linux/arch/powerpc
Eric Dumazet aee636c480 bpf: do not use reciprocal divide
At first Jakub Zawadzki noticed that some divisions by reciprocal_divide
were not correct. (off by one in some cases)
http://www.wireshark.org/~darkjames/reciprocal-buggy.c

He could also show this with BPF:
http://www.wireshark.org/~darkjames/set-and-dump-filter-k-bug.c

The reciprocal divide in linux kernel is not generic enough,
lets remove its use in BPF, as it is not worth the pain with
current cpus.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Jakub Zawadzki <darkjames-ws@darkjames.pl>
Cc: Mircea Gherzan <mgherzan@gmail.com>
Cc: Daniel Borkmann <dxchgb@gmail.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Matt Evans <matt@ozlabs.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-15 17:02:08 -08:00
..
boot powerpc/512x: dts: disable MPC5125 usb module 2013-12-20 22:12:07 +01:00
configs powerpc/52xx: Re-enable bestcomm driver in defconfigs 2013-12-10 11:25:08 +11:00
crypto
include Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-12-30 10:22:57 -08:00
kernel Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-12-30 10:22:57 -08:00
kvm KVM: PPC: Book3S HV: Don't drop low-order page address bits 2013-12-18 11:30:35 +01:00
lib powerpc: Make 64-bit non-VMX __copy_tofrom_user bi-endian 2013-12-30 14:02:30 +11:00
math-emu
mm powerpc/booke: Only check for hugetlb in flush if vma != NULL 2013-11-22 16:57:29 -06:00
net bpf: do not use reciprocal divide 2014-01-15 17:02:08 -08:00
oprofile Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-09-06 10:49:42 -07:00
perf powerpc/perf: Fix handling of FAB events 2013-10-03 17:25:38 +10:00
platforms powernv/eeh: Add buffer for P7IOC hub error data 2013-12-30 14:02:32 +11:00
sysdev powerpc/44x: Fix ocm_block allocation 2013-12-10 11:25:04 +11:00
xmon powerpc/xmon: Fix printing of set of CPUs in xmon 2013-09-05 17:29:19 +10:00
Kconfig Kconfig cleanups for v3.13 2013-11-15 14:05:15 -08:00
Kconfig.debug
Makefile powerpc: Fix error when cross building TAGS & cscope 2013-11-25 11:49:11 +11:00
relocs_check.pl