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READ_ONCE() introduced from v3.19 commit 230fa253df63 ("kernel: Provide READ_ONCE and ASSIGN_ONCE") and ACCESS_ONCE() removed startibg from v4.15-rc4 commit b899a850431e ("compiler.h: Remove ACCESS_ONCE()") Replace ACCESS_ONCE with READ_ONCE and make READ_ONCE wrapper for case when READ_ONCE is not available (<v3.19) This will fix build with v4.15 Signed-off-by: Roman Stratiienko <roman.stratiienko@globallogic.com> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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