Buildresult: linus/x86_64-allnoconfig/x86_64-gcc4.6 built on Mar 19 2020, 04:10

kisskb

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Status:	OK
Date/Time:	Mar 19 2020, 04:10
Duration:	0:00:22.883657
Builder:	blade4b
Revision:	mm: slub: be more careful about the double cmpxchg of freelist (`5076190daded2197f62fe92cf69674488be44175)`
Target:	linus/x86_64-allnoconfig/x86_64-gcc4.6
Branch:	linus
Compiler:	x86_64-gcc4.6 (x86_64-linux-gcc (GCC) 4.6.3 / GNU ld (GNU Binutils) 2.22)
Config:	allnoconfig (download)
Log:	Download original Possible warnings (3) kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] arch/x86/kernel/apic/io_apic.c:1037:6: warning: 'irq' may be used uninitialized in this function [-Wuninitialized] arch/x86/kernel/e820.c:665:16: warning: 'gapstart' may be used uninitialized in this function [-Wuninitialized] Full Log # git rev-parse -q --verify 5076190daded2197f62fe92cf69674488be44175^{commit} 5076190daded2197f62fe92cf69674488be44175 already have revision, skipping fetch # git checkout -q -f -B kisskb 5076190daded2197f62fe92cf69674488be44175 # git clean -qxdf # < git log -1 # commit 5076190daded2197f62fe92cf69674488be44175 # Author: Linus Torvalds <torvalds@linux-foundation.org> # Date: Tue Mar 17 11:04:09 2020 -0700 # # mm: slub: be more careful about the double cmpxchg of freelist # # This is just a cleanup addition to Jann's fix to properly update the # transaction ID for the slub slowpath in commit fd4d9c7d0c71 ("mm: slub: # add missing TID bump.."). # # The transaction ID is what protects us against any concurrent accesses, # but we should really also make sure to make the 'freelist' comparison # itself always use the same freelist value that we then used as the new # next free pointer. # # Jann points out that if we do all of this carefully, we could skip the # transaction ID update for all the paths that only remove entries from # the lists, and only update the TID when adding entries (to avoid the ABA # issue with cmpxchg and list handling re-adding a previously seen value). # # But this patch just does the "make sure to cmpxchg the same value we # used" rather than then try to be clever. # # Acked-by: Jann Horn <jannh@google.com> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version # < /opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-ld --version # < git log --format=%s --max-count=1 5076190daded2197f62fe92cf69674488be44175 # < make -s -j 24 ARCH=x86_64 O=/kisskb/build/linus_x86_64-allnoconfig_x86_64-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux- allnoconfig # < make -s -j 24 ARCH=x86_64 O=/kisskb/build/linus_x86_64-allnoconfig_x86_64-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux- help # make -s -j 24 ARCH=x86_64 O=/kisskb/build/linus_x86_64-allnoconfig_x86_64-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux- olddefconfig # make -s -j 24 ARCH=x86_64 O=/kisskb/build/linus_x86_64-allnoconfig_x86_64-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux- /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/arch/x86/kernel/apic/io_apic.c: In function 'mp_map_pin_to_irq': /kisskb/src/arch/x86/kernel/apic/io_apic.c:1037:6: warning: 'irq' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/arch/x86/kernel/e820.c: In function 'e820__setup_pci_gap': /kisskb/src/arch/x86/kernel/e820.c:665:16: warning: 'gapstart' may be used uninitialized in this function [-Wuninitialized] Completed OK # rm -rf /kisskb/build/linus_x86_64-allnoconfig_x86_64-gcc4.6 # Build took: 0:00:22.883657

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