From: Mike Rapoport <rppt@kernel.org>
To: Vineet Gupta <vgupta@kernel.org>
Cc: linux-snps-arc@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Anshuman Khandual <anshuman.khandual@arm.com>
Subject: Re: [PATCH 11/18] ARC: mm: move MMU specific bits out of entry code
Date: Wed, 11 Aug 2021 15:15:17 +0300 [thread overview]
Message-ID: <YRO/VSMNi00X37xQ@kernel.org> (raw)
In-Reply-To: <20210811004258.138075-12-vgupta@kernel.org>
I believe a few words here would be useful even for the future version of
yourself ;-)
On Tue, Aug 10, 2021 at 05:42:51PM -0700, Vineet Gupta wrote:
> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
> ---
> arch/arc/kernel/entry.S | 6 ------
> arch/arc/mm/tlb.c | 3 +++
> 2 files changed, 3 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S
> index 2cb8dfe866b6..684efd094520 100644
> --- a/arch/arc/kernel/entry.S
> +++ b/arch/arc/kernel/entry.S
> @@ -101,12 +101,6 @@ ENTRY(EV_MachineCheck)
> lr r0, [efa]
> mov r1, sp
>
> - ; hardware auto-disables MMU, re-enable it to allow kernel vaddr
> - ; access for say stack unwinding of modules for crash dumps
> - lr r3, [ARC_REG_PID]
> - or r3, r3, MMU_ENABLE
> - sr r3, [ARC_REG_PID]
> -
> lsr r3, r2, 8
> bmsk r3, r3, 7
> brne r3, ECR_C_MCHK_DUP_TLB, 1f
> diff --git a/arch/arc/mm/tlb.c b/arch/arc/mm/tlb.c
> index b68d5798327b..34f16e0b41e6 100644
> --- a/arch/arc/mm/tlb.c
> +++ b/arch/arc/mm/tlb.c
> @@ -813,5 +813,8 @@ void do_tlb_overlap_fault(unsigned long cause, unsigned long address,
> }
> }
>
> + /* Re-enable MMU as hardware may have auto-disabled it upon exception */
> + write_aux_reg(ARC_REG_PID, read_aux_reg(ARC_REG_PID) | MMU_ENABLE);
> +
> local_irq_restore(flags);
> }
> --
> 2.25.1
>
--
Sincerely yours,
Mike.
next prev parent reply other threads:[~2021-08-11 12:16 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-11 0:42 [PATCH 00/18] ARC mm updates to support 3 or 4 levels of paging Vineet Gupta
2021-08-11 0:42 ` [PATCH 01/18] ARC: mm: simplify mmu scratch register assingment to mmu needs Vineet Gupta
2021-08-11 0:42 ` [PATCH 02/18] ARC: mm: remove tlb paranoid code Vineet Gupta
2021-08-11 0:42 ` [PATCH 03/18] ARC: mm: move mmu/cache externs out to setup.h Vineet Gupta
2021-08-11 5:10 ` Mike Rapoport
2021-08-11 18:46 ` Vineet Gupta
2021-08-11 0:42 ` [PATCH 04/18] ARC: mm: remove pgd_offset_fast Vineet Gupta
2021-08-11 5:12 ` Mike Rapoport
2021-08-11 18:54 ` Vineet Gupta
2021-08-11 0:42 ` [PATCH 05/18] ARC: mm: Fixes to allow STRICT_MM_TYPECHECKS Vineet Gupta
2021-08-11 0:42 ` [PATCH 06/18] ARC: mm: Enable STRICT_MM_TYPECHECKS Vineet Gupta
2021-08-11 12:04 ` Mike Rapoport
2021-08-11 19:01 ` Vineet Gupta
2021-08-11 0:42 ` [PATCH 07/18] ARC: ioremap: use more commonly used PAGE_KERNEL based uncached flag Vineet Gupta
2021-08-11 5:18 ` Mike Rapoport
2021-08-11 18:58 ` Vineet Gupta
2021-08-11 0:42 ` [PATCH 08/18] ARC: mm: pmd_populate* to use the canonical set_pmd (and drop pmd_set) Vineet Gupta
2021-08-11 0:42 ` [PATCH 09/18] ARC: mm: non-functional code cleanup ahead of 3 levels Vineet Gupta
2021-08-11 12:31 ` Mike Rapoport
2021-08-12 1:37 ` Vineet Gupta
2021-08-12 6:18 ` Mike Rapoport
2021-08-12 18:58 ` Vineet Gupta
2021-08-11 0:42 ` [PATCH 10/18] ARC: mm: move MMU specific bits out of ASID allocator Vineet Gupta
2021-08-11 0:42 ` [PATCH 11/18] ARC: mm: move MMU specific bits out of entry code Vineet Gupta
2021-08-11 12:15 ` Mike Rapoport [this message]
2021-08-11 19:30 ` Vineet Gupta
2021-08-11 0:42 ` [PATCH 12/18] ARC: mm: disintegrate mmu.h (arcv2 bits out) Vineet Gupta
2021-08-11 0:42 ` [PATCH 13/18] ARC: mm: disintegrate pgtable.h into levels and flags Vineet Gupta
2021-08-11 0:42 ` [PATCH 14/18] ARC: mm: hack to allow 2 level build with 4 level code Vineet Gupta
2021-08-11 0:42 ` [PATCH 15/18] ARC: mm: support 3 levels of page tables Vineet Gupta
2021-08-11 12:24 ` Mike Rapoport
2021-08-11 22:15 ` Vineet Gupta
2021-08-11 0:42 ` [PATCH 16/18] ARC: mm: support 4 " Vineet Gupta
2021-08-11 12:28 ` Mike Rapoport
2021-08-11 22:17 ` Vineet Gupta
2021-08-11 0:42 ` [PATCH 17/18] ARC: mm: vmalloc sync from kernel to user table to update PMD Vineet Gupta
2021-08-11 0:42 ` [PATCH 18/18] ARC: mm: introduce _PAGE_TABLE to explicitly link pgd,pud,pmd entries Vineet Gupta
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