I've been mentioning the issue several times, but the OpenWRT x86 builds really don't seem to fit well. As such several x86 kernel configuration adjustments I think are appropriate.
First, a side issue. The "# CONFIG_<name> is not set" was meant for use by tools. Theory being almost all options would default to "no" therefore this implied the person doing configuration had left them alone. Setting an option to "n" is more common when configurations are handled manually. Most tools work perfectly with this and I suggest this should be preferred, when appropriate, going forward. First up is the simple observation CONFIG_FB_NOTIFY disappeared at some point. Since it no longer does anything, the setting should be purged. Next up is some bits related to hardware random-number generators. I notice rather more kernel configuration files set CONFIG_HW_RANDOM to yes than set it to no. As such having the default be yes is a win. Right now this is a mild improvement, but HW RNGs are becoming more common so this should improve over time. I also found support for the Geode HW random number generator had gotten into the common x86 configuration. I imagine having the support is advantageous to Geode devices. Anything else it is disadvantageous. What originally brought the Geode HW RNG situation to my attention was noticing CONFIG_SCx200. Appears CONFIG_SCx200 is part of the Geode platform. Similar to the previous I don't doubt Geode systems need the driver. Non-Geode x86 though simply don't. Appears the architecture type CONFIG_M<proc> values need to be set to something. They should all be unset in the common file though. All of the subtargets explicitly specify some processor. Now we come to the item I've mentioned. The X32 ABI. This is running an amd64 processor in amd64 mode, but truncating all pointers to 32 bits (ILP32 mode). This shrinks the runtime size of programs in exchange for limiting them to a maximum of 4GB of memory. The result is often a significant speed increase over both i386 and amd64 modes, largely due to reducing memory use. For rather a lot of programs, 4GB of memory is plenty. Have you ever observed `ls` or a shell use anywhere near that much? The fact most devices running OpenWRT don't have that much *total* memory says the limitation is worthwhile. The difficulty is this means bringing up a new toolchain. While the deltas are small, compilers, linkers and libc all need minor adjustments. The other question is whether to have separate amd64 (or "64") and x32 builds, versus a single combined one. Looks like little of ISA remained on "64", yet some DMA support remained due to the generic configuration. Remove the ISA and ISA DMA support from the top-level configuration. Geode and Legacy though almost certainly still need ISA support. In case someone doesn't know, "AGP" is short for "Accelerated Graphics Port". This was an interim standard when graphics cards in the late 1990s were overwhelming PCI, but PCI-Express wasn't yet available. Since OpenWRT is a router distribution, this doesn't seem like a good fit. If you've got such an Intel board, this will reduce graphics performance, but will release ~.5MB extra memory for better uses. The Direct Rendering Manager was created in association with XFree86. The goal was making graphics faster and moving some things which had been implemented in XFree86, but really needed to be in the kernel into the kernel. I suspect Wayland may well depend on some or all of this. Yet isn't OpenWRT's target embedded network devices? This is something needed for a graphics desktop, not an embedded networking devices (unless you're trying to create X-terminals). As such this also seems like a misfit for OpenWRT/x86. Elliott Mitchell (9): kernel/generic: remove CONFIG_FB_NOTIFY kernel: change CONFIG_HW_RANDOM default to y kernel/x86: move Geode HW random from generic to geode kernel/x86: move SCx200 support from generic to geode kernel/x86: remove CONFIG_M686 from common configuration kernel/x86: enable x32 support for amd64 kernel/x86: remove all ISA support from non-legacy kernel/x86: remove support for AGP kernel/x86: remove DRM support target/linux/airoha/config-5.15 | 1 - target/linux/apm821xx/config-5.10 | 1 - target/linux/apm821xx/config-5.15 | 1 - target/linux/archs38/config-5.10 | 1 + target/linux/archs38/config-5.15 | 1 + target/linux/armvirt/32/config-5.10 | 1 + target/linux/armvirt/32/config-5.15 | 1 + target/linux/armvirt/64/config-5.10 | 1 - target/linux/armvirt/64/config-5.15 | 1 - target/linux/ath25/config-5.10 | 1 - target/linux/ath79/config-5.10 | 1 + target/linux/ath79/config-5.15 | 1 + target/linux/bcm47xx/config-5.10 | 1 - target/linux/bcm47xx/config-5.15 | 1 - target/linux/bcm4908/config-5.10 | 1 + target/linux/bcm4908/config-5.15 | 1 + target/linux/bcm53xx/config-5.10 | 1 - target/linux/bcm53xx/config-5.15 | 1 - target/linux/bcm63xx/config-5.15 | 1 - target/linux/gemini/config-5.10 | 1 + target/linux/gemini/config-5.15 | 1 - target/linux/generic/config-5.10 | 3 +- target/linux/generic/config-5.15 | 3 +- target/linux/imx/config-5.15 | 1 - target/linux/ipq40xx/config-5.15 | 1 - target/linux/ipq806x/config-5.10 | 1 - target/linux/ipq806x/config-5.15 | 1 - target/linux/ipq807x/config-5.15 | 1 + target/linux/kirkwood/config-5.10 | 1 - target/linux/kirkwood/config-5.15 | 1 - target/linux/lantiq/ase/config-5.10 | 1 - target/linux/lantiq/ase/config-5.15 | 1 - target/linux/lantiq/falcon/config-5.10 | 1 + target/linux/lantiq/falcon/config-5.15 | 1 + target/linux/lantiq/xrx200/config-5.10 | 1 - target/linux/lantiq/xrx200/config-5.15 | 1 - target/linux/lantiq/xway/config-5.10 | 1 - target/linux/lantiq/xway/config-5.15 | 1 - target/linux/lantiq/xway_legacy/config-5.10 | 1 + target/linux/lantiq/xway_legacy/config-5.15 | 1 + target/linux/malta/config-5.10 | 1 + target/linux/malta/config-5.15 | 1 + target/linux/mpc85xx/config-5.10 | 1 - target/linux/mpc85xx/config-5.15 | 1 - target/linux/mvebu/config-5.10 | 1 - target/linux/mvebu/config-5.15 | 1 - target/linux/mxs/config-5.15 | 1 + target/linux/octeon/config-5.10 | 1 - target/linux/octeon/config-5.15 | 1 - target/linux/octeontx/config-5.15 | 1 - target/linux/omap/config-5.10 | 1 - target/linux/omap/config-5.15 | 1 - target/linux/oxnas/config-5.15 | 1 + target/linux/pistachio/config-5.10 | 1 + target/linux/pistachio/config-5.15 | 1 + target/linux/qoriq/config-5.15 | 1 - target/linux/sunxi/config-5.15 | 1 - target/linux/tegra/config-5.10 | 1 + target/linux/tegra/config-5.15 | 1 + target/linux/uml/config-5.10 | 1 - target/linux/uml/config-5.15 | 1 - target/linux/x86/64/config-5.10 | 46 ------------------ target/linux/x86/64/config-5.15 | 46 ------------------ target/linux/x86/config-5.10 | 16 +++--- target/linux/x86/config-5.15 | 16 +++--- target/linux/x86/generic/config-5.10 | 51 ------------------- target/linux/x86/generic/config-5.15 | 51 ------------------- target/linux/x86/geode/config-5.10 | 8 ++- target/linux/x86/geode/config-5.15 | 8 ++- target/linux/x86/legacy/config-5.10 | 54 +-------------------- target/linux/x86/legacy/config-5.15 | 54 +-------------------- target/linux/zynq/config-5.15 | 1 + 72 files changed, 55 insertions(+), 361 deletions(-) -- (\___(\___(\______ --=> 8-) EHM <=-- ______/)___/)___/) \BS ( | ehem+open...@m5p.com PGP 87145445 | ) / \_CS\ | _____ -O #include <stddisclaimer.h> O- _____ | / _/ 8A19\___\_|_/58D2 7E3D DDF4 7BA6 <-PGP-> 41D1 B375 37D0 8714\_|_/___/5445 _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
