On Wed, Aug 07, 2013 at 10:05:21PM +0300, Aaro Koskinen wrote:
> Hi,
>
> 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.
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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