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David Howells committed f8da7f44286
rxrpc: Abstract out the calculation of whether there's Tx space [ Upstream commit 158fe6665389964a1de212818b4a5c52b7f7aff4 ] Abstract out the calculation of there being sufficient Tx buffer space. This is reproduced several times in the rxrpc sendmsg code. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>