Messages in this thread | | | Subject | Re: STRICT_KERNEL_RWX on PPC32 is broken on PowerMac G4 | From | Christophe LEROY <> | Date | Tue, 21 Nov 2017 10:58:31 +0100 |
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Le 21/11/2017 à 03:28, Balbir Singh a écrit : > On Sun, Nov 19, 2017 at 1:36 AM, LEROY Christophe > <christophe.leroy@c-s.fr> wrote: >> Meelis Roos <mroos@linux.ee> a écrit : >> >>>>>> How early does it hang ? Any oops or trace ? >>>>> >>>>> Very early - instead oif kernel emssages, I see some repeated gibberish >>>>> of some characteers, and the background turns white. >>>>> I am booting from yaboot, background is normally black. >>>> >>>> Ok, could you try by replacing #ifdef CONFIG_STRICT_KERNEL_RWX by #if 0 >>>> in arch/powerpc/lib/code-patching.c >>> >>> >>> With this change and CONFIG_STRICT_KERNEL_RWX=y, it still boots. >>> >>> BTW, I get these warnings (sorry for the word wrap from screen paste) - >>> may they be related or rather not? >>> >>> WRAP arch/powerpc/boot/zImage.pmac >>> WRAP arch/powerpc/boot/zImage.coff >>> WRAP arch/powerpc/boot/zImage.miboot >>> INFO: Uncompressed kernel (size 0x5d4c3c) overlaps the address of the >>> wrapper(0x400000) >>> INFO: Fixing the link_address of wrapper to (0x600000) >>> >> >> Then i believe there is something wrong with commit >> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?h=next-20171115&id=37bc3e5fd764fb258ff4fcbb90b6d1b67fb466c1 >> >> Balbir, do you have any idea ? >> > > Hmm.. interesting, so nobats works, but code-patching has issues? Any > chance you can boot with xmon=on on the command line > when you drop into the xmon> prompt, type dl to get the kernel log.
I have the same issue with a 83xx board allthought it is booting well on my 8xx boards.
Indeed the issue is that patch_instruction() is called from early_init(), therefor all static data must be addressed using PTRRELOC()
I have submitted a fixup patch, can you review it ? slab_is_available() cannot be called that early for the same reason but I believe it is not needed.
Christophe
> > Balbir Singh. >
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