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David S. Miller
fbb192a836
Jakub Kicinski says: ==================== net: skbuff: hide some bitfield members There is a number of protocol or subsystem specific fields in struct sk_buff which are only accessed by one subsystem. We can wrap them in ifdefs with minimal code impact. This gives us a better chance to save a 2B and a 4B holes resulting with the following savings (assuming a lucky kernel config): - /* size: 232, cachelines: 4, members: 28 */ - /* sum members: 227, holes: 1, sum holes: 4 */ - /* sum bitfield members: 8 bits (1 bytes) */ + /* size: 224, cachelines: 4, members: 28 */ /* forced alignments: 2 */ - /* last cacheline: 40 bytes */ + /* last cacheline: 32 bytes */ I think that the changes shouldn't be too controversial. The only one I'm not 100% sure of is the SCTP one, 12 extra LoC for one bit.. But it did fit squarely in the "this bit has only one user" category. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> Acked-by: Simon Horman <horms@kernel.org>
Linux kernel
============
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