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SubjectRe: [PATCH 01/16] mm: use untagged_addr() for get_user_pages_fast addresses
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On 6/11/19 8:40 AM, Christoph Hellwig wrote:
> This will allow sparc64 to override its ADI tags for
> get_user_pages and get_user_pages_fast.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---

Commit message is sparc64 specific but the goal here is to allow any
architecture with memory tagging to use this. So I would suggest
rewording the commit log. Other than that:

Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com>

> mm/gup.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/mm/gup.c b/mm/gup.c
> index ddde097cf9e4..6bb521db67ec 100644
> --- a/mm/gup.c
> +++ b/mm/gup.c
> @@ -2146,7 +2146,7 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
> unsigned long flags;
> int nr = 0;
>
> - start &= PAGE_MASK;
> + start = untagged_addr(start) & PAGE_MASK;
> len = (unsigned long) nr_pages << PAGE_SHIFT;
> end = start + len;
>
> @@ -2219,7 +2219,7 @@ int get_user_pages_fast(unsigned long start, int nr_pages,
> unsigned long addr, len, end;
> int nr = 0, ret = 0;
>
> - start &= PAGE_MASK;
> + start = untagged_addr(start) & PAGE_MASK;
> addr = start;
> len = (unsigned long) nr_pages << PAGE_SHIFT;
> end = start + len;
>


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