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authorNoam Camus <noamca@mellanox.com>2016-10-11 13:51:35 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-11 15:06:30 -0700
commit2d13e6ca429c0a6fbc82750acbece829facceec5 (patch)
treeaa08bbe948f9949a346a9f2b0a125e933cbfd854 /lib/md5.c
parent8cfd56d4790423499d03f09f8584e0c6de494ec7 (diff)
downloadlinux-2d13e6ca429c0a6fbc82750acbece829facceec5.tar.bz2
lib/bitmap.c: enhance bitmap syntax
Today there are platforms with many CPUs (up to 4K). Trying to boot only part of the CPUs may result in too long string. For example lets take NPS platform that is part of arch/arc. This platform have SMP system with 256 cores each with 16 HW threads (SMT machine) where HW thread appears as CPU to the kernel. In this example there is total of 4K CPUs. When one tries to boot only part of the HW threads from each core the string representing the map may be long... For example if for sake of performance we decided to boot only first half of HW threads of each core the map will look like: 0-7,16-23,32-39,...,4080-4087 This patch introduce new syntax to accommodate with such use case. I added an optional postfix to a range of CPUs which will choose according to given modulo the desired range of reminders i.e.: <cpus range>:sed_size/group_size For example, above map can be described in new syntax like this: 0-4095:8/16 Note that this patch is backward compatible with current syntax. [akpm@linux-foundation.org: rework documentation] Link: http://lkml.kernel.org/r/1473579629-4283-1-git-send-email-noamca@mellanox.com Signed-off-by: Noam Camus <noamca@mellanox.com> Cc: David Decotigny <decot@googlers.com> Cc: Ben Hutchings <ben@decadent.org.uk> Cc: David S. Miller <davem@davemloft.net> Cc: Pan Xinhui <xinhui@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/md5.c')
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