Buildresult: powerpc-fixes/ppc64_defconfig+NO_HUGETLB+4K_PAGES/powerpc-gcc9 built on Feb 3 2021, 12:04
kisskb
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Status:
OK
Date/Time:
Feb 3 2021, 12:04
Duration:
0:06:29.745700
Builder:
ka2
Revision:
powerpc/64/signal: Fix regression in __kernel_sigtramp_rt64() semantics (
24321ac668e452a4942598533d267805f291fdc9)
Target:
powerpc-fixes/ppc64_defconfig+NO_HUGETLB+4K_PAGES/powerpc-gcc9
Branch:
powerpc-fixes
Compiler:
powerpc-gcc9
(powerpc64-linux-gcc (GCC) 9.2.0 / GNU ld (GNU Binutils) 2.32)
Config:
ppc64_defconfig+NO_HUGETLB+4K_PAGES
(
download
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Log:
Download original
Possible warnings (1)
.config:4378:warning: override: reassigning to symbol PPC_4K_PAGES
Full Log
# git rev-parse -q --verify 24321ac668e452a4942598533d267805f291fdc9^{commit} 24321ac668e452a4942598533d267805f291fdc9 already have revision, skipping fetch # git checkout -q -f -B kisskb 24321ac668e452a4942598533d267805f291fdc9 # git clean -qxdf # < git log -1 # commit 24321ac668e452a4942598533d267805f291fdc9 # Author: Raoni Fassina Firmino <raoni@linux.ibm.com> # Date: Mon Feb 1 17:05:05 2021 -0300 # # powerpc/64/signal: Fix regression in __kernel_sigtramp_rt64() semantics # # Commit 0138ba5783ae ("powerpc/64/signal: Balance return predictor # stack in signal trampoline") changed __kernel_sigtramp_rt64() VDSO and # trampoline code, and introduced a regression in the way glibc's # backtrace()[1] detects the signal-handler stack frame. Apart from the # practical implications, __kernel_sigtramp_rt64() was a VDSO function # with the semantics that it is a function you can call from userspace # to end a signal handling. Now this semantics are no longer valid. # # I believe the aforementioned change affects all releases since 5.9. # # This patch tries to fix both the semantics and practical aspect of # __kernel_sigtramp_rt64() returning it to the previous code, whilst # keeping the intended behaviour of 0138ba5783ae by adding a new symbol # to serve as the jump target from the kernel to the trampoline. Now the # trampoline has two parts, a new entry point and the old return point. # # [1] https://lists.ozlabs.org/pipermail/linuxppc-dev/2021-January/223194.html # # Fixes: 0138ba5783ae ("powerpc/64/signal: Balance return predictor stack in signal trampoline") # Cc: stable@vger.kernel.org # v5.9+ # Signed-off-by: Raoni Fassina Firmino <raoni@linux.ibm.com> # Acked-by: Nicholas Piggin <npiggin@gmail.com> # [mpe: Minor tweaks to change log formatting, add stable tag] # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # Link: https://lore.kernel.org/r/20210201200505.iz46ubcizipnkcxe@work-tp # < /opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version # < git log --format=%s --max-count=1 24321ac668e452a4942598533d267805f291fdc9 # < make -s -j 8 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+NO_HUGETLB+4K_PAGES_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux- ppc64_defconfig # Added to kconfig CONFIG_PPC_64K_PAGES=n # Added to kconfig CONFIG_PPC_4K_PAGES=y # Added to kconfig CONFIG_HUGETLBFS=n # < make -s -j 8 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+NO_HUGETLB+4K_PAGES_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 8 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+NO_HUGETLB+4K_PAGES_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig .config:4378:warning: override: reassigning to symbol PPC_4K_PAGES # make -s -j 8 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+NO_HUGETLB+4K_PAGES_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux- Completed OK # rm -rf /kisskb/build/powerpc-fixes_ppc64_defconfig+NO_HUGETLB+4K_PAGES_powerpc-gcc9 # Build took: 0:06:29.745700
© Michael Ellerman 2006-2018.