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

From: Greg Kroah-Hartman <[email-masked]>
Date: Thu, 15 Aug 2019 09:19:24 +0200

On Thu, Aug 15, 2019 at 02:55:42PM +1000, Alastair D'Silva wrote:
> From: Alastair D'Silva <[email-masked]>
> 
> Heads Up: This patch cannot be submitted to Linus's tree, as the affected
> assembler functions have already been converted to C.
> 
> 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.
> 
> Signed-off-by: Alastair D'Silva <[email-masked]>
> ---
>  arch/powerpc/kernel/misc_64.S | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>