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ARM: 7291/1: cache: assume 64-byte L1 cachelines for ARMv7 CPUs 

To ensure correct alignment of cacheline-aligned data, the maximum
cacheline size needs to be known at compile time.

Since Cortex-A8 and Cortex-A15 have 64-byte cachelines (and it is likely
that there will be future ARMv7 implementations with the same line size)
then it makes sense to assume that CPU_V7 implies a 64-byte L1 cacheline
size. For CPUs with smaller caches, this will result in some harmless
padding but will help with single zImage work and avoid hitting subtle
bugs with misaligned data structures.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon 2012-01-20 12:01:10 +01:00 committed by Russell King
parent 972da06470
commit a092f2b153
4 changed files with 1 additions and 6 deletions
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2
arch/arm/Kconfig
View File

@ -825,7 +825,6 @@ config ARCH_S5PC100
select HAVE_CLK
select CLKDEV_LOOKUP
select CPU_V7
select ARM_L1_CACHE_SHIFT_6
select ARCH_USES_GETTIMEOFFSET
select HAVE_S3C2410_I2C if I2C
select HAVE_S3C_RTC if RTC_CLASS
@ -842,7 +841,6 @@ config ARCH_S5PV210
select HAVE_CLK
select CLKDEV_LOOKUP
select CLKSRC_MMIO
select ARM_L1_CACHE_SHIFT_6
select ARCH_HAS_CPUFREQ
select GENERIC_CLOCKEVENTS
select HAVE_SCHED_CLOCK

3
arch/arm/mach-mx5/Kconfig
View File

@ -15,7 +15,6 @@ config ARCH_MX53
config SOC_IMX50
bool
select CPU_V7
select ARM_L1_CACHE_SHIFT_6
select MXC_TZIC
select ARCH_MXC_IOMUX_V3
select ARCH_MXC_AUDMUX_V2
@ -25,7 +24,6 @@ config SOC_IMX50
config SOC_IMX51
bool
select CPU_V7
select ARM_L1_CACHE_SHIFT_6
select MXC_TZIC
select ARCH_MXC_IOMUX_V3
select ARCH_MXC_AUDMUX_V2
@ -35,7 +33,6 @@ config SOC_IMX51
config SOC_IMX53
bool
select CPU_V7
select ARM_L1_CACHE_SHIFT_6
select MXC_TZIC
select ARCH_MXC_IOMUX_V3
select ARCH_MX53

1
arch/arm/mach-omap2/Kconfig
View File

@ -33,7 +33,6 @@ config ARCH_OMAP3
default y
select CPU_V7
select USB_ARCH_HAS_EHCI
select ARM_L1_CACHE_SHIFT_6 if !ARCH_OMAP4
select ARCH_HAS_OPP
select PM_OPP if PM
select ARM_CPU_SUSPEND if PM

1
arch/arm/mm/Kconfig
View File

@ -882,6 +882,7 @@ config CACHE_XSC3L2
config ARM_L1_CACHE_SHIFT_6
bool
default y if CPU_V7
help
Setting ARM L1 cache line size to 64 Bytes.