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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 Samsung Clock fixes for 3.13-rc7 2014-01-05 21:36:43 -08:00
common Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2013-11-20 13:20:24 -08:00
configs ARM: multi_v7_defconfig: enable SDHCI_BCM_KONA and MMC_BLOCK_MINORS=16 2013-12-03 12:39:14 -08:00
crypto CRYPTO: Fix more AES build errors 2014-01-05 13:59:56 +00:00
include ARM: 7933/1: rename ioremap_cached to ioremap_cache 2014-01-05 14:00:01 +00:00
kernel ARM: fix "bad mode in ... handler" message for undefined instructions 2014-01-05 14:00:00 +00:00
kvm Fix percpu vmalloc allocations 2013-11-19 10:43:05 +02:00
lib ARM: 7907/1: lib: delay-loop: Add align directive to fix BogoMIPS calculation 2013-11-30 22:21:03 +00:00
mach-at91 ARM: SoC fixes for 3.13-rc 2013-12-04 08:56:18 -08:00
mach-bcm BCM changes for 3.13/soc. A number of cleanup related changes. 2013-10-30 14:03:39 -07:00
mach-bcm2835 Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-11-12 10:02:59 +09:00
mach-clps711x
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mach-cns3xxx
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mach-davinci This pull request includes a patch 2013-12-04 14:28:26 -08:00
mach-dove ARM: driver updates for 3.13 2013-11-11 17:05:37 +09:00
mach-ebsa110
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mach-ep93xx usb: ohci: remove ep93xx bus glue platform driver 2013-10-29 16:43:37 -07:00
mach-exynos ACPI and power management updates for 3.13-rc1 2013-11-14 13:41:48 +09:00
mach-footbridge ARM: fix footbridge clockevent device 2013-12-29 12:41:20 +00:00
mach-gemini GPIO bulk changes for the v3.13 development cycle 2013-11-12 15:50:46 +09:00
mach-highbank ARM: highbank: handle soft poweroff and reset key events 2013-12-04 09:28:50 -08:00
mach-imx Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2013-11-18 15:50:07 -08:00
mach-integrator Few clock fixes, a runtime PM fix, and pinctrl-single fix along 2013-11-15 15:17:59 -08:00
mach-iop13xx dmaengine: remove DMA unmap from drivers 2013-11-14 11:04:38 -08:00
mach-iop32x
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mach-iop33x
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mach-ixp4xx Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2013-11-14 08:51:29 +09:00
mach-keystone DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
mach-kirkwood Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2013-11-18 15:50:07 -08:00
mach-ks8695
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mach-lpc32xx
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mach-mmp fbdev changes for 3.13 2013-11-14 14:44:20 +09:00
mach-msm Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-11-12 10:36:00 +09:00
mach-mv78xx0
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mach-mvebu
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mach-mxs ARM: SoC DT updates for 3.13 2013-11-11 17:34:56 +09:00
mach-netx
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mach-nomadik
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mach-nspire
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mach-omap1 Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2013-11-18 15:50:07 -08:00
mach-omap2 A few OMAP hwmod fixes for v3.13-rc. One patch fixes some IRQ 2013-12-27 09:51:25 -08:00
mach-orion5x
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mach-picoxcell
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mach-prima2
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mach-pxa ARM: pxa: fix USB gadget driver compilation regression 2013-12-28 15:18:34 -08:00
mach-realview
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mach-rockchip ARM: SoC board updates for 3.13 2013-11-11 16:57:16 +09:00
mach-rpc
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mach-s3c24xx Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2013-11-18 15:50:07 -08:00
mach-s3c64xx ARM: s3c64xx: dt: Fix boot failure due to double clock initialization 2013-12-13 21:48:25 -08:00
mach-s5p64x0
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mach-s5pc100
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mach-s5pv210 pwm: Changes for v3.13-rc1 2013-11-16 12:21:40 -08:00
mach-sa1100 ACPI and power management updates for 3.13-rc1 2013-11-14 13:41:48 +09:00
mach-shmobile ARM: shmobile: mackerel: Fix coherent DMA mask 2013-12-26 14:21:03 +09:00
mach-socfpga arm: socfpga: Enable ARM_TWD for socfpga 2013-12-03 14:19:48 -08:00
mach-spear
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mach-sti ARM: SoC fixes for 3.13 merge window 2013-11-16 12:45:55 -08:00
mach-sunxi ARM: sunxi: remove .init_time hooks 2013-10-28 10:19:45 -07:00
mach-tegra ARM: tegra: add missing break to fuse initialization code 2013-12-11 17:09:11 -08:00
mach-u300 DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
mach-ux500 Revert "ARM: ux500: Stop passing MMC's platform data for Device Tree boots" 2013-11-26 21:02:20 +01:00
mach-versatile
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mach-vexpress ARM: vexpress/TC2: Implement MCPM power_down_finish() 2013-11-25 14:12:14 -08:00
mach-virt
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mach-vt8500
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mach-w90x900
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mach-zynq ACPI and power management updates for 3.13-rc1 2013-11-14 13:41:48 +09:00
mm ARM: 7923/1: mm: fix dcache flush logic for compound high pages 2013-12-29 12:46:08 +00:00
net bpf: do not use reciprocal divide 2014-01-15 17:02:08 -08:00
nwfpe
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oprofile
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plat-iop
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plat-omap ARM: OMAP2+: Disable POSTED mode for errata i103 and i767 2013-11-26 15:03:36 -08:00
plat-orion
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plat-pxa
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plat-samsung pwm: Changes for v3.13-rc1 2013-11-16 12:21:40 -08:00
plat-versatile
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tools
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vfp ARM: 7873/1: vfp: clear vfp_current_hw_state for dying cpu 2013-10-30 22:10:10 +00:00
xen arm: xen: foreign mapping PTEs are special. 2013-12-11 17:06:05 +00:00
Kconfig Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm 2013-11-22 09:56:51 -08:00
Kconfig-nommu
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Kconfig.debug Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2013-11-14 08:51:29 +09:00
Makefile Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2013-11-14 08:51:29 +09:00