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Nitin Gupta 787b2faadc ARM: force dcache flush if dcache_dirty bit set ... On ARM, update_mmu_cache() does dcache flush for a page only if it has a kernel mapping (page_mapping(page) != NULL). The correct behavior would be to force the flush based on dcache_dirty bit only. One of the cases where present logic would be a problem is when a RAM based block device[1] is used as a swap disk. In this case, we would have in-memory data corruption as shown in steps below: do_swap_page() { - Allocate a new page (if not already in swap cache) - Issue read from swap disk - Block driver issues flush_dcache_page() - flush_dcache_page() simply sets PG_dcache_dirty bit and does not actually issue a flush since this page has no user space mapping yet. - Now, if swap disk is almost full, this newly read page is removed from swap cache and corrsponding swap slot is freed. - Map this page anonymously in user space. - update_mmu_cache() - Since this page does not have kernel mapping (its not in page/swap cache and is mapped anonymously), it does not issue dcache flush even if dcache_dirty bit is set by flush_dcache_page() above. <user now gets stale data since dcache was never flushed> } Same problem exists on mips too. [1] example: - brd (RAM based block device) - ramzswap (RAM based compressed swap device) Signed-off-by: Nitin Gupta <ngupta@vflare.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>		16 years ago
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boot	kbuild: use INSTALLKERNEL to select customized installkernel script	16 years ago
common	ARM: 5735/1: sa1111: CodingStyle cleanups	16 years ago
configs	Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/xscaleiop	16 years ago
include/asm	ARM: boolean bit testing	16 years ago
kernel	Merge branch 'fix' of git://git.kernel.org/pub/scm/linux/kernel/git/ycmiao/pxa-linux-2.6	16 years ago
lib	Merge branch 'for-rmk' of git://linux-arm.org/linux-2.6	16 years ago
mach-aaec2000	[ARM] pass reboot command line to arch_reset()	16 years ago
mach-at91	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6	16 years ago
mach-bcmring	ARM: 5748/1: bcmring: fix build warning messages	16 years ago
mach-clps711x	[ARM] pass reboot command line to arch_reset()	16 years ago
mach-davinci	ARM: includecheck fix: mach-davinci, board-dm365-evm.c	16 years ago
mach-ebsa110	[ARM] pass reboot command line to arch_reset()	16 years ago
mach-ep93xx	ARM: 5756/1: ep93xx: introduce clk parent	16 years ago
mach-footbridge	[ARM] pass reboot command line to arch_reset()	16 years ago
mach-gemini	Gemini: Fix SRAM/ROM location after memory swap	16 years ago
mach-h720x	…
mach-integrator	headers: remove sched.h from interrupt.h	16 years ago
mach-iop13xx	Merge branch 'iop-raid6' into async-tx-next	16 years ago
mach-iop32x	iop3xx: ATU and PCI memory configuration corrected	16 years ago
mach-iop33x	…
mach-ixp4xx	ixp4xx: arch_idle() documentation fixup	16 years ago
mach-ixp23xx	[ARM] pass reboot command line to arch_reset()	16 years ago
mach-ixp2000	…
mach-kirkwood	Merge branch 'master' into devel	16 years ago
mach-ks8695	ARM: 5637/1: [KS8695] Don't reference CLOCK_TICK_RATE in drivers	16 years ago
mach-l7200	[ARM] mach-l7200: fix spelling of SYS_CLOCK_OFF	16 years ago
mach-lh7a40x	[ARM] pass reboot command line to arch_reset()	16 years ago
mach-loki	[ARM] add coherent DMA mask for mv643xx_eth	16 years ago
mach-mmp	[ARM] pxa: add PWM devices support for pxa168/910	16 years ago
mach-msm	clocksource: pass clocksource to read() callback	16 years ago
