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ARM: Avoid building unsafe kernels on OMAP2 and MX3 

OMAP2 (armv6) and MX3 turn off support for the V6K instructions, which
when they include support for SMP kernels means that the resulting
kernel is unsafe on SMP and can result in corrupted filesystems as we
end up using unsafe bitops.

Re-enable the use of V6K instructions on such kernels, and let such
kernels running on V6 CPUs eat undefined instruction faults which will
be much safer than filesystem corruption.  Next merge window we can fix
this properly (as it requires a much bigger set of changes.)

Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2011-02-09 16:33:46 +00:00
parent 100b33c8bd
commit 15490ef8ff
1 changed files with 2 additions and 2 deletions
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4
arch/arm/mm/Kconfig
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@ -405,7 +405,7 @@ config CPU_V6
config CPU_32v6K
bool "Support ARM V6K processor extensions" if !SMP
depends on CPU_V6 || CPU_V7
default y if SMP && !(ARCH_MX3 || ARCH_OMAP2)
default y if SMP
help
Say Y here if your ARMv6 processor supports the 'K' extension.
This enables the kernel to use some instructions not present
@ -416,7 +416,7 @@ config CPU_32v6K
# ARMv7
config CPU_V7
bool "Support ARM V7 processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB || MACH_REALVIEW_PBX
select CPU_32v6K if !ARCH_OMAP2
select CPU_32v6K
select CPU_32v7
select CPU_ABRT_EV7
select CPU_PABRT_V7