s390/boot: fix use of expolines in the DMA code
The DMA code section of the decompressor must be compiled with expolines if Spectre V2 mitigation has been enabled for the decompressed kernel. This is required because although the decompressor's image contains the DMA code section, it is handed over to the decompressed kernel for use. Because the DMA code is already slow w/o expolines, use expolines always regardless whether the decompressed kernel is using them or not. This simplifies the DMA code by dropping the conditional compilation of expolines. Fixes: bf726301 ("s390: use proper expoline sections for .dma code") Cc: <stable@vger.kernel.org> # 5.2 Signed-off-by: NAlexander Egorenkov <egorenar@linux.ibm.com> Reviewed-by: NHeiko Carstens <hca@linux.ibm.com> Signed-off-by: NHeiko Carstens <hca@linux.ibm.com>
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