On 11/02/2012 06:48:40 AM, Martijn de Gouw wrote:
Hi,
The following commit:
http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=commit;h=e49b1fae0ba4d06b29bd753a961abb447566bf4a
causes confusion, because it prints "Machine check in kernel mode"
also when the bus error is actually in user space. When using RapidIO
memory mapped access, and the device is removed or powered off, then
a bus error is generated. This is on a freescale mpc8548 powerpc. Due
to removing the user_mode check, the kernel calls "die" which causes
the process to die with a BUS error, regardless of having a SIGBUS
handler or not.
Therefore I request to put this check back, and even to put the
removed code at the top of the machine check handler because there is
no point in trying to recover from a user space bus error anyway.
Why is there no point trying to recover? For example, see MCSR_ICPERR
and MCSR_DCPERR_MC in machine_check_e500mc. The machine check is just
letting us know that there was an error and the read-only cache got
dumped (i.e. it was a correctable error).
-Scott
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