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SubjectRe: [PATCHv16 05/17] mm: Introduce untagged_addr_remote()
Date
On Sun, 2023-03-12 at 14:26 +0300, Kirill A. Shutemov wrote:
> untagged_addr() removes tags/metadata from the address and brings it
> to
> the canonical form. The helper is implemented on arm64 and sparc.
> Both of
> them do untagging based on global rules.
>
> However, Linear Address Masking (LAM) on x86 introduces per-process
> settings for untagging. As a result, untagged_addr() is now only
> suitable for untagging addresses for the current proccess.
>
> The new helper untagged_addr_remote() has to be used when the address
> targets remote process. It requires the mmap lock for target mm to be
> taken.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> Tested-by: Alexander Potapenko <glider@google.com>

Seems to cover all the untagged_addr() cases that were operating on a
non-current MM.

Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
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