Buildresult: linus/ip32_defconfig/mips-gcc4.6 built on Apr 6 2018, 10:04

kisskb

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Status:	Failed
Date/Time:	Apr 6 2018, 10:04
Duration:	0:01:08.445689
Builder:	ka1
Revision:	kernel.h: Retain constant expression output for max()/min() (`3c8ba0d61d04ced9f8d9ff93977995a9e4e96e91)`
Target:	linus/ip32_defconfig/mips-gcc4.6
Branch:	linus
Compiler:	mips-gcc4.6 (mips-linux-gcc (GCC) 4.6.3)
Config:	ip32_defconfig (download)
Log:	Download original Possible errors make[1]: * [vmlinux] Error 1 make: * [sub-make] Error 2 Possible warnings (2) kernel/printk/printk.c:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] drivers/tty/serial/8250/8250_core.c:251:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized] Full Log # git rev-parse -q --verify 3c8ba0d61d04ced9f8d9ff93977995a9e4e96e91^{commit} 3c8ba0d61d04ced9f8d9ff93977995a9e4e96e91 already have revision, skipping fetch # git checkout -q -f -B kisskb 3c8ba0d61d04ced9f8d9ff93977995a9e4e96e91 # git clean -qxdf # < git log -1 # commit 3c8ba0d61d04ced9f8d9ff93977995a9e4e96e91 # Author: Kees Cook <keescook@chromium.org> # Date: Fri Mar 30 18:52:36 2018 -0700 # # kernel.h: Retain constant expression output for max()/min() # # In the effort to remove all VLAs from the kernel[1], it is desirable to # build with -Wvla. However, this warning is overly pessimistic, in that # it is only happy with stack array sizes that are declared as constant # expressions, and not constant values. One case of this is the # evaluation of the max() macro which, due to its construction, ends up # converting constant expression arguments into a constant value result. # # All attempts to rewrite this macro with __builtin_constant_p() failed # with older compilers (e.g. gcc 4.4)[2]. However, Martin Uecker, # constructed[3] a mind-shattering solution that works everywhere. # Cthulhu fhtagn! # # This patch updates the min()/max() macros to evaluate to a constant # expression when called on constant expression arguments. This removes # several false-positive stack VLA warnings from an x86 allmodconfig build # when -Wvla is added: # # $ diff -u before.txt after.txt \| grep ^- # -drivers/input/touchscreen/cyttsp4_core.c:871:2: warning: ISO C90 forbids variable length array ‘ids’ [-Wvla] # -fs/btrfs/tree-checker.c:344:4: warning: ISO C90 forbids variable length array ‘namebuf’ [-Wvla] # -lib/vsprintf.c:747:2: warning: ISO C90 forbids variable length array ‘sym’ [-Wvla] # -net/ipv4/proc.c:403:2: warning: ISO C90 forbids variable length array ‘buff’ [-Wvla] # -net/ipv6/proc.c:198:2: warning: ISO C90 forbids variable length array ‘buff’ [-Wvla] # -net/ipv6/proc.c:218:2: warning: ISO C90 forbids variable length array ‘buff64’ [-Wvla] # # This also updates two cases where different enums were being compared # and explicitly casts them to int (which matches the old side-effect of # the single-evaluation code): one in tpm/tpm_tis_core.h, and one in # drm/drm_color_mgmt.c. # # [1] https://lkml.org/lkml/2018/3/7/621 # [2] https://lkml.org/lkml/2018/3/10/170 # [3] https://lkml.org/lkml/2018/3/20/845 # # Co-Developed-by: Linus Torvalds <torvalds@linux-foundation.org> # Co-Developed-by: Martin Uecker <Martin.Uecker@med.uni-goettingen.de> # Signed-off-by: Kees Cook <keescook@chromium.org> # Acked-by: Ingo Molnar <mingo@kernel.org> # Acked-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-gcc --version # < git log --format=%s --max-count=1 3c8ba0d61d04ced9f8d9ff93977995a9e4e96e91 # < make -s -j 8 ARCH=mips O=/kisskb/build/linus_ip32_defconfig_mips CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux- ip32_defconfig # make -s -j 8 ARCH=mips O=/kisskb/build/linus_ip32_defconfig_mips CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux- /kisskb/src/arch/mips/vdso/Makefile:32: MIPS VDSO requires binutils >= 2.25 /kisskb/src/arch/mips/vdso/Makefile:32: MIPS VDSO requires binutils >= 2.25 /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq': /kisskb/src/drivers/tty/serial/8250/8250_core.c:251:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/tty/serial/8250/8250_core.c:231:19: note: 'i' was declared here lib/lib.a: could not read symbols: No more archived files /kisskb/src/Makefile:1038: recipe for target 'vmlinux' failed make[1]: * [vmlinux] Error 1 Makefile:146: recipe for target 'sub-make' failed make: * [sub-make] Error 2 Command 'make -s -j 8 ARCH=mips O=/kisskb/build/linus_ip32_defconfig_mips CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux- ' returned non-zero exit status 2 # rm -rf /kisskb/build/linus_ip32_defconfig_mips # Build took: 0:01:08.445689

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