On Fri, Dec 2, 2016 at 11:22 AM, Fabian Frederick <[email protected]> wrote: > Commit 5f29a77cd957 > ("mm: fix mixed zone detection in devm_memremap_pages") > Aligned resource limits before region_intersects() which breaks > the following with false assertions on kernel command line: memmap=4M!700M > > "devm_memremap_pages attempted on mixed region [ mem 0x2bc00000-0x2bfffff > flags 0x200]" > > Memory regions > 0x100000-0x2bbfffff: usable > 0x2bc000000-0x2bbfffff: persistent > 0x2c0000000-0x2bffffff: usable > > resource start: 0x2bc00000 > align start: 0x28000000 > resource size: 0x3fffffff > align size: 0x80000000 > SECTION_SIZE: 0x8000000 > > Now we need aligned memmap declarations based on 128M in this case > eg memmap=128!640M > > Signed-off-by: Fabian Frederick <[email protected]> > --- > kernel/memremap.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/kernel/memremap.c b/kernel/memremap.c > index b501e39..1bb5eec 100644 > --- a/kernel/memremap.c > +++ b/kernel/memremap.c > @@ -296,8 +296,8 @@ void *devm_memremap_pages(struct device *dev, struct > resource *res, > IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE); > > if (is_ram == REGION_MIXED) { > - WARN_ONCE(1, "%s attempted on mixed region %pr\n", > - __func__, res); > + WARN_ONCE(1, "%s attempted on mixed region %pr or arguments > not aligned to section size: %#lx\n", > + __func__, res, SECTION_SIZE); > return ERR_PTR(-ENXIO); > }
This should be addressed by the sub-section hotplug patches: "[PATCH 00/11] mm: sub-section memory hotplug support" https://lkml.org/lkml/2016/12/1/740
