Hannes Frederic Sowa e5a2c89995
fast_hash: avoid indirect function calls ...
By default the arch_fast_hash hashing function pointers are initialized
to jhash(2). If during boot-up a CPU with SSE4.2 is detected they get
updated to the CRC32 ones. This dispatching scheme incurs a function
pointer lookup and indirect call for every hashing operation.
rhashtable as a user of arch_fast_hash e.g. stores pointers to hashing
functions in its structure, too, causing two indirect branches per
hashing operation.
Using alternative_call we can get away with one of those indirect branches.
Acked-by: Daniel Borkmann <dborkman@redhat.com >
Cc: Thomas Graf <tgraf@suug.ch >
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org >
Signed-off-by: David S. Miller <davem@davemloft.net >
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