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78cf0eb926
When update the latest mainline kernel with the following three configs,
the kernel hangs during startup:
(1) CONFIG_FUNCTION_GRAPH_TRACER=y
(2) CONFIG_PREEMPT_TRACER=y
(3) CONFIG_FTRACE_STARTUP_TEST=y
When update the latest mainline kernel with the above two configs (1)
and (2), the kernel starts normally, but it still hangs when execute
the following command:
echo "function_graph" > /sys/kernel/debug/tracing/current_tracer
Without CONFIG_PREEMPT_TRACER=y, the above two kinds of kernel hangs
disappeared, so it seems that CONFIG_PREEMPT_TRACER has some influences
with function_graph tracer at the first glance.
I use ejtag to find out the epc address is related with preempt_enable()
in the file arch/mips/lib/mips-atomic.c, because function tracing can
trace the preempt_{enable,disable} calls that are traced, replace them
with preempt_{enable,disable}_notrace to prevent function tracing from
going into an infinite loop, and then it can fix the kernel hang issue.
By the way, it seems that this commit is a complement and improvement of
commit
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.. | ||
bitops.c | ||
bswapdi.c | ||
bswapsi.c | ||
csum_partial.S | ||
delay.c | ||
dump_tlb.c | ||
iomap-pci.c | ||
iomap_copy.c | ||
libgcc.h | ||
Makefile | ||
memcpy.S | ||
memset.S | ||
mips-atomic.c | ||
multi3.c | ||
r3k_dump_tlb.c | ||
strncpy_user.S | ||
strnlen_user.S | ||
uncached.c |