mach-mv78xx0	[ARM] orion: convert gpio to use gpiolib	16 years ago
mach-mx1	ARM: mxc: Fix i2c_board_info definitions	16 years ago
mach-mx2	mx21ads: Fix framebuffer platform data	16 years ago
mach-mx3	Merge branch 'master' into devel	16 years ago
mach-mx25	Freescale i.MX25 PDK (3ds) board support	16 years ago
mach-mxc91231	…
mach-netx	netx: Use get_irqnr_preamble to initialize base register	16 years ago
mach-nomadik	mtd: OneNand support for Nomadik 8815 SoC (on NHK8815 board)	16 years ago
mach-ns9xxx	const: constify remaining file_operations	16 years ago
mach-omap1	omap: Fix wrong jtag_id for 850	16 years ago
mach-omap2	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	16 years ago
mach-orion5x	[ARM] orion5x: Add LaCie NAS 2Big Network support	16 years ago
mach-pnx4008	[ARM] pass reboot command line to arch_reset()	16 years ago
mach-pxa	[ARM] pxa: workaround errata #37 by not using half turbo switching	16 years ago
mach-realview	ARM: 5720/1: Move MMCI header to amba include dir	16 years ago
mach-rpc	[ARM] pass reboot command line to arch_reset()	16 years ago
mach-s3c24a0/include/mach	ARM: S3C: move s3c_device_nand from plat-s3c24xx to plat-s3c	16 years ago
mach-s3c2400	…
mach-s3c2410	ARM: S3C: Add missing selection of S3C_DEV_NAND in machine Kconfigs.	16 years ago
mach-s3c2412	ARM: S3C: Add missing selection of S3C_DEV_NAND in machine Kconfigs.	16 years ago
mach-s3c2440	ARM: S3C: Add missing selection of S3C_DEV_NAND in machine Kconfigs.	16 years ago
mach-s3c2442	…
mach-s3c2443	…
mach-s3c6400	ARM: S3C: Add missing selection of S3C_DEV_NAND in machine Kconfigs.	16 years ago
mach-s3c6410	ARM: S3C: Add missing selection of S3C_DEV_NAND in machine Kconfigs.	16 years ago
mach-s5pc100	ARM: S5PC100: Board and configuration file	16 years ago
mach-sa1100	ARM: 5752/1: SA1100: fix building of h3100	16 years ago
mach-shark	…
mach-stmp37xx	[ARM] 5539/1: Freescale STMP: onboard devices declaration	16 years ago
mach-stmp378x	[ARM] 5539/1: Freescale STMP: onboard devices declaration	16 years ago
mach-u300	ARM: 5731/2: Fix U300 generic GPIO, remove ifdefs from MMCI v3	16 years ago
mach-versatile	ARM: 5720/1: Move MMCI header to amba include dir	16 years ago
mach-w90x900	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	16 years ago
mm	ARM: force dcache flush if dcache_dirty bit set	16 years ago
nwfpe	[ARM] nwfpe: fix 'floatx80_is_nan' sparse warning	16 years ago
oprofile	RealView: Move the IRQ_* definitions out of the board-*.h files	16 years ago
plat-iop	Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/xscaleiop	16 years ago
plat-mxc	spi: add SPI driver for most known i.MX SoCs	16 years ago
plat-omap	Merge branch 'pm-fixes-32' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-omap-pm into omap-fixes-for-linus	16 years ago
plat-orion	…
plat-pxa	…
plat-s3c	ARM: s3c: fix check of index into s3c_gpios[]	16 years ago
plat-s3c24xx	headers: remove sched.h from interrupt.h	16 years ago
plat-s3c64xx	Merge branch 'next-s3c-fixes' of git://aeryn.fluff.org.uk/bjdooks/linux	16 years ago
plat-s5pc1xx	ARM: S5PC100: Kconfigs and Makefiles	16 years ago
plat-stmp3xxx	ARM: STMP3xxx: deallocation with negative index of descriptors[]	16 years ago
tools	[ARM] Update mach-types	16 years ago
vfp	Thumb-2: Implement the unified VFP support	16 years ago
Kconfig	ARM: 5580/2: ARM TCM (Tightly-Coupled Memory) support v3	16 years ago
Kconfig-nommu	…
Kconfig.debug	Thumb-2: Add Thumb-2 support to the build files	16 years ago
Makefile	Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-next	16 years ago