Hi Linus,
On Mon, Jun 15, 2020 at 11:11:04AM +0200, Linus Walleij wrote:
> OK I would be very happy to look at it so I can learn a bit about the
> hands-on and general approach here. Just send it to this address
> directly and I will look!
Have sent it
> > For the next 3 weeks, right now, i
Hi Afzal!
On Fri, Jun 12, 2020 at 12:25 PM afzal mohammed wrote:
> > > Note that this was done on a topic branch for user copy. Changes for
> > > kernel static mapping to vmalloc has not been merged with these.
> > > Also having kernel lowmem w/ a separate asid & switching at kernel
> > >
Hi,
On Wed, Jun 10, 2020 at 12:10:21PM +0200, Linus Walleij wrote:
> On Mon, Jun 8, 2020 at 1:09 PM afzal mohammed wrote:
> > Not yet. Yes, i will do the performance evaluation.
> >
> > i am also worried about the impact on performance as these
> > [ get_user_pages() or friends, kmap_atomic() ]
On Mon, Jun 8, 2020 at 1:09 PM afzal mohammed wrote:
> On Sun, Jun 07, 2020 at 05:11:16PM +0100, Russell King - ARM Linux admin
> wrote:
> > On Sun, Jun 07, 2020 at 06:29:32PM +0530, afzal mohammed wrote:
>
> > > get_user_pages_fast() followed by kmap_atomic() & then memcpy() seems
> > > to work
On Tue, Jun 9, 2020 at 2:15 PM afzal mohammed wrote:
> On Mon, Jun 08, 2020 at 08:47:27PM +0530, afzal mohammed wrote:
> > On Mon, Jun 08, 2020 at 04:43:57PM +0200, Arnd Bergmann wrote:
>
> > > There is another difference: get_user_pages_fast() does not return
> > > a vm_area_struct pointer,
Hi,
On Mon, Jun 08, 2020 at 08:47:27PM +0530, afzal mohammed wrote:
> On Mon, Jun 08, 2020 at 04:43:57PM +0200, Arnd Bergmann wrote:
> > There is another difference: get_user_pages_fast() does not return
> > a vm_area_struct pointer, which is where you would check the access
> > permissions. I
Hi,
On Mon, Jun 08, 2020 at 04:43:57PM +0200, Arnd Bergmann wrote:
> There is another difference: get_user_pages_fast() does not return
> a vm_area_struct pointer, which is where you would check the access
> permissions. I suppose those pointers could not be returned to callers
> that don't
On Mon, Jun 8, 2020 at 1:18 PM afzal mohammed wrote:
> On Sun, Jun 07, 2020 at 09:26:26PM +0200, Arnd Bergmann wrote:
>
> > I think you have to use get_user_pages() though instead of
> > get_user_pages_fast(),
> > in order to be able to check the permission bits to prevent doing a
> >
Hi,
On Sun, Jun 07, 2020 at 09:26:26PM +0200, Arnd Bergmann wrote:
> I think you have to use get_user_pages() though instead of
> get_user_pages_fast(),
> in order to be able to check the permission bits to prevent doing a
> copy_to_user()
> into read-only mappings.
i was not aware of this, is
Hi,
[ my previous mail did not make into linux-arm-kernel mailing list,
got a mail saying it has a suspicious header and that it is waiting
moderator approval ]
On Sun, Jun 07, 2020 at 05:11:16PM +0100, Russell King - ARM Linux admin wrote:
> On Sun, Jun 07, 2020 at 06:29:32PM +0530, afzal
On Sun, Jun 7, 2020 at 2:59 PM afzal mohammed wrote:
> On Sat, May 16, 2020 at 09:35:57AM +0200, Arnd Bergmann wrote:
> > On Sat, May 16, 2020 at 8:06 AM afzal mohammed
> > wrote:
>
> > > Okay, so the conclusion i take is,
> > > 1. VMSPLIT 4G/4G have to live alongside highmem
> > > 2. For user
On Sun, Jun 07, 2020 at 06:29:32PM +0530, afzal mohammed wrote:
> Hi,
>
> On Sat, May 16, 2020 at 09:35:57AM +0200, Arnd Bergmann wrote:
> > On Sat, May 16, 2020 at 8:06 AM afzal mohammed
> > wrote:
>
> > > Okay, so the conclusion i take is,
> > > 1. VMSPLIT 4G/4G have to live alongside
Hi,
On Sat, May 16, 2020 at 09:35:57AM +0200, Arnd Bergmann wrote:
> On Sat, May 16, 2020 at 8:06 AM afzal mohammed
> wrote:
> > Okay, so the conclusion i take is,
> > 1. VMSPLIT 4G/4G have to live alongside highmem
> > 2. For user space copy, do pinning followed by kmap
> Right, though
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