Messages in this thread | | | From | Geert Uytterhoeven <> | Date | Tue, 3 Oct 2017 20:11:59 +0200 | Subject | Re: [PATCH] ARM: head-common.S: Clear lr before jumping to start_kernel() |
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On Tue, Oct 3, 2017 at 5:37 PM, Nicolas Pitre <nicolas.pitre@linaro.org> wrote: > On Tue, 3 Oct 2017, Geert Uytterhoeven wrote: > >> If CONFIG_DEBUG_LOCK_ALLOC=y, the kernel log is spammed with a few >> hundred identical messages: >> >> unwind: Unknown symbol address c0800300 >> unwind: Index not found c0800300 >> >> c0800300 is the return address from the last subroutine call (to >> __memzero()) in __mmap_switched(). Apparently having this address in >> the link register confuses the unwinder. >> >> To fix this, reset the link register to zero before jumping to >> start_kernel(). >> >> Fixes: 9520b1a1b5f7a348 ("ARM: head-common.S: speed up startup code") >> Suggested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> >> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> > > Good! This fixes another similar case I had but I didn't come around to > look at closely yet. > > Acked-by: Nicolas Pitre <nico@linaro.org>
Thanks!
> Please send it to RMK's patch system.
Done (I hope so ;-)
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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