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6a4dae5e13
kernel_optimize_test/arch/arm
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Felipe Balbi 2 6a4dae5e13 ARM: 7565/1: sched: stop sched_clock() during suspend 
The scheduler imposes a requirement to sched_clock()
which is to stop the clock during suspend, if we don't
do that any RT thread will be rescheduled in the future
which might cause any sort of problems.

This became an issue on OMAP when we converted omap-i2c.c
to use threaded IRQs, it turned out that depending on how
much time we spent on suspend, the I2C IRQ thread would
end up being rescheduled so far in the future that I2C
transfers would timeout and, because omap_hsmmc depends
on an I2C-connected device to detect if an MMC card is
inserted in the slot, our rootfs would just vanish.

arch/arm/kernel/sched_clock.c already had an optional
implementation (sched_clock_needs_suspend()) which would
handle scheduler's requirement properly, what this patch
does is simply to make that implementation non-optional.

Note that this has the side-effect that printk timings
won't reflect the actual time spent on suspend so other
methods to measure that will have to be used.

This has been tested with beagleboard XM (OMAP3630) and
pandaboard rev A3 (OMAP4430). Suspend to RAM is now working
after this patch.

Thanks to Kevin Hilman for helping out with debugging.

Acked-by: Kevin Hilman <khilman@ti.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2012-10-29 10:02:49 +00:00
..
boot Merge tag 'fixes-for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc into fixes 2012-10-22 22:56:09 +01:00
common ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
configs UAPI Disintegration 2012-10-09 2012-10-09 15:04:25 +01:00
crypto
include ARM: 7565/1: sched: stop sched_clock() during suspend 2012-10-29 10:02:49 +00:00
kernel ARM: 7565/1: sched: stop sched_clock() during suspend 2012-10-29 10:02:49 +00:00
lib ARM: export default read_current_timer 2012-10-09 20:24:36 +02:00
mach-at91 ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-bcm2835
mach-clps711x ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-cns3xxx
mach-davinci ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-dove Merge branch 'samsung_platform_data' into staging/for_v3.7 2012-10-05 22:32:05 -03:00
mach-ebsa110 ARM: soc: driver specific changes 2012-10-01 18:46:13 -07:00
mach-ep93xx ARM: soc: multiplatform enablement 2012-10-01 19:11:38 -07:00
mach-exynos ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-footbridge ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-gemini
mach-h720x ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-highbank Merge branch 'for-v3.7' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping 2012-10-02 19:13:12 -07:00
mach-imx ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-integrator ARM: integrator: use __iomem pointers for MMIO, part 2 2012-10-09 17:27:33 +02:00
mach-iop13xx Merge branch 'late/fixes' into fixes 2012-10-07 07:22:32 -07:00
mach-iop32x Merge branch 'cleanup/__iomem' into next/cleanup 2012-09-22 10:24:29 -07:00
mach-iop33x
mach-ixp4xx ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-kirkwood Merge branch 'samsung_platform_data' into staging/for_v3.7 2012-10-05 22:32:05 -03:00
mach-ks8695 Merge branch 'late/fixes' into fixes 2012-10-07 07:22:32 -07:00
mach-l7200/include/mach
mach-lpc32xx ARM: soc: multiplatform enablement 2012-10-01 19:11:38 -07:00
mach-mmp ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-msm ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-mv78xx0 Merge branch 'late/fixes' into fixes 2012-10-07 07:22:32 -07:00
mach-mvebu ARM: mvebu: fix build breaks from multi-platform conversion 2012-09-28 22:27:07 +02:00
mach-mxs ARM: soc: multiplatform enablement 2012-10-01 19:11:38 -07:00
mach-netx
mach-nomadik ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-omap1 ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-omap2 ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-orion5x ARM: soc: late platform updates 2012-10-07 20:55:16 +09:00
mach-picoxcell
mach-prima2 ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-pxa ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-realview ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-rpc ARM: rpc: check device_register return code in ecard_probe 2012-10-07 10:33:09 +02:00
mach-s3c24xx ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-s3c64xx ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-s3c2410
mach-s3c2412 ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-s3c2440 ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-s5p64x0 ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-s5pc100 ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-s5pv210 ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-sa1100 ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-shark Merge branch 'late/fixes' into fixes 2012-10-07 07:22:32 -07:00
mach-shmobile ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-socfpga
mach-spear3xx
mach-spear6xx
mach-spear13xx Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2012-10-10 11:10:41 +09:00
mach-tegra ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-u300 ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-ux500 ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-versatile ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
mach-vexpress Features: 2012-10-07 07:13:01 +09:00
mach-vt8500 arm: vt8500: Fix build warning in uncompress.h 2012-10-07 14:50:06 -07:00
mach-w90x900
mach-zynq
mm Merge tag 'fixes-for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc into fixes 2012-10-22 22:56:09 +01:00
net
nwfpe
oprofile
plat-iop
plat-mxc ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
plat-nomadik ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
plat-omap ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
plat-orion Merge branch 'samsung_platform_data' into staging/for_v3.7 2012-10-05 22:32:05 -03:00
plat-pxa
plat-s3c24xx ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
plat-samsung ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
plat-spear ARM: config: sort select statements alphanumerically 2012-10-13 17:11:28 +01:00
plat-versatile Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2012-10-07 21:20:57 +09:00
tools ARM: be really quiet when building with 'make -s' 2012-10-09 20:29:05 +02:00
vfp
xen
Kconfig Merge tag 'fixes-for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc into fixes 2012-10-22 22:56:09 +01:00
Kconfig-nommu
Kconfig.debug ARM: soc: multiplatform enablement 2012-10-01 19:11:38 -07:00
Makefile ARM: pass -marm to gcc by default for both C and assembler 2012-10-09 20:29:05 +02:00