Hi,
On Thu, Aug 08, 2013 at 12:08:56AM +0100, Russell King - ARM Linux wrote:
> On Wed, Aug 07, 2013 at 10:05:21PM +0300, Aaro Koskinen wrote:
> > On Wed, Aug 07, 2013 at 02:26:09AM +0300, Aaro Koskinen wrote:
> > > I get the following on Amstrad Delta (E3) when booting unpatched
> > > v3.11-rc4. The kernel config is after the crash.
> >
> > This is regression introduced between -rc3 and -rc4. According to the
> > git bisect, the first bad commit is:
> >
> > commit e39e3f3ebfef03450cf7bfa7a974a8c61f7980c8
> > Author: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
> > Date: Tue Jul 9 01:03:17 2013 +0100
> >
> > ARM: update FIQ support for relocation of vectors
> >
> > If I revert the commit from v3.11-rc4, the board boots fine.
> >
> > A.
> >
> > > Uncompressing Linux... done, booting the kernel.
> > > [ 0.000000] Booting Linux on physical CPU 0x0
> > > [ 0.000000] Initializing cgroup subsys cpu
> > > [ 0.000000] Linux version 3.11.0-rc4-e3 (aaro@blackmetal) (gcc version 4.7.3 (GCC) ) #4 PREEMPT Wed Aug 7 02:03:27 EEST 2013
> > > [ 0.000000] bootconsole [earlycon0] enabled
> > > [ 0.000000] OMAP1510
> > > [ 0.000000] revision 2 handled as 15xx id: bc058c9b93111a16
>
> Hmm, so ARM925T which is VIVT...
>
> > > [ 0.238868] Installing fiq handler from c001b110, length 0x164
> > > [ 0.245750] Unable to handle kernel paging request at virtual address ffff1224
>
> In one way, that's good news - that's public independent proof that the
> code associated with the vectors is well protected from kernel writes. :)
>
> Can you try this (untested) patch please? We need to write into this
> page via the page's alias, rather than directly to it. Thanks.
That seems to work - the board boots fine to shell as before. Feel free
to add Reported-by: or Tested-by: from me to the patch.
Thanks,
A.
> arch/arm/kernel/fiq.c | 8 ++------
> 1 files changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/kernel/fiq.c b/arch/arm/kernel/fiq.c
> index 25442f4..fc79202 100644
> --- a/arch/arm/kernel/fiq.c
> +++ b/arch/arm/kernel/fiq.c
> @@ -84,17 +84,13 @@ int show_fiq_list(struct seq_file *p, int prec)
>
> void set_fiq_handler(void *start, unsigned int length)
> {
> -#if defined(CONFIG_CPU_USE_DOMAINS)
> - void *base = (void *)0xffff0000;
> -#else
> void *base = vectors_page;
> -#endif
> unsigned offset = FIQ_OFFSET;
>
> memcpy(base + offset, start, length);
> + if (!cache_is_vipt_nonaliasing())
> + flush_icache_range(base + offset, offset + length);
> flush_icache_range(0xffff0000 + offset, 0xffff0000 + offset + length);
> - if (!vectors_high())
> - flush_icache_range(offset, offset + length);
> }
>
> int claim_fiq(struct fiq_handler *f)
>
>
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