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authorDan Magenheimer <dan.magenheimer@oracle.com>2013-04-30 15:26:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 17:04:00 -0700
commit905cd0e1bf9ffe82d6906a01fd974ea0f70be97a (patch)
treee0ca87ed9b6e05b452d548d5d3ebbb6b48c70a34 /usr
parent421348f1ca0bf17769dee0aed4d991845ae0536d (diff)
mm: frontswap: lazy initialization to allow tmem backends to build/run as modules
With the goal of allowing tmem backends (zcache, ramster, Xen tmem) to be built/loaded as modules rather than built-in and enabled by a boot parameter, this patch provides "lazy initialization", allowing backends to register to frontswap even after swapon was run. Before a backend registers all calls to init are recorded and the creation of tmem_pools delayed until a backend registers or until a frontswap store is attempted. Signed-off-by: Stefan Hengelein <ilendir@googlemail.com> Signed-off-by: Florian Schmaus <fschmaus@gmail.com> Signed-off-by: Andor Daam <andor.daam@googlemail.com> Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com> [v1: Fixes per Seth Jennings suggestions] [v2: Removed FRONTSWAP_HAS_.. ] [v3: Fix up per Bob Liu <lliubbo@gmail.com> recommendations] [v4: Fix up per Andrew's comments] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Bob Liu <lliubbo@gmail.com> Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com> Cc: Dan Magenheimer <dan.magenheimer@oracle.com> Cc: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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