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SubjectRe: [PATCH v2 4/4] arm64: drop pfn_valid_within() and simplify pfn_valid()
On Wed, Apr 21, 2021 at 04:36:46PM +0530, Anshuman Khandual wrote:
>
> On 4/21/21 12:21 PM, Mike Rapoport wrote:
> > From: Mike Rapoport <rppt@linux.ibm.com>
> >
> > The arm64's version of pfn_valid() differs from the generic because of two
> > reasons:
> >
> > * Parts of the memory map are freed during boot. This makes it necessary to
> > verify that there is actual physical memory that corresponds to a pfn
> > which is done by querying memblock.
> >
> > * There are NOMAP memory regions. These regions are not mapped in the
> > linear map and until the previous commit the struct pages representing
> > these areas had default values.
> >
> > As the consequence of absence of the special treatment of NOMAP regions in
> > the memory map it was necessary to use memblock_is_map_memory() in
> > pfn_valid() and to have pfn_valid_within() aliased to pfn_valid() so that
> > generic mm functionality would not treat a NOMAP page as a normal page.
> >
> > Since the NOMAP regions are now marked as PageReserved(), pfn walkers and
> > the rest of core mm will treat them as unusable memory and thus
> > pfn_valid_within() is no longer required at all and can be disabled by
> > removing CONFIG_HOLES_IN_ZONE on arm64.
>
> This makes sense.
>
> >
> > pfn_valid() can be slightly simplified by replacing
> > memblock_is_map_memory() with memblock_is_memory().
> >
> > Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> > ---
> > arch/arm64/Kconfig | 3 ---
> > arch/arm64/mm/init.c | 4 ++--
> > 2 files changed, 2 insertions(+), 5 deletions(-)
> >
> > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> > index e4e1b6550115..58e439046d05 100644
> > --- a/arch/arm64/Kconfig
> > +++ b/arch/arm64/Kconfig
> > @@ -1040,9 +1040,6 @@ config NEED_PER_CPU_EMBED_FIRST_CHUNK
> > def_bool y
> > depends on NUMA
> >
> > -config HOLES_IN_ZONE
> > - def_bool y
> > -
>
> Right.
>
> > source "kernel/Kconfig.hz"
> >
> > config ARCH_SPARSEMEM_ENABLE
> > diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> > index dc03bdc12c0f..eb3f56fb8c7c 100644
> > --- a/arch/arm64/mm/init.c
> > +++ b/arch/arm64/mm/init.c
> > @@ -243,7 +243,7 @@ int pfn_valid(unsigned long pfn)
> >
> > /*
> > * ZONE_DEVICE memory does not have the memblock entries.
> > - * memblock_is_map_memory() check for ZONE_DEVICE based
> > + * memblock_is_memory() check for ZONE_DEVICE based
> > * addresses will always fail. Even the normal hotplugged
> > * memory will never have MEMBLOCK_NOMAP flag set in their
> > * memblock entries. Skip memblock search for all non early
> > @@ -254,7 +254,7 @@ int pfn_valid(unsigned long pfn)
> > return pfn_section_valid(ms, pfn);
> > }
> > #endif
> > - return memblock_is_map_memory(addr);
> > + return memblock_is_memory(addr);
>
> Wondering if MEMBLOCK_NOMAP is now being treated similarly to other
> memory pfns for page table walking purpose but with PageReserved(),
> why memblock_is_memory() is still required ? At this point, should
> not we just return valid for early_section() memory. As pfn_valid()
> now just implies that pfn has a struct page backing which has been
> already verified with valid_section() etc.

memblock_is_memory() is required because arm64 frees unused parts of the
memory map. So, for instance, if we have 64M out of 128M populated in a
section the section based calculation would return 1 for a pfn in the
second half of the section, but there would be no memory map there.


> > }
> > EXPORT_SYMBOL(pfn_valid);
> >
> >

--
Sincerely yours,
Mike.

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