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| author |   Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2013-04-19 17:10:27 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2013-04-19 17:10:27 -0400 |
| commit | d2802d0739dcc61af5e5ea00773ce7ddead4e9c2 (patch) | |
| tree | 29d27970f8830dabeea7647479cc4bf9adda5929 /kernel/tracepoint.c | |
| parent | tracing: Remove obsolete macro guard _TRACE_PROFILE_INIT (diff) | |
| download | linux-dev-d2802d0739dcc61af5e5ea00773ce7ddead4e9c2.tar.xz linux-dev-d2802d0739dcc61af5e5ea00773ce7ddead4e9c2.zip | |
tracing: Compare to 1 instead of zero for is_signed_type()
The formats of the trace events show if the type of a event field
is signed or not via a macro called is_signed_type(). This does
a trick with the type and compares a -1 to zero after typecasting
to the tested type. If it returns true, it's signed, otherwise
its not. But this unfortunately triggers a warning by gcc:
warning: comparison of unsigned expression < 0 is always false
As we know it is always false (that's why we do it), this is a
false warning. Luckily for us, the comparison works with a 1 as
well, without giving the warning.
Convert the check to compare (type)-1 < (type)0 to (type)-1 < (type)1
to determine if the type is signed or not.
Link: http://lkml.kernel.org/r/CAErSpo4YXcY9fuOKWYGDkddJwk68kmZTohsmVB6QvrhjboOh1Q@mail.gmail.com
Reported-by: Bjorn Helgaas <bhelgaas@google.com>
Reported-by: Gary Hade <garyhade@us.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/tracepoint.c')
0 files changed, 0 insertions, 0 deletions