linux/tools
Johannes Weiner 6d75f366b9 lib: radix-tree: check accounting of existing slot replacement users
The bug in khugepaged fixed earlier in this series shows that radix tree
slot replacement is fragile; and it will become more so when not only
NULL<->!NULL transitions need to be caught but transitions from and to
exceptional entries as well.  We need checks.

Re-implement radix_tree_replace_slot() on top of the sanity-checked
__radix_tree_replace().  This requires existing callers to also pass the
radix tree root, but it'll warn us when somebody replaces slots with
contents that need proper accounting (transitions between NULL entries,
real entries, exceptional entries) and where a replacement through the
slot pointer would corrupt the radix tree node counts.

Link: http://lkml.kernel.org/r/20161117193021.GB23430@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Suggested-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox <mawilcox@linuxonhyperv.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-12-12 18:55:08 -08:00
..
accounting tools: move accounting tool from Documentation 2016-09-23 13:07:15 -06:00
arch x86/cpufeature: Add AVX512_4VNNIW and AVX512_4FMAPS features 2016-10-19 17:37:13 +02:00
build perf build: Check LLVM version in feature check 2016-12-06 13:21:55 -03:00
cgroup
firewire
gpio tools/gpio: fix gpio-event-mon header comment 2016-08-08 09:50:22 +02:00
hv tools: hv: Enable network manager for bonding scripts on RHEL 2016-12-06 10:13:55 -05:00
iio Second set of iio new device support, features and cleanups for the 4.9 cycle. 2016-09-14 20:42:03 +02:00
include Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-12-12 11:46:21 -08:00
kvm/kvm_stat
laptop tools: move laptops dslm tool from Documentation 2016-09-23 13:07:21 -06:00
lguest tools/lguest: Don't bork the terminal in case of wrong args 2016-09-08 08:05:24 +02:00
lib tools lib bpf: Retrive bpf_map through offset of bpf_map_def 2016-11-29 12:10:19 -03:00
net
nfsd
objtool objtool: Fix bytes check of lea's rex_prefix 2016-12-06 09:20:59 +01:00
pcmcia tools: move pcmcia crc32hash tool from Documentation 2016-09-23 13:07:27 -06:00
perf perf tools: Explicitly document that --children is enabled by default 2016-12-07 12:00:35 -03:00
power tools/power/acpi: Remove direct kernel source include reference 2016-11-16 22:31:26 +01:00
scripts tools build: Fix objtool build with ARCH=x86_64 2016-07-22 16:37:44 -03:00
spi Merge remote-tracking branches 'spi/topic/ti-qspi', 'spi/topic/tools', 'spi/topic/txx9' and 'spi/topic/xlp' into spi-next 2016-09-30 09:14:22 -07:00
testing lib: radix-tree: check accounting of existing slot replacement users 2016-12-12 18:55:08 -08:00
thermal/tmon
time
usb
virtio ringtest: poll for new buffers once before updating event index 2016-10-31 00:21:43 +02:00
vm tools/vm/page_owner: increase temporary buffer size 2016-07-26 16:19:19 -07:00
Makefile