From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.deacon@arm.com (Will Deacon) Date: Wed, 22 Aug 2012 15:39:46 +0100 Subject: [PATCH 2/4] ARM: allow PID_IN_CONTEXTIDR only for ARMv7 In-Reply-To: <1345645780-2749-3-git-send-email-arnd@arndb.de> References: <1345645780-2749-1-git-send-email-arnd@arndb.de> <1345645780-2749-3-git-send-email-arnd@arndb.de> Message-ID: <20120822143946.GM9093@mudshark.cambridge.arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 > Cc: Will Deacon > Cc: Russell King > --- > 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