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| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2021-11-08 14:13:01 -0800 |
|---|---|---|
| committer | Josh Poimboeuf <jpoimboe@redhat.com> | 2021-11-08 14:24:00 -0800 |
| commit | c2ac7c02d14aef631c5f705226594d5227ea4337 (patch) | |
| tree | af9a71fc47b3aa8e107f596f7ab3a0a60c4bec82 | |
| parent | 87c87ecd00c54ecd677798cb49ef27329e0fab41 (diff) | |
| download | linux-c2ac7c02d14aef631c5f705226594d5227ea4337.tar.gz | |
compiler.h: Fix annotation macro misplacement with Clangobjtool-compiler-annotation-macro-fixes
When building with Clang and CONFIG_TRