xtensa: add -mno-serialize-volatile to CFLAGS

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By default xtensa gcc inserts memw for all volatile object accesses.
This is too pessimistic for the kernel: there should be no "normal"
volatile objects, and all special objects, like MMIO or objects shared
between CPUs should have explicit barriers.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

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Max Filippov 2017-04-28 09:40:00 -07:00

parent bebc6082da

commit 7bf5234db7

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arch/xtensa/Makefile

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