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sparse-vmemmap: specify vmemmap population range in bytes

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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>
This commit is contained in:
Johannes Weiner 2013-04-29 15:07:50 -07:00 • committed by Linus Torvalds
parent 055e4fd96e
commit 0aad818b2d
9 changed files with 49 additions and 56 deletions
Download patch file Download diff file Expand all files Collapse all files

10
mm/sparse.c
View file

@ -615,11 +615,17 @@ static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid,
}
static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
{
vmemmap_free(memmap, nr_pages);
unsigned long start = (unsigned long)memmap;
unsigned long end = (unsigned long)(memmap + nr_pages);
vmemmap_free(start, end);
}
static void free_map_bootmem(struct page *memmap, unsigned long nr_pages)
{
vmemmap_free(memmap, nr_pages);
unsigned long start = (unsigned long)memmap;
unsigned long end = (unsigned long)(memmap + nr_pages);
vmemmap_free(start, end);
}
#else
static struct page *__kmalloc_section_memmap(unsigned long nr_pages)