There is no 'struct page' for the source of this data. We have a kernel address for it; that's all. -----Original Message----- From: Leonid Yegoshin [mailto:Leonid.Yegoshin@xxxxxxxxxx] Sent: Tuesday, February 03, 2015 10:40 AM To: Guenter Roeck; Ralf Baechle Cc: linux-mips@xxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Atsushi Nemoto; Wilcox, Matthew R Subject: Re: mips: Re-introduce copy_user_page On 01/30/2015 09:23 PM, Guenter Roeck wrote: > Commit bcd022801ee5 ("MIPS: Fix COW D-cache aliasing on fork") replaced > the inline function copy_user_page for mips with an external reference, > but neglected to introduce the actual non-inline function. Restore it. > > Fixes: bcd022801ee5 ("MIPS: Fix COW D-cache aliasing on fork") > Fixes: 4927b7d77c00 ("dax,ext2: replace the XIP page fault handler with the DAX page fault handler") > Cc: Atsushi Nemoto <anemo@xxxxxxxxxxxxx> > Cc: Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx> > Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx> > Why do you use copy_user_page? It doesn't work properly in HIGHMEM environment and it is excluded from MIPS because of that, I believe. You should use copy_user_highpage() for user pages. - Leonid.
