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SubjectRe: [PATCH v4 4/5] lib/ioremap: Ensure phys_addr actually corresponds to a physical address
On Mon, Nov 26, 2018 at 05:07:46PM +0000, Will Deacon wrote:
> The current ioremap() code uses a phys_addr variable at each level of
> page table, which is confusingly offset by subtracting the base virtual
> address being mapped so that adding the current virtual address back on
> when iterating through the page table entries gives back the corresponding
> physical address.
>
> This is fairly confusing and results in all users of phys_addr having to
> add the current virtual address back on. Instead, this patch just updates
> phys_addr when iterating over the page table entries, ensuring that it's
> always up-to-date and doesn't require explicit offsetting.
>
> Cc: Chintan Pandya <cpandya@codeaurora.org>
> Cc: Toshi Kani <toshi.kani@hpe.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Sean Christopherson <sean.j.christopherson@intel.com>
> Signed-off-by: Will Deacon <will.deacon@arm.com>

Tested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>

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