Kernel 4.7: PAGE_GUARDED and _PAGE_NO_CACHE

[Michael Ellerman]

On Wed, 2016-06-08 at 12:58 +0200, Christian Zigotzky wrote:
> On 08 June 2016 at 04:52 AM, Michael Ellerman wrote:
> > On Tue, 2016-06-07 at 22:17 +0200, Christian Zigotzky wrote:
> > > 764041e0f43cc7846f6d8eb246d65b53cc06c764 is the first bad commit
> > > commit 764041e0f43cc7846f6d8eb246d65b53cc06c764
> > > Author: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
> > > Date:   Fri Apr 29 23:26:09 2016 +1000
> > > 
> > >      powerpc/mm/radix: Add checks in slice code to catch radix usage
> > > 
> > >      Radix doesn't need slice support. Catch incorrect usage of slice code
> > >      when radix is enabled.
> > > 
> > >      Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
> > >      Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
> > > 
> > Hmm, I find that hard to believe. But maybe I'm missing something.
> > 
> > Can you checkout Linus' master and then revert that commit?
> > 
> $ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git linux-git
> $ git checkout
> Your branch is up-to-date with 'origin/master'.
> 
> $ git revert 764041e0f43cc7846f6d8eb246d65b53cc06c764 -m 1
> error: Mainline was specified but commit 764041e0f43cc7846f6d8eb246d65b53cc06c764 is not a merge.
> fatal: revert failed
> 
> How can I checkout Linus' master and then revert that commit?

It's not a merge, so just plain git revert:

  $ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git linux-git
  $ cd linux-git
  $ git revert 764041e0f43cc7846f6d8eb246d65b53cc06c764
  [master 5dd9737a173e] Revert "powerpc/mm/radix: Add checks in slice code to catch radix usage"
   1 file changed, 16 deletions(-)

cheers