Tejun Heo 4d59b6ccf0 cpumask: use nr_cpumask_bits for parsing functions ... Commit 513e3d2d11 ("cpumask: always use nr_cpu_ids in formatting and parsing functions") converted both cpumask printing and parsing functions to use nr_cpu_ids instead of nr_cpumask_bits. While this was okay for the printing functions as it just picked one of the two output formats that we were alternating between depending on a kernel config, doing the same for parsing wasn't okay. nr_cpumask_bits can be either nr_cpu_ids or NR_CPUS. We can always use nr_cpu_ids but that is a variable while NR_CPUS is a constant, so it can be more efficient to use NR_CPUS when we can get away with it. Converting the printing functions to nr_cpu_ids makes sense because it affects how the masks get presented to userspace and doesn't break anything; however, using nr_cpu_ids for parsing functions can incorrectly leave the higher bits uninitialized while reading in these masks from userland. As all testing and comparison functions use nr_cpumask_bits which can be larger than nr_cpu_ids, the parsed cpumasks can erroneously yield false negative results. This made the taskstats interface incorrectly return -EINVAL even when the inputs were correct. Fix it by restoring the parse functions to use nr_cpumask_bits instead of nr_cpu_ids. Link: http://lkml.kernel.org/r/20170206182442.GB31078@htj.duckdns.org Fixes: 513e3d2d11 ("cpumask: always use nr_cpu_ids in formatting and parsing functions") Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Martin Steigerwald <martin.steigerwald@teamix.de> Debugged-by: Ben Hutchings <ben.hutchings@codethink.co.uk> Cc: <stable@vger.kernel.org> [4.0+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2017-02-08 15:41:43 -08:00
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acpi	More ACPI updates for v4.10-rc1	2016-12-22 10:19:32 -08:00
asm-generic	modversions: treat symbol CRCs as 32 bit quantities	2017-02-03 08:28:25 -08:00
clocksource
crypto	This pull contains one set of changes: a conversion of the crypto DocBook	2016-12-17 16:00:34 -08:00
drm	drm: Don't race connector registration	2017-01-30 10:17:32 +01:00
dt-bindings	dt-bindings: mfd: Remove TPS65217 interrupts	2016-12-27 10:06:00 -08:00
keys
kvm	KVM: arm64: Access CNTHCTL_EL2 bit fields correctly on VHE systems	2017-01-13 11:19:25 +00:00
linux	cpumask: use nr_cpumask_bits for parsing functions	2017-02-08 15:41:43 -08:00
math-emu
media
memory
misc
net	udp: properly cope with csum errors	2017-02-07 11:19:00 -05:00
pcmcia
ras
rdma	RDMA/core: Add the function ib_mtu_int_to_enum	2017-01-24 15:34:22 -05:00
rxrpc
scsi	Merge remote-tracking branch 'mkp-scsi/fixes' into fixes	2017-01-17 17:32:54 -05:00
soc	ARCv2: MCIP: update the BCR per current changes	2017-01-24 11:05:59 -08:00
sound	Merge remote-tracking branches 'asoc/fix/arizona', 'asoc/fix/dpcm', 'asoc/fix/dwc', 'asoc/fix/fsl-ssi' and 'asoc/fix/hdmi-codec' into asoc-linus	2017-01-10 10:47:50 +00:00
target	target: add XCOPY target/segment desc sense codes	2017-01-10 08:40:32 -08:00
trace	Merge branch 'for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2017-01-13 17:40:22 -08:00
uapi	ipv6: sr: remove cleanup flag and fix HMAC computation	2017-02-03 11:05:23 -05:00
video
xen	xen: features and fixes for 4.10 rc0	2016-12-13 16:07:55 -08:00
Kbuild