Re: [PATCH v8 01/16] scripts: link-vmlinux: Don't pass page offset to kallsyms if XIP Kernel

Am 21.05.2015 um 01:04 schrieb Andreas Färber:

Hi,

Am 18.05.2015 um 13:47 schrieb Maxime Coquelin:

quoted

2015-05-09 9:53 GMT+02:00 Maxime Coquelin [off-list ref]:

quoted

When Kernel is executed in place from ROM, the symbol addresses can be
lower than the page offset.

Tested-by: Chanwoo Choi <redacted>
Signed-off-by: Maxime Coquelin <redacted>

[...]

Back then on STM32F4 I debugged that disabling KALLSYMS works around it.

Now on a different XIP target I have confirmed this patch to help show a
stacktrace (my clk driver was missing some CLK_DIVIDER_ALLOW_ZEROs) ...
although my earlyprintk serial output still gets stuck further down the
stacktrace - probably unrelated.

FTR confirming my suspicion: insufficient power supply. ;)

Andreas

[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: CPU: 0 PID: 0 at drivers/clk/clk-divider.c:126
divider_recalc_rate+0x2b/0x44()
[    0.000000] SYS: Zero divisor and CLK_DIVIDER_ALLOW_ZERO not set
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted
4.1.0-rc4-next-20150519+ #23
[    0.000000] Hardware name: XMC4000 (Device Tree Support)
[    0.000000] [<0800bd5d>] (unwind_backtrace) from [<0800b0cb>]
(show_stack+0xb/0xc)
[    0.000000] [<0800b0cb>] (show_stack) from [<0800e0a5>]
(warn_slowpath_common+0x55/0x78)
[    0.000000] [<0800e0a5>] (warn_slowpath_common) from [<0800e103>]
(warn_slowpath_fmt+0x1b/0x24)
[    0.000000] [<0800e103>] (warn_slowpath_fmt) from [<080942e3>] (divide

But this is definitely an improvement for ARMv7-M debugging,

Tested-by: Andreas Färber <redacted>

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