bootmem: Add free_bootmem_late()

Add a new function for freeing bootmem after the bootmem
allocator has been released and the unreserved pages given to
the page allocator.

This allows us to reserve bootmem and then release it if we
later discover it was not needed.

( This new API will be used by the swiotlb code to recover
  a significant amount of RAM (64MB). )

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: chrisw@sous-sol.org
Cc: dwmw2@infradead.org
Cc: joerg.roedel@amd.com
Cc: muli@il.ibm.com
Cc: hannes@cmpxchg.org
Cc: tj@kernel.org
Cc: akpm@linux-foundation.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <1257849980-22640-7-git-send-email-fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h
index dd97fb8408a8..b10ec49ee2dd 100644
--- a/include/linux/bootmem.h
+++ b/include/linux/bootmem.h
@@ -53,6 +53,7 @@ extern void free_bootmem_node(pg_data_t *pgdat,
                               unsigned long addr,
                               unsigned long size);
 extern void free_bootmem(unsigned long addr, unsigned long size);
+extern void free_bootmem_late(unsigned long addr, unsigned long size);
 
 /*
  * Flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,