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Nicolas Pitre 7929eb9cf6 ARM: 5691/1: fix cache aliasing issues between kmap() and kmap_atomic() with highmem 
Let's suppose a highmem page is kmap'd with kmap().  A pkmap entry is
used, the page mapped to it, and the virtual cache is dirtied.  Then
kunmap() is used which does virtually nothing except for decrementing a
usage count.

Then, let's suppose the _same_ page gets mapped using kmap_atomic().
It is therefore mapped onto a fixmap entry instead, which has a
different virtual address unaware of the dirty cache data for that page
sitting in the pkmap mapping.

Fortunately it is easy to know if a pkmap mapping still exists for that
page and use it directly with kmap_atomic(), thanks to kmap_high_get().

And actual testing with a printk in the added code path shows that this
condition is actually met *extremely* frequently.  Seems that we've been
quite lucky that things have worked so well with highmem so far.

Cc: stable@kernel.org
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-09-04 19:20:07 +01:00
..
boot ARM: includecheck fix: misc.c 2009-07-25 17:07:00 +01:00
common ARM: 5639/1: arm: clkdev.c should include <linux/clk.h> 2009-08-05 22:06:58 +01:00
configs [ARM] Kirkwood: enable eSATA on QNAP TS-219P 2009-08-24 11:56:00 -04:00
include/asm ARM: Fix broken highmem support 2009-08-15 12:36:00 +01:00
kernel ARM: 5638/1: arch/arm/kernel/signal.c: use correct address space for CRUNCH 2009-08-05 22:06:58 +01:00
lib Merge branch 'copy_user' of git://git.marvell.com/orion into devel 2009-06-14 10:59:32 +01:00
mach-aaec2000
mach-at91 Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx 2009-07-30 16:46:31 -07:00
mach-clps711x
mach-davinci ARM: includecheck fix: board-sffsdr.c 2009-07-25 17:07:02 +01:00
mach-ebsa110
mach-ep93xx [ARM] 5611/1: ep93xx: update ts72xx nor flash support 2009-07-23 10:21:24 +01:00
mach-footbridge
mach-gemini
mach-h720x
mach-integrator
mach-iop13xx
mach-iop32x
mach-iop33x
mach-ixp4xx IXP4xx: Fix IO_SPACE_LIMIT for 2.6.31-rc core PCI changes 2009-08-11 19:22:20 +02:00
mach-ixp23xx
mach-ixp2000
mach-kirkwood [ARM] Kirkwood: enable eSATA on QNAP TS-219P 2009-08-24 11:56:00 -04:00
mach-ks8695 ARM: 5637/1: [KS8695] Don't reference CLOCK_TICK_RATE in drivers 2009-08-05 22:06:56 +01:00
mach-l7200
mach-lh7a40x
mach-loki
mach-mmp [ARM] pxa: add PWM devices support for pxa168/910 2009-06-05 10:32:06 +08:00
mach-msm
mach-mv78xx0 [ARM] orion: convert gpio to use gpiolib 2009-06-08 13:04:57 -04:00
mach-mx1
mach-mx2 Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2009-06-14 13:42:43 -07:00
mach-mx3 mx31moboard: invert sdhc ro signal sense 2009-08-14 12:33:23 +02:00
mach-netx
mach-ns9xxx
mach-omap1 ARM: includecheck fix: mach-omap1/mcbsp.c 2009-07-25 17:08:22 +01:00
mach-omap2 Merge branch 'pm-upstream/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-omap-pm 2009-08-10 15:50:27 +01:00
mach-orion5x [ARM] orion5x: register the crypto device on SOCs that support it 2009-06-15 00:37:08 -04:00
mach-pnx4008
mach-pxa Merge branch 'fix' of git://git.kernel.org/pub/scm/linux/kernel/git/ycmiao/pxa-linux-2.6 2009-07-30 10:46:12 +01:00
mach-realview ARM: Realview & Versatile: Fix i2c_board_info definitions 2009-07-18 17:08:59 +01:00
mach-rpc
mach-s3c24a0/include/mach
mach-s3c2400
mach-s3c2410 S3C24XX: GPIO: Fix pin range check in s3c_gpiolib_getchip 2009-07-29 23:47:14 +01:00
mach-s3c2412 Merge branch for-rmk-devel of git://aeryn.fluff.org.uk/bjdooks/linux into devel 2009-06-10 22:41:06 +01:00
mach-s3c2440 [ARM] MINI2440: Add missing flash_bbt flat to NAND 2009-06-23 18:23:27 +01:00
mach-s3c2442 [ARM] GTA02: build fixes (s3c2410_nand_set usage) 2009-06-24 00:10:46 +01:00
mach-s3c2443
mach-s3c6400 Merge branch for-rmk-devel of git://aeryn.fluff.org.uk/bjdooks/linux into devel 2009-06-10 22:41:06 +01:00
mach-s3c6410
mach-sa1100 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-06-14 13:46:25 -07:00
mach-shark
mach-stmp37xx [ARM] 5539/1: Freescale STMP: onboard devices declaration 2009-06-04 14:16:45 +01:00
mach-stmp378x [ARM] 5539/1: Freescale STMP: onboard devices declaration 2009-06-04 14:16:45 +01:00
mach-u300 ARM: 5673/1: U300 fix initsection compile warning 2009-08-15 15:36:52 +01:00
mach-versatile ARM: Realview & Versatile: Fix i2c_board_info definitions 2009-07-18 17:08:59 +01:00
mach-w90x900 [ARM] 5549/1: Add clock api for w90p910 platform. 2009-06-11 14:45:18 +01:00
mm ARM: 5691/1: fix cache aliasing issues between kmap() and kmap_atomic() with highmem 2009-09-04 19:20:07 +01:00
nwfpe
oprofile
plat-iop
plat-mxc pcm037: add MT9T031 camera support 2009-06-23 14:25:26 +02:00
plat-omap Merge branch 'pm-upstream/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-omap-pm 2009-08-10 15:50:27 +01:00
plat-orion [ARM] Kirkwood: __init requires linux/init.h 2009-08-24 11:55:59 -04:00
plat-pxa [ARM] pxa: use kzalloc() in pxa_init_gpio_chip() 2009-07-03 14:17:51 +08:00
plat-s3c [ARM] S3C: Fix S3C24XX build to not include s3c64xx IIS devices 2009-06-23 16:34:35 +01:00
plat-s3c24xx ARM: S3C24XX: Fix clkout mpx error 2009-08-14 00:45:49 +01:00
plat-s3c64xx Merge branch 's3c-fixes-rc4' of git://aeryn.fluff.org.uk/bjdooks/linux 2009-07-30 10:47:55 +01:00
plat-stmp3xxx ARM: includecheck fix: plat-stmp3xxx/pinmux.c 2009-07-25 17:08:24 +01:00
tools [ARM] Update mach-types 2009-06-20 22:28:41 +01:00
vfp
Kconfig [ARM] S3C64XX: Initial support for DVFS 2009-06-16 23:36:24 +01:00
Kconfig-nommu
Kconfig.debug [ARM] S3C: Remove unused CONFIG_DEBUG_S3C_PORT 2009-06-23 12:24:07 +01:00
Makefile Merge branch 'u300' into devel 2009-06-14 11:01:44 +01:00