ZONE_DMA is still used by some kernel drivers such as older sound and network
cards; it was already enabled on ARM and for some i686 kernels. Enable it
everywhere for consistency. The change was automated with:
$ git grep -rl CONFIG_ZONE_DMA | \
xargs sed 's/# CONFIG_ZONE_DMA is not set/CONFIG_ZONE_DMA=y/' -i
* gnu/packages/aux-files/linux-libre/4.14-x86_64.conf: Enable CONFIG_ZONE_DMA.
* gnu/packages/aux-files/linux-libre/4.19-x86_64.conf: Likewise.
* gnu/packages/aux-files/linux-libre/4.4-x86_64.conf: Likewise.
* gnu/packages/aux-files/linux-libre/4.9-x86_64.conf: Likewise.
* gnu/packages/aux-files/linux-libre/5.10-i686.conf: Likewise.
* gnu/packages/aux-files/linux-libre/5.10-x86_64.conf: Likewise.
* gnu/packages/aux-files/linux-libre/5.15-i686.conf: Likewise.
* gnu/packages/aux-files/linux-libre/5.15-x86_64.conf: Likewise.
* gnu/packages/aux-files/linux-libre/5.16-i686.conf: Likewise.
* gnu/packages/aux-files/linux-libre/5.16-x86_64.conf: Likewise.
* gnu/packages/aux-files/linux-libre/5.4-x86_64.conf: Likewise.