On 2/25/22 12:28, He Zhe wrote: > We experienced system hang when using ramoops/ftrace. > > To avoid the deadlock causing the hang, rebase the patch in the following > link onto v5.10 as 4/9. 1/9, 2/9 and 3/9 are minimum basic change
typo, should have been 1/4 - 4/4. > backported from mainline. > > Link: https://lkml.org/lkml/2021/6/10/868 > > The code path of ftrace function tracer and the other users of it stays > unchanged. > > This has been tested on arm64 and intel-x86-64 hardwares and qemu. > > He Zhe (4): > ftrace: Move the recursion testing into global headers > ftrace: Add ftrace_test_recursion_trylock() helper function > pstore/ftrace: Add recursion protection to the ftrace callback > pstore/ftrace: Add and use ftrace_test_recursion_trylock_safe > > fs/pstore/ftrace.c | 11 ++ > include/linux/ftrace.h | 1 + > include/linux/trace_recursion.h | 242 ++++++++++++++++++++++++++++++++ > kernel/trace/trace.h | 156 -------------------- > 4 files changed, 254 insertions(+), 156 deletions(-) > create mode 100644 include/linux/trace_recursion.h > > > >
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