Speaker
Description
There is a lot of similar and duplicated code in architecture specific
bits of memory management.
For instance, most architectures have
#define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO)
for allocating page table pages and many of them use similar, if not
identical, implementation of pte_alloc_one*().
But that's only the tip of the iceberg.
There are several early_alloc() or similarily called routines that do
if (slab_is_available())
return kzalloc();
else
return memblock_alloc();
Some other trivial examples are free_initmem(), free_initrd_mem()
which were nearly identical accross many architectures until very
recently.
More complex cases are per-cpu initialization, passing of memory topology
to the generic MM, reservation of crash kernel, mmap of vdso etc. They
are not really duplicated, but still are very similar in at least
several architectures.
While factoring out the common code is an obvious step to take, I
believe there is also room for refining arch <-> mm interface to avoid
adding extra HAVE_ARCH_NO_BOOTMEM^w^wWHAT_NOT and then searching for the
ways to get rid of them.
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