Subject: [PATCH] ARM:mm: fix kmap_atomic_to_page

From: [email-masked] (Jongsung Kim)
Date: Tue, 13 Oct 2015 11:06:44 +0900

On 10/12/2015 06:27 PM, Arnd Bergmann wrote:
> How about changing the zcomp code to pass the page pointer instead of the kernel space pointer? That would avoid having to do the kmap_atomic, which can itself be expensive on 32-bit machines and should not be needed here if you have a HW DMA engine doing the compression. Arnd 

Mainline zram uses lzo / lz4 library functions as backend. Using kmap_atomic and passing address look reasonable.