# 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/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc --version
# < git log --format=%s --max-count=1 8b11ec1b5ffb54f71cb5a5e5c8c4d36e5d113085
# < make -s -j 120 ARCH=arm O=/kisskb/build/linus-rand_arm-randconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-  randconfig
KCONFIG_SEED=0x7446572
# Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y
# yes \n | make -s -j 120 ARCH=arm O=/kisskb/build/linus-rand_arm-randconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-  oldconfig
yes: standard output: Broken pipe
yes: write error
# make -s -j 120 ARCH=arm O=/kisskb/build/linus-rand_arm-randconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-  
<stdin>:1332:2: warning: #warning syscall io_pgetevents not implemented [-Wcpp]
/kisskb/src/arch/arm/kernel/setup.c: In function 'reserve_crashkernel':
/kisskb/src/arch/arm/kernel/setup.c:1004:25: error: 'SECTION_SIZE' undeclared (first use in this function)
/kisskb/src/arch/arm/kernel/setup.c:1004:25: note: each undeclared identifier is reported only once for each function it appears in
/kisskb/src/scripts/Makefile.build:317: recipe for target 'arch/arm/kernel/setup.o' failed
make[2]: *** [arch/arm/kernel/setup.o] Error 1
make[2]: *** Waiting for unfinished jobs....
/kisskb/src/arch/arm/mach-s3c24xx/common.c:140:24: warning: 's3c_iodesc' defined but not used [-Wunused-variable]
/kisskb/src/arch/arm/mach-s3c24xx/s3c244x.c:44:24: warning: 's3c244x_iodesc' defined but not used [-Wunused-variable]
/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/Makefile:1029: recipe for target 'arch/arm/kernel' failed
make[1]: *** [arch/arm/kernel] Error 2
make[1]: *** Waiting for unfinished jobs....
/kisskb/src/drivers/base/regmap/regmap.c: In function '_regmap_raw_write':
/kisskb/src/drivers/base/regmap/regmap.c:1819:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read':
/kisskb/src/drivers/base/regmap/regmap.c:2497:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/connector/connector.c:242:12: warning: 'cn_proc_show' defined but not used [-Wunused-function]
/kisskb/src/drivers/dma-buf/reservation.c: In function 'reservation_object_add_shared_fence':
/kisskb/src/drivers/dma-buf/reservation.c:225:6: warning: 'k' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/mfd/arizona-core.c: In function 'arizona_dev_init':
/kisskb/src/drivers/mfd/arizona-core.c:1404:6: warning: 'n_subdevs' may be used uninitialized in this function [-Wuninitialized]
/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]
/kisskb/src/drivers/iio/temperature/mlx90632.c: In function 'mlx90632_read_raw':
/kisskb/src/drivers/iio/temperature/mlx90632.c:472:39: warning: 'object_old_raw' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/iio/temperature/mlx90632.c:429:56: note: 'object_old_raw' was declared here
/kisskb/src/drivers/iio/temperature/mlx90632.c:472:39: warning: 'object_new_raw' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/iio/temperature/mlx90632.c:429:40: note: 'object_new_raw' was declared here
make[1]: *** wait: No child processes.  Stop.
Makefile:146: recipe for target 'sub-make' failed
make: *** [sub-make] Error 2
Command 'make -s -j 120 ARCH=arm O=/kisskb/build/linus-rand_arm-randconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-  ' returned non-zero exit status 2
# rm -rf /kisskb/build/linus-rand_arm-randconfig_arm
# Build took: 0:00:30.633365