Will Deacon 777e0b0cb7 BACKPORT: arm64: Add support for SB barrier and patch in over DSB; ISB sequences ... We currently use a DSB; ISB sequence to inhibit speculation in set_fs(). Whilst this works for current CPUs, future CPUs may implement a new SB barrier instruction which acts as an architected speculation barrier. On CPUs that support it, patch in an SB; NOP sequence over the DSB; ISB sequence and advertise the presence of the new instruction to userspace. Signed-off-by: Will Deacon <will.deacon@arm.com> Change-Id: I28e2640aff2734576f64c508cef83ad411e8d3ab		2022-11-12 11:21:30 +00:00
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asm	BACKPORT: arm64: Add support for SB barrier and patch in over DSB; ISB sequences	2022-11-12 11:21:30 +00:00