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Dezember 2025 10:54 > Betreff: Re: HIGHMEM freeing patch breaks Realtek RTL930x builds >=20 > Hi Markus, > > On Sat, Dec 20, 2025 at 09:57:40AM +0100, markus.stockhausen@gmx.de wrot= e: > > Hi, > >=20 > > sorry for being late on this topic but downstream OpenWrt just started > > kernel > > conversion from 6.12 to 6.18 these days. During preparation of the PR > > https://github.com/openwrt/openwrt/pull/21181 we noticed that Realtek= =20 > > RTL930x soc based devices with more than 256MB (highmem) do not boot= =20 > > any longer.=20 > >=20 > > These are MIPS 34k 32bit multithreaded SoC with layout=20 > > <0x00000000 0x10000000>, /* 256 MiB lowmem */ > > <0x20000000 0x10000000>; /* 256 MiB highmem */ > >=20 > > Bisecting the issue gave " arch, mm: streamline HIGHMEM freeing"=20 > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ > > ?h=3Dv6.15-rc1&id=3D6faea3422e3b4e8de44a55aa3e6e843320da66d2 > > as the first bad commit. This is back from the 6.15 times. > >=20 > > I have no real idea why removing mem_init_free_highmem() and letting > > __free_memory_core() work on the whole memory range gives issues. > >=20 > > We are aligning to upstream very slowly and are still in need of=20 > > downstream patches so here some additional info. > >=20 > > - Until now we never cared about FLATMEM/SPARSEMEM configs > >=20 > > - We are still using dedicated prom.c/setup.c for the devices > > https://git.openwrt.org/?p=3Dopenwrt/openwrt.git;a=3Dtree;f=3Dtarget/l= inux/ > > realtek/files-6.12/arch/mips/rtl838x;hb=3DHEAD > >=20 > > Any idea or hint is appreciated. > > Can you please send logs from a working kernel and a failing kernel with > "memblock=3Ddebug" added to the kernel command line? Good hint. I've done that and collected all information in https://github.com/openwrt/openwrt/issues/21323 > Another thing I think worth checking is will the system boot with a partial > revert of 6faea3422e3b ("arch, mm: streamline HIGHMEM freeing") for mips= : Will try this out next, update the issue and inform you here. Thank you Markus