[PATCH v2] powerpc: Allow flush_(inval_)dcache_range to work across ranges >4GB

[Greg Kroah-Hartman]

On Wed, Aug 21, 2019 at 10:19:27AM +1000, Alastair D'Silva wrote:
> From: Alastair D'Silva <alastair at d-silva.org>
> 
> The upstream commit:
> 22e9c88d486a ("powerpc/64: reuse PPC32 static inline flush_dcache_range()")
> has a similar effect, but since it is a rewrite of the assembler to C, is
> too invasive for stable. This patch is a minimal fix to address the issue in
> assembler.
> 
> This patch applies cleanly to v5.2, v4.19 & v4.14.
> 
> When calling flush_(inval_)dcache_range with a size >4GB, we were masking
> off the upper 32 bits, so we would incorrectly flush a range smaller
> than intended.
> 
> This patch replaces the 32 bit shifts with 64 bit ones, so that
> the full size is accounted for.
> 
> Changelog:
> v2
>   - Add related upstream commit

Now applied, thanks.

greg k-h