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configure: Check for membarrier support #1704

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configure: Check for membarrier support #1704

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Commits on Jul 6, 2023

  1. configure: Check for membarrier support 

    Runtime dynamic patching requires cache synchronization. This is best
achieved by using the 'MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE'
memory barrier. However it was introduced in Linux 4.16. We set a flag
indicating whether this membarrier can be used or if libmcount has to
rely on other mechanisms (e.g. signals).

Signed-off-by: Cl茅ment Guidi <cguidi@ciena.com>
    @clementguidi
    clementguidi committed Jul 6, 2023
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