Buildresult: linus/ia64-defconfig/ia64-gcc4.6 built on Aug 2 2018, 08:50

kisskb

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Status:	OK
Date/Time:	Aug 2 2018, 08:50
Duration:	0:02:16.408050
Builder:	ka4
Revision:	mm: do not initialize TLB stack vma's with vma_init() (`8b11ec1b5ffb54f71cb5a5e5c8c4d36e5d113085)`
Target:	linus/ia64-defconfig/ia64-gcc4.6
Branch:	linus
Compiler:	ia64-gcc4.6 (ia64-linux-gcc (GCC) 4.6.3)
Config:	defconfig (download)
Log:	Download original Possible warnings (17) <stdin>:1185:2: warning: #warning syscall perf_event_open not implemented [-Wcpp] <stdin>:1239:2: warning: #warning syscall seccomp not implemented [-Wcpp] <stdin>:1317:2: warning: #warning syscall pkey_mprotect not implemented [-Wcpp] <stdin>:1320:2: warning: #warning syscall pkey_alloc not implemented [-Wcpp] <stdin>:1323:2: warning: #warning syscall pkey_free not implemented [-Wcpp] <stdin>:1326:2: warning: #warning syscall statx not implemented [-Wcpp] <stdin>:1332:2: warning: #warning syscall io_pgetevents not implemented [-Wcpp] <stdin>:1335:2: warning: #warning syscall rseq not implemented [-Wcpp] kernel/cgroup/cgroup-v1.c:1256:20: warning: 'root' may be used uninitialized in this function [-Wuninitialized] kernel/printk/printk.c:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] mm/vmstat.c:89:5: warning: 'oldval' may be used uninitialized in this function [-Wuninitialized] kernel/fork.c:723:13: warning: 'task_struct_whitelist' defined but not used [-Wunused-function] mm/hugetlb.c:1433:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized] fs/nfsd/nfs4xdr.c:2046:9: warning: 'str' may be used uninitialized in this function [-Wuninitialized] drivers/dma-buf/reservation.c:207:2: warning: 'k' may be used uninitialized in this function [-Wuninitialized] include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] fs/udf/unicode.c:132:8: warning: 'c' may be used uninitialized in this function [-Wuninitialized] Full Log # git rev-parse -q --verify 8b11ec1b5ffb54f71cb5a5e5c8c4d36e5d113085^{commit} 8b11ec1b5ffb54f71cb5a5e5c8c4d36e5d113085 already have revision, skipping fetch # git checkout -q -f -B kisskb 8b11ec1b5ffb54f71cb5a5e5c8c4d36e5d113085 # git clean -qxdf # < git log -1 # commit 8b11ec1b5ffb54f71cb5a5e5c8c4d36e5d113085 # Author: Linus Torvalds <torvalds@linux-foundation.org> # Date: Wed Aug 1 13:43:38 2018 -0700 # # mm: do not initialize TLB stack vma's with vma_init() # # Commit 2c4541e24c55 ("mm: use vma_init() to initialize VMAs on stack and # data segments") tried to initialize various left-over ad-hoc vma's # "properly", but actually made things worse for the temporary vma's used # for TLB flushing. # # vma_init() doesn't actually initialize all of the vma, just a few # fields, so doing something like # # - struct vm_area_struct vma = { .vm_mm = tlb->mm, }; # + struct vm_area_struct vma; # + # + vma_init(&vma, tlb->mm); # # was actually very bad: instead of having a nicely initialized vma with # every field but "vm_mm" zeroed, you'd have an entirely uninitialized vma # with only a couple of fields initialized. And they weren't even fields # that the code in question mostly cared about. # # The flush_tlb_range() function takes a "struct vma" rather than a # "struct mm_struct", because a few architectures actually care about what # kind of range it is - being able to only do an ITLB flush if it's a # range that doesn't have data accesses enabled, for example. And all the # normal users already have the vma for doing the range invalidation. # # But a few people want to call flush_tlb_range() with a range they just # made up, so they also end up using a made-up vma. x86 just has a # special "flush_tlb_mm_range()" function for this, but other # architectures (arm and ia64) do the "use fake vma" thing instead, and # thus got caught up in the vma_init() changes. # # At the same time, the TLB flushing code really doesn't care about most # other fields in the vma, so vma_init() is just unnecessary and # pointless. # # This fixes things by having an explicit "this is just an initializer for # the TLB flush" initializer macro, which is used by the arm/arm64/ia64 # people who mis-use this interface with just a dummy vma. # # Fixes: 2c4541e24c55 ("mm: use vma_init() to initialize VMAs on stack and data segments") # Cc: Dmitry Vyukov <dvyukov@google.com> # Cc: Oleg Nesterov <oleg@redhat.com> # Cc: Andrea Arcangeli <aarcange@redhat.com> # Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> # Cc: Andrew Morton <akpm@linux-foundation.org> # Cc: John Stultz <john.stultz@linaro.org> # Cc: Hugh Dickins <hughd@google.com> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/gcc-4.6.3-nolibc/ia64-linux/bin/ia64-linux-gcc --version # < git log --format=%s --max-count=1 8b11ec1b5ffb54f71cb5a5e5c8c4d36e5d113085 # < make -s -j 10 ARCH=ia64 O=/kisskb/build/linus_ia64-defconfig_ia64 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/ia64-linux/bin/ia64-linux- defconfig # make -s -j 10 ARCH=ia64 O=/kisskb/build/linus_ia64-defconfig_ia64 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/ia64-linux/bin/ia64-linux- <stdin>:1185:2: warning: #warning syscall perf_event_open not implemented [-Wcpp] <stdin>:1239:2: warning: #warning syscall seccomp not implemented [-Wcpp] <stdin>:1317:2: warning: #warning syscall pkey_mprotect not implemented [-Wcpp] <stdin>:1320:2: warning: #warning syscall pkey_alloc not implemented [-Wcpp] <stdin>:1323:2: warning: #warning syscall pkey_free not implemented [-Wcpp] <stdin>:1326:2: warning: #warning syscall statx not implemented [-Wcpp] <stdin>:1332:2: warning: #warning syscall io_pgetevents not implemented [-Wcpp] <stdin>:1335:2: warning: #warning syscall rseq not implemented [-Wcpp] /kisskb/src/kernel/cgroup/cgroup-v1.c: In function 'cgroup1_mount': /kisskb/src/kernel/cgroup/cgroup-v1.c:1256:20: warning: 'root' may be used uninitialized in this function [-Wuninitialized] /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/mm/vmstat.c: In function 'sysctl_vm_numa_stat_handler': /kisskb/src/mm/vmstat.c:89:5: warning: 'oldval' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/kernel/fork.c:723:13: warning: 'task_struct_whitelist' defined but not used [-Wunused-function] /kisskb/src/mm/hugetlb.c: In function 'alloc_pool_huge_page': /kisskb/src/mm/hugetlb.c:1433:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/nfsd/nfs4xdr.c: In function 'nfsd4_encode_components_esc': /kisskb/src/fs/nfsd/nfs4xdr.c:2046:9: warning: 'str' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/dma-buf/reservation.c: In function 'reservation_object_add_shared_fence': /kisskb/src/drivers/dma-buf/reservation.c:207:2: warning: 'k' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/dma-buf/reservation.c:160:17: note: 'k' was declared here /kisskb/src/fs/proc/inode.c: In function 'proc_reg_open': /kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/proc/inode.c:339:21: note: 'pdeo' was declared here /kisskb/src/fs/udf/unicode.c: In function 'udf_name_conv_char': /kisskb/src/fs/udf/unicode.c:132:8: warning: 'c' may be used uninitialized in this function [-Wuninitialized] No errors detected in 21114 functions. Kernel: vmlinux.gz is ready Completed OK # rm -rf /kisskb/build/linus_ia64-defconfig_ia64 # Build took: 0:02:16.408050

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