppa-linux/bin/hppa-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/hppa-linux/bin/hppa-linux-ld --version # < git log --format=%s --max-count=1 d5f6545934c47e97c0b48a645418e877b452a992 # < make -s -j 32 ARCH=parisc O=/kisskb/build/linus_generic-32bit_defconfig_parisc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/hppa-linux/bin/hppa-linux- generic-32bit_defconfig # < make -s -j 32 ARCH=parisc O=/kisskb/build/linus_generic-32bit_defconfig_parisc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/hppa-linux/bin/hppa-linux- help # make -s -j 32 ARCH=parisc O=/kisskb/build/linus_generic-32bit_defconfig_parisc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/hppa-linux/bin/hppa-linux- olddefconfig # make -s -j 32 ARCH=parisc O=/kisskb/build/linus_generic-32bit_defconfig_parisc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/hppa-linux/bin/hppa-linux- /kisskb/src/block/genhd.c: In function 'diskstats_show': /kisskb/src/block/genhd.c:1169:1: warning: the frame size of 1672 bytes is larger than 1536 bytes [-Wframe-larger-than=] } ^ /kisskb/src/drivers/scsi/ncr53c8xx.c:8000:26: warning: 'retrieve_from_waiting_list' defined but not used [-Wunused-function] static struct scsi_cmnd retrieve_from_waiting_list(int to_remove, struct ncb np, struct scsi_cmnd *cmd) ^~~~~~~~~~~~~~~~~~~~~~~~~~ /kisskb/src/lib/xxhash.c: In function 'xxh64': /kisskb/src/lib/xxhash.c:236:1: warning: the frame size of 1616 bytes is larger than 1536 bytes [-Wframe-larger-than=] } ^ Completed OK # rm -rf /kisskb/build/linus_generic-32bit_defconfig_parisc-gcc8 # Build took: 0:01:08.715266

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