]> git.proxmox.com Git - mirror_ubuntu-disco-kernel.git/commit
sparse-vmemmap: specify vmemmap population range in bytes
authorJohannes Weiner <hannes@cmpxchg.org>
Mon, 29 Apr 2013 22:07:50 +0000 (15:07 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Mon, 29 Apr 2013 22:54:35 +0000 (15:54 -0700)
commit0aad818b2de455f1bfd7ef87c28cdbbaaed9a699
treea86fe62f7c740d431f76bd2262abae5825e1a21e
parent055e4fd96e95b0eee0d92fd54a26be7f0d3bcad0
sparse-vmemmap: specify vmemmap population range in bytes

The sparse code, when asking the architecture to populate the vmemmap,
specifies the section range as a starting page and a number of pages.

This is an awkward interface, because none of the arch-specific code
actually thinks of the range in terms of 'struct page' units and always
translates it to bytes first.

In addition, later patches mix huge page and regular page backing for
the vmemmap.  For this, they need to call vmemmap_populate_basepages()
on sub-section ranges with PAGE_SIZE and PMD_SIZE in mind.  But these
are not necessarily multiples of the 'struct page' size and so this unit
is too coarse.

Just translate the section range into bytes once in the generic sparse
code, then pass byte ranges down the stack.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Bernhard Schmidt <Bernhard.Schmidt@lrz.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: David S. Miller <davem@davemloft.net>
Tested-by: David S. Miller <davem@davemloft.net>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/arm64/mm/mmu.c
arch/ia64/mm/discontig.c
arch/powerpc/mm/init_64.c
arch/s390/mm/vmem.c
arch/sparc/mm/init_64.c
arch/x86/mm/init_64.c
include/linux/mm.h
mm/sparse-vmemmap.c
mm/sparse.c