From: will.deacon@arm•com (Will Deacon)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 6/6] arm64: Remove the CONFIG_ARM64_HW_AFDBM option
Date: Thu, 17 Aug 2017 14:31:54 +0100 [thread overview]
Message-ID: <20170817133154.GB29194@arm.com> (raw)
In-Reply-To: <20170725135308.18173-7-catalin.marinas@arm.com>
On Tue, Jul 25, 2017 at 02:53:08PM +0100, Catalin Marinas wrote:
> Since the pte handling for hardware AF/DBM works even when the hardware
> feature is not present, make the implementation permanent and remove the
> Kconfig option.
>
> Cc: Will Deacon <will.deacon@arm•com>
> Cc: Marc Zyngier <marc.zyngier@arm•com>
> Cc: Christoffer Dall <christoffer.dall@linaro•org>
> Signed-off-by: Catalin Marinas <catalin.marinas@arm•com>
> ---
> arch/arm64/Kconfig | 17 -----------------
> arch/arm64/include/asm/pgtable.h | 9 +--------
> arch/arm64/kvm/hyp/s2-setup.c | 2 +-
> arch/arm64/mm/fault.c | 2 --
> arch/arm64/mm/proc.S | 3 +--
> 5 files changed, 3 insertions(+), 30 deletions(-)
Largely in favour of this, but I'd prefer to keep the option so that
we can build kernels where the enabling:
> diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
> index 877d42fb0df6..ba82f8bf3cf1 100644
> --- a/arch/arm64/mm/proc.S
> +++ b/arch/arm64/mm/proc.S
> @@ -234,7 +234,7 @@ ENTRY(__cpu_setup)
> */
> mrs x9, ID_AA64MMFR0_EL1
> bfi x10, x9, #32, #3
> -#ifdef CONFIG_ARM64_HW_AFDBM
> +
> /*
> * Hardware update of the Access and Dirty bits.
> */
> @@ -246,7 +246,6 @@ ENTRY(__cpu_setup)
> orr x10, x10, #TCR_HD // hardware Dirty flag update
> 1: orr x10, x10, #TCR_HA // hardware Access flag update
> 2:
> -#endif /* CONFIG_ARM64_HW_AFDBM */
> msr tcr_el1, x10
> ret // return to head.S
> ENDPROC(__cpu_setup)
is still configurable. That might help for debugging suspected races in
this area.
Will
next prev parent reply other threads:[~2017-08-17 13:31 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-25 13:53 [PATCH 0/6] Rework the pte handling for hardware AF/DBM Catalin Marinas
2017-07-25 13:53 ` [PATCH 1/6] arm64: Fix potential race with hardware DBM in ptep_set_access_flags() Catalin Marinas
2017-08-01 17:03 ` Will Deacon
2017-08-02 9:01 ` Catalin Marinas
2017-07-25 13:53 ` [PATCH 2/6] arm64: Convert pte handling from inline asm to using (cmp)xchg Catalin Marinas
2017-08-17 12:59 ` Will Deacon
2017-08-18 16:15 ` Catalin Marinas
2017-07-25 13:53 ` [PATCH 3/6] kvm: arm64: Convert kvm_set_s2pte_readonly() from inline asm to cmpxchg() Catalin Marinas
2017-08-01 11:16 ` Christoffer Dall
2017-08-02 9:15 ` Catalin Marinas
2017-08-02 12:48 ` Christoffer Dall
2017-07-25 13:53 ` [PATCH 4/6] arm64: Move PTE_RDONLY bit handling out of set_pte_at() Catalin Marinas
2017-08-17 13:27 ` Will Deacon
2017-08-18 15:59 ` Catalin Marinas
2017-07-25 13:53 ` [PATCH 5/6] arm64: Ignore hardware dirty bit updates in ptep_set_wrprotect() Catalin Marinas
2017-08-17 13:37 ` Will Deacon
2017-08-18 15:58 ` Catalin Marinas
2017-07-25 13:53 ` [PATCH 6/6] arm64: Remove the CONFIG_ARM64_HW_AFDBM option Catalin Marinas
2017-08-17 13:31 ` Will Deacon [this message]
2017-08-18 15:54 ` Catalin Marinas
2017-08-16 17:16 ` [PATCH 0/6] Rework the pte handling for hardware AF/DBM Catalin Marinas
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