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Andy Whitcroft 29751f6991 [PATCH] sparsemem hotplug base ... Make sparse's initalization be accessible at runtime. This allows sparse mappings to be created after boot in a hotplug situation. This patch is separated from the previous one just to give an indication how much of the sparse infrastructure is *just* for hotplug memory. The section_mem_map doesn't really store a pointer. It stores something that is convenient to do some math against to get a pointer. It isn't valid to just do *section_mem_map, so I don't think it should be stored as a pointer. There are a couple of things I'd like to store about a section. First of all, the fact that it is !NULL does not mean that it is present. There could be such a combination where section_mem_map *is* NULL, but the math gets you properly to a real mem_map. So, I don't think that check is safe. Since we're storing 32-bit-aligned structures, we have a few bits in the bottom of the pointer to play with. Use one bit to encode whether there's really a mem_map there, and the other one to tell whether there's a valid section there. We need to distinguish between the two because sometimes there's a gap between when a section is discovered to be present and when we can get the mem_map for it. Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Jack Steiner <steiner@sgi.com> Signed-off-by: Bob Picco <bob.picco@hp.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		20 years ago
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Kconfig	[PATCH] sparsemem memory model	20 years ago
Makefile	[PATCH] sparsemem memory model	20 years ago
bootmem.c	[PATCH] sparsemem memory model	20 years ago
fadvise.c	…
filemap.c	…
fremap.c	…
highmem.c	…
hugetlb.c	…
internal.h	…
madvise.c	…
memory.c	[PATCH] sparsemem memory model	20 years ago
mempolicy.c	…
mempool.c	…
mincore.c	…
mlock.c	…
mmap.c	…
mprotect.c	…
mremap.c	…
msync.c	[PATCH] msync: check pte dirty earlier	20 years ago
nommu.c	…
oom_kill.c	…
page-writeback.c	…
page_alloc.c	[PATCH] sparsemem hotplug base	20 years ago
page_io.c	…
pdflush.c	…
prio_tree.c	…
readahead.c	…
rmap.c	[PATCH] can_share_swap_page: use page_mapcount	20 years ago
shmem.c	…
slab.c	…
sparse.c	[PATCH] sparsemem hotplug base	20 years ago
swap.c	…
swap_state.c	…
swapfile.c	[PATCH] can_share_swap_page: use page_mapcount	20 years ago
thrash.c	…
tiny-shmem.c	…
truncate.c	…
vmalloc.c	…
vmscan.c	…