# 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/sh4-linux/bin/sh4-linux-gcc --version
# < git log --format=%s --max-count=1 8b11ec1b5ffb54f71cb5a5e5c8c4d36e5d113085
# < make -s -j 48 ARCH=sh O=/kisskb/build/linus_se7722_defconfig_sh4 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux-  se7722_defconfig
# make -s -j 48 ARCH=sh O=/kisskb/build/linus_se7722_defconfig_sh4 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux-  
  Generating include/generated/machtypes.h
<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/arch/sh/kernel/cpu/sh4/../sh3/../../entry-common.S: Assembler messages:
/kisskb/src/arch/sh/kernel/cpu/sh4/../sh3/../../entry-common.S:389: Warning: overflow in branch to syscall_exit_work; converted into longer instruction sequence
/kisskb/src/arch/sh/kernel/cpu/sh4/../sh3/../../entry-common.S:392: Warning: overflow in branch to syscall_exit_work; converted into longer instruction sequence
/kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:127:33: warning: 'levelspread[<Uc280>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:94:6: note: 'levelspread[<Uc280>]' was declared here
/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/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/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/drivers/sh/clk/cpg.c: In function 'r8':
/kisskb/src/drivers/sh/clk/cpg.c:41:2: warning: passing argument 1 of 'ioread8' discards 'const' qualifier from pointer target type [enabled by default]
/kisskb/src/include/asm-generic/iomap.h:29:21: note: expected 'void *' but argument is of type 'const void *'
/kisskb/src/drivers/sh/clk/cpg.c: In function 'r16':
/kisskb/src/drivers/sh/clk/cpg.c:46:2: warning: passing argument 1 of 'ioread16' discards 'const' qualifier from pointer target type [enabled by default]
/kisskb/src/include/asm-generic/iomap.h:30:21: note: expected 'void *' but argument is of type 'const void *'
/kisskb/src/drivers/sh/clk/cpg.c: In function 'r32':
/kisskb/src/drivers/sh/clk/cpg.c:51:2: warning: passing argument 1 of 'ioread32' discards 'const' qualifier from pointer target type [enabled by default]
/kisskb/src/include/asm-generic/iomap.h:32:21: note: expected 'void *' but argument is of type 'const void *'
  Kernel: arch/sh/boot/zImage is ready
Completed OK
# rm -rf /kisskb/build/linus_se7722_defconfig_sh4
# Build took: 0:00:31.941765