sparc64: Use kernel page tables for vmemmap.

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[ Upstream commit c06240c7f5 ]

For sparse memory configurations, the vmemmap array behaves terribly
and it takes up an inordinate amount of space in the BSS section of
the kernel image unconditionally.

Just build huge PMDs and look them up just like we do for TLB misses
in the vmalloc area.

Kernel BSS shrinks by about 2MB.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Bob Picco <bob.picco@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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David S. Miller 2014-09-24 21:20:14 -07:00 • committed by Greg Kroah-Hartman

parent 86f7cda184

commit c4bcde7ec5

3 changed files with 36 additions and 56 deletions

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9

arch/sparc/kernel/ktlb.S

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72

arch/sparc/mm/init_64.c

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11

arch/sparc/mm/init_64.h

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