| commit | 6e4c890e15b23f078650499fbde11760b8eccf10 | |
| author | Cao jin <caoj.fnst@cn.fujitsu.com> | |
| Wed, 2 Nov 2016 13:44:47 +0000 (2 21:44 +0800) | ||
| committer | Michael Tokarev <mjt@tls.msk.ru> | |
| Tue, 24 Jan 2017 20:26:53 +0000 (24 23:26 +0300) | ||
| tree | 0c606e5587a6c6a59b10d297e19ef9f5ca48f6a8 | treesnapshot (tar.gz zip) |
| parent | 4a3ecf201a1a49a804e8506df5906e446707c3b1 | commitdiff |
util/mmap-alloc: refactor a little bit for readability
1st mmap returns *ptr* which aligns to host page size,
| size + align |
------------------------------------------
ptr
input param *align* could be 1M, or 2M, or host page size. After
QEMU_ALIGN_UP, offset will >= 0
2nd mmap use flag MAP_FIXED, then it return ptr+offset, or else fail.
If it success, then we will have something like:
| offset | size |
--------------------------------------
ptr ptr1
*ptr1* is what we really want to return, it equals ptr+offset.
Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
1st mmap returns *ptr* which aligns to host page size,
| size + align |
------------------------------------------
ptr
input param *align* could be 1M, or 2M, or host page size. After
QEMU_ALIGN_UP, offset will >= 0
2nd mmap use flag MAP_FIXED, then it return ptr+offset, or else fail.
If it success, then we will have something like:
| offset | size |
--------------------------------------
ptr ptr1
*ptr1* is what we really want to return, it equals ptr+offset.
Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
| util/mmap-alloc.c | diffblobblamehistory |