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067e710b9a
linux/arch/arm
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Paul Walmsley 067e710b9a ARM: 7801/1: v6: prevent gcc 4.5 from reordering extended CP15 reads above is_smp() test 
Commit 621a0147d5 ("ARM: 7757/1: mm:
don't flush icache in switch_mm with hardware broadcasting") breaks
the boot on OMAP2430SDP with omap2plus_defconfig.  Tracked to an
undefined instruction abort from the CP15 read in
cache_ops_need_broadcast().  It turns out that gcc 4.5 reorders the
extended CP15 read above the is_smp() test.  This breaks ARM1136 r0
cores, since they don't support several CP15 registers that later ARM
cores do.  ARM1136JF-S TRM section 3.2.1 "Register allocation" has the
details.

So mark the extended CP15 read as clobbering memory, which prevents
the compiler from reordering it before the is_smp() test.  Russell
states that the code generated from this approach is preferable to
marking the inline asm as volatile.  Remove the existing condition
code clobber as it's obsolete, per Nico's post:

    http://www.spinics.net/lists/arm-kernel/msg261208.html

This patch is a collaboration with Will Deacon and Russell King.

Comments from Paul Walmsley:

 Russell, if you accept this one, might you also add Will's ack from the lists:

Comments from Paul Walmsley:

 I'd also be obliged if you could add a Cc: line for Jonathan Austin, since he helped test:

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Tony Lindgren <tony@atomide.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Jonathan Austin <jonathan.austin@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-07-31 11:12:59 +01:00
..
boot ARM: SoC fixes for 3.11-rc 2013-07-13 15:00:26 -07:00
common arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
configs ARM: SoC fixes for 3.11-rc 2013-07-13 15:00:26 -07:00
crypto ARM: 7723/1: crypto: sha1-armv4-large.S: fix SP handling 2013-05-22 22:01:35 +01:00
include ARM: 7801/1: v6: prevent gcc 4.5 from reordering extended CP15 reads above is_smp() test 2013-07-31 11:12:59 +01:00
kernel ARM: 7800/1: ARMv7-M: Fix name of NVIC handler function 2013-07-31 11:12:58 +01:00
kvm KVM fixes for 3.11 2013-07-03 13:21:40 -07:00
lib arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-at91 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-bcm ARM: bcm281xx: Remove init_irq declaration in machine description 2013-05-14 09:48:40 -07:00
mach-bcm2835 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-clps711x reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-cns3xxx reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-davinci Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2013-07-13 12:09:57 -07:00
mach-dove Watchdog: allow orion_wdt to be built for Dove 2013-07-11 22:17:56 +02:00
mach-ebsa110 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-ep93xx reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-exynos arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-footbridge reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-gemini ARM: arm-soc cleanup for 3.10 2013-05-02 09:03:55 -07:00
mach-highbank arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-imx arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-integrator reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-iop13xx reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-iop32x reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-iop33x
mach-ixp4xx ARM: SoC fixes for 3.11-rc 2013-07-13 15:00:26 -07:00
mach-keystone arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-kirkwood Watchdog: allow orion_wdt to be built for Dove 2013-07-11 22:17:56 +02:00
mach-ks8695 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-lpc32xx reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-mmp reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-msm arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-mv78xx0 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-mvebu arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-mxs Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2013-07-09 18:24:39 -07:00
mach-netx reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-nomadik reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-nspire arm: Add Initial TI-Nspire support 2013-06-21 20:06:30 +02:00
mach-omap1 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-omap2 arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-orion5x Watchdog: allow orion_wdt to be built for Dove 2013-07-11 22:17:56 +02:00
mach-picoxcell reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-prima2 arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-pxa reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-realview reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-rockchip arm: add basic support for Rockchip RK3066a boards 2013-06-21 09:21:02 +02:00
mach-rpc reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-s3c24xx cpufreq: s3c24xx: fix "depends on ARM_S3C24XX" in Kconfig 2013-07-16 21:52:22 +02:00
mach-s3c64xx reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-s5p64x0 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-s5pc100 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-s5pv210 For the 3.11 merge we only have one new MFD driver for the Kontron PLD. 2013-07-10 11:10:27 -07:00
mach-sa1100 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-shark reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-shmobile arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-socfpga arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-spear arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-sti arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-sunxi reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-tegra arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-u300 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-ux500 arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-versatile reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-vexpress ARM SoC specific changes 2013-07-02 13:43:38 -07:00
mach-virt Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2013-07-03 09:46:29 -07:00
mach-vt8500 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-w90x900 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-zynq arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mm ARM: 7789/1: Do not run dummy_flush_tlb_a15_erratum() on non-Cortex-A15 2013-07-26 12:02:09 +01:00
net arm: bpf_jit: can call module_free() from any context 2013-05-20 14:03:50 -07:00
nwfpe
oprofile
plat-iop reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
plat-omap Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-07-06 14:09:38 -07:00
plat-orion Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-07-06 14:09:38 -07:00
plat-pxa
plat-samsung Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-07-06 14:09:38 -07:00
plat-versatile arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
tools
vfp ARM: 7729/1: vfp: ensure VFP_arch is non-zero when VFP is not supported 2013-05-22 22:01:37 +01:00
xen xen/arm and xen/arm64: implement HYPERVISOR_tmem_op 2013-07-04 11:41:12 +00:00
Kconfig ARM: 7791/1: a.out: remove partial a.out support 2013-07-26 12:02:10 +01:00
Kconfig-nommu ARM: mpu: Ensure that MPU depends on CPU_V7 2013-06-17 15:13:18 +01:00
Kconfig.debug ARM: document DEBUG_UNCOMPRESS Kconfig option 2013-07-22 12:03:50 +01:00
Makefile ARM: Fix sorting of machine- initializers 2013-07-27 00:45:45 +01:00