linux-kernel - Re: [PATCH 16/22] arm64/debug: Make use of the system wide safe value

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Date:	Tue, 29 Sep 2015 13:17:29 +0100
From:	Vladimir Murzin <vladimir.murzin@....com>
To:	"Suzuki K. Poulose" <suzuki.poulose@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
CC:	Mark Rutland <Mark.Rutland@....com>,
	"ard.biesheuvel@...aro.org" <ard.biesheuvel@...aro.org>,
	"aph@...hat.com" <aph@...hat.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"edward.nevill@...aro.org" <edward.nevill@...aro.org>,
	Andre Przywara <Andre.Przywara@....com>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Dave P Martin <Dave.Martin@....com>
Subject: Re: [PATCH 16/22] arm64/debug: Make use of the system wide safe value

On 16/09/15 15:21, Suzuki K. Poulose wrote:
> From: "Suzuki K. Poulose" <suzuki.poulose@....com>
> 
> Use the system wide value of ID_AA64DFR0 to make safer decisions
> 
> Signed-off-by: Suzuki K. Poulose <suzuki.poulose@....com>
> ---
>  arch/arm64/include/asm/hw_breakpoint.h |   14 ++------------
>  arch/arm64/kernel/debug-monitors.c     |    6 ++++--
>  arch/arm64/kernel/hw_breakpoint.c      |   19 ++++++++++++++++++-
>  3 files changed, 24 insertions(+), 15 deletions(-)
> 

Looks like this patch introduces build-time regression if
CONFIG_PERF_EVENTS is not set:

> arch/arm64/kvm/built-in.o: In function `kvm_arm_setup_debug':
> /work/tools/linux/arch/arm64/kvm/debug.c:173: undefined reference to `get_num_brps'
> /work/tools/linux/arch/arm64/kvm/debug.c:177: undefined reference to `get_num_wrps'
> arch/arm64/kvm/built-in.o: In function `kvm_arm_clear_debug':
> /work/tools/linux/arch/arm64/kvm/debug.c:208: undefined reference to `get_num_brps'
> /work/tools/linux/arch/arm64/kvm/debug.c:212: undefined reference to `get_num_wrps'
> arch/arm64/kvm/built-in.o: In function `kvm_arch_dev_ioctl_check_extension':
> /work/tools/linux/arch/arm64/kvm/reset.c:78: undefined reference to `get_num_wrps'
> /work/tools/linux/arch/arm64/kvm/reset.c:75: undefined reference to `get_num_brps'
> make: *** [vmlinux] Error 1

Vladimir

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