[PATCH v14 2/8] arm64: Handle MTE tags zeroing in __alloc_zeroed_user_highpage()
Catalin Marinas
catalin.marinas at arm.com
Mon Jun 7 10:07:14 PDT 2021
On Mon, Jun 07, 2021 at 12:08:10PM +0100, Steven Price wrote:
> From: Catalin Marinas <catalin.marinas at arm.com>
>
> Currently, on an anonymous page fault, the kernel allocates a zeroed
> page and maps it in user space. If the mapping is tagged (PROT_MTE),
> set_pte_at() additionally clears the tags under a spinlock to avoid a
> race on the page->flags. In order to optimise the lock, clear the page
> tags on allocation in __alloc_zeroed_user_highpage() if the vma flags
> have VM_MTE set.
>
> Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>
> Signed-off-by: Steven Price <steven.price at arm.com>
I think you can drop this patch now that Peter's series has been queued
via the arm64 tree:
https://lore.kernel.org/r/20210602235230.3928842-4-pcc@google.com
--
Catalin
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