Re: [PATCH v8 00/14] Convert powerpc to default topdown mmap layout (v8)

Christophe Leroy [off-list ref] writes:

Hi Michael, hi Andrew

Le 09/03/2022 à 18:44, Christophe Leroy a écrit :

quoted

Rebased on top of powerpc/next branch

This series converts powerpc to default topdown mmap layout.

powerpc requires its own arch_get_unmapped_area() only when
slices are needed, which is only for book3s/64. First part of
the series moves slices into book3s/64 specific directories
and cleans up other subarchitectures.

Last part converts to default topdown mmap layout.

A small modification is done to core mm to allow
powerpc to still provide its own arch_randomize_brk()

Another modification is done to core mm to allow powerpc
to use generic versions of get_unmapped_area functions for Radix
while still providing its own implementation for Hash, the
selection between Radix and Hash being doing at runtime.

Last modification to core mm is to give len and flags to
arch_get_mmap_end().

Signed-off-by: Christophe Leroy <redacted>

What's the way forward for this series ?

It's a bit of a tricky series.

Patches 1 has been merged in PCI tree.

That's fine I guess, it can go into v5.18, it's only patch 14 that
depends on it.

Patches 2 to 5 are core mm, patch 5 being a fix.

A fix for arm64 even, just to complicate things :)

Then patches 6 to 14 are powerpc.

With a fairly sizable diffstat, ie. likely to conflict.

What will be the merge strategy ? I guess it's a bit late to get it 
through powerpc tree, so I was just wondering whether we could get 
patches 2 to 5 in mm this cycle, and the powerpc ones next cycle ?

Yeah I didn't pick it up because the mm changes don't have many acks and
I'm always nervous about carrying generic mm changes.

It would be my preference if Andrew could take 2-5 through mm for v5.18,
but it is quite late, so I'm not sure how he will feel about that.

Arguably 2, 3, 4 do very little. It's only patch 5 that has much effect,
and it has a reviewed-by from Catalin at least.

cheers

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