tracing: Quiet gcc warning about maybe unused link variable

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commit 2519c1bbe3 upstream.

Commit 57ea2a34ad ("tracing/kprobes: Fix trace_probe flags on
enable_trace_kprobe() failure") added an if statement that depends on another
if statement that gcc doesn't see will initialize the "link" variable and
gives the warning:

 "warning: 'link' may be used uninitialized in this function"

It is really a false positive, but to quiet the warning, and also to make
sure that it never actually is used uninitialized, initialize the "link"
variable to NULL and add an if (!WARN_ON_ONCE(!link)) where the compiler
thinks it could be used uninitialized.

Fixes: 57ea2a34ad ("tracing/kprobes: Fix trace_probe flags on enable_trace_kprobe() failure")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Steven Rostedt (VMware) 2018-07-25 22:28:56 -04:00 • committed by Ben Hutchings

parent 23b5d9e43e

commit 9f6f9db5c9

1 changed files with 4 additions and 2 deletions

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kernel/trace/trace_kprobe.c

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