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    SubjectRe: [PATCH] zsmalloc: use unsigned long instead of void *
    On Tue, May 22, 2012 at 08:42:10AM -0500, Seth Jennings wrote:
    > On 05/21/2012 09:19 AM, Seth Jennings wrote:
    >
    > > On 05/20/2012 09:23 PM, Minchan Kim wrote:
    > >
    > >> We should use unsigned long as handle instead of void * to avoid any
    > >> confusion. Without this, users may just treat zs_malloc return value as
    > >> a pointer and try to deference it.
    > >
    > >
    > > I wouldn't have agreed with you about the need for this change as people
    > > should understand a void * to be the address of some data with unknown
    > > structure.
    > >
    > > However, I recently discussed with Dan regarding his RAMster project
    > > where he assumed that the void * would be an address, and as such,
    > > 4-byte aligned. So he has masked two bits into the two LSBs of the
    > > handle for RAMster, which doesn't work with zsmalloc since the handle is
    > > not an address.
    > >
    > > So really we do need to convey as explicitly as possible to the user
    > > that the handle is an _opaque_ value about which no assumption can be made.
    >
    >
    > Wasn't really clear here. All that to say, I think we do need this patch.

    That sounds like an Acked-by ?

    >
    > Thanks,
    > Seth


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