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1eb6c9cfc9
Extend kern_malloc.c internals to also cover contigmalloc(9) by a "slab cookie" and not just malloc/malloc_large. This allows us to call free(9) even on contigmalloc(9) addresses and deprecate contigfree(9). Update the contigmalloc(9) man page accordingly. The way this is done (free(9) working for contigmalloc) will hide the UMA/VM bits from a consumer which may otherwise need to know whether the original allocation was by malloc or contigmalloc by looking at the cookie (likely via an accessor function). This simplifies the implementation of consumers of mixed environments a lot. This is preliminary work to allow LinuxKPI to be adjusted to better play by the rules Linux puts out for various allocations. Most of this was described/explained to me by jhb. One may observe that realloc(9) is currently unchanged (and contrary to [contig]malloc/[contig]free an implementation may need access the "slab cookie" information given it will likely be implementation dependent which allocation type to use if size changes beyond the usable size of the initial allocation). Described by: jhb Sponsored by: The FreeBSD Foundation Reviewed by: markj, kib Differential Revision: https://reviews.freebsd.org/D45812 (cherry picked from commit 9e6544dd6e02c46b805d11ab925c4f3b18ad7a4b) |
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