Messages in this thread | | | Date | Wed, 22 Aug 2012 15:39:46 +0100 | From | Will Deacon <> | Subject | Re: [PATCH 2/4] ARM: allow PID_IN_CONTEXTIDR only for ARMv7 |
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Hi Arnd,
On Wed, Aug 22, 2012 at 03:29:38PM +0100, Arnd Bergmann wrote: > When ARMv6 is enabled, we build the kernel with -march=armv6 or > -march=armv6k, which means the bfi instruction is not available. > Instead, it only works with -march=armv6t2 or -march=armv7-a. > > Without this patch, building rand-enIHAOL results in: > > /tmp/ccwCsCXC.s: Assembler messages: > /tmp/ccwCsCXC.s:49: Error: selected processor does not support ARM mode `bfi r3,r2,#0,#8' > > Signed-off-by: Arnd Bergmann <arnd@arndb.de> > Cc: Will Deacon <will.deacon@arm.com> > Cc: Russell King <rmk+kernel@arm.linux.org.uk> > --- > arch/arm/Kconfig.debug | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug > index f15f82b..11b9ff4 100644 > --- a/arch/arm/Kconfig.debug > +++ b/arch/arm/Kconfig.debug > @@ -398,6 +398,7 @@ config ARM_KPROBES_TEST > config PID_IN_CONTEXTIDR > bool "Write the current PID to the CONTEXTIDR register" > depends on CPU_COPY_V6 > + depends on CPU_V7 && !CPU_V6 > help > Enabling this option causes the kernel to write the current PID to > the PROCID field of the CONTEXTIDR register, at the expense of some
Nah, I'll fix the contextidr_notifier instead. I forgot that this stuff gets used on non-SMP v6 platforms.
Cheers,
Will
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