On 12/01/17 at 10:42am, Michal Hocko wrote:
> On Fri 01-12-17 17:29:51, Dave Young wrote:
> > On 12/01/17 at 10:19am, Michal Hocko wrote:
> > > On Fri 01-12-17 16:56:57, Dave Young wrote:
> > > > On 11/30/17 at 10:35am, Michal Hocko wrote:
> > > [...]
> > > > > Can we exclude that range from the me
On Fri 01-12-17 17:29:51, Dave Young wrote:
> On 12/01/17 at 10:19am, Michal Hocko wrote:
> > On Fri 01-12-17 16:56:57, Dave Young wrote:
> > > On 11/30/17 at 10:35am, Michal Hocko wrote:
> > [...]
> > > > Can we exclude that range from the memblock allocator instead? E.g. what
> > > > happens if s
On 12/01/17 at 10:19am, Michal Hocko wrote:
> On Fri 01-12-17 16:56:57, Dave Young wrote:
> > On 11/30/17 at 10:35am, Michal Hocko wrote:
> [...]
> > > Can we exclude that range from the memblock allocator instead? E.g. what
> > > happens if somebody allocates from that range?
> >
> > It is a EFI
On Fri 01-12-17 16:56:57, Dave Young wrote:
> On 11/30/17 at 10:35am, Michal Hocko wrote:
[...]
> > Can we exclude that range from the memblock allocator instead? E.g. what
> > happens if somebody allocates from that range?
>
> It is a EFI BGRT image buffer provided by firmware, they are reserved
On 11/30/17 at 12:25pm, Pavel Tatashin wrote:
> Hi Dave,
>
> Because unavailable memory can be in the middle of a section, I think
> a proper fix would be to do pfn_valid() check only at the beginning of
> section. Otherwise, we might miss zeroing a struct page is in the
> middle of a section but
On 11/30/17 at 10:35am, Michal Hocko wrote:
> On Thu 30-11-17 14:04:31, Dave Young wrote:
> > With latest kernel I get below bug while testing kdump:
> >
> > [0.00] BUG: unable to handle kernel paging request at
> > ea00034b1040
> > [0.00] IP: zero_resv_unavail+0xbd/0x126
> >
Hi Dave,
Because unavailable memory can be in the middle of a section, I think
a proper fix would be to do pfn_valid() check only at the beginning of
section. Otherwise, we might miss zeroing a struct page is in the
middle of a section but pfn_valid() could potentially return false as
that page i
On Thu 30-11-17 14:04:31, Dave Young wrote:
> With latest kernel I get below bug while testing kdump:
>
> [0.00] BUG: unable to handle kernel paging request at ea00034b1040
> [0.00] IP: zero_resv_unavail+0xbd/0x126
> [0.00] PGD 37b98067 P4D 37b98067 PUD 37b97067 PMD 0
With latest kernel I get below bug while testing kdump:
[0.00] BUG: unable to handle kernel paging request at ea00034b1040
[0.00] IP: zero_resv_unavail+0xbd/0x126
[0.00] PGD 37b98067 P4D 37b98067 PUD 37b97067 PMD 0
[0.00] Oops: 0002 [#1] SMP
[0.00] Modu
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