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Matt Morehouse
bb3a3da38d
Unmapping and remapping is dangerous since another thread could touch the shadow memory while it is unmapped. But there is really no need to unmap anyway, since mmap(MAP_FIXED) will happily clobber the existing mapping with zeroes. This is thread-safe since the mmap() is done under the same kernel lock as page faults are done. Reviewed By: vitalybuka Differential Revision: https://reviews.llvm.org/D85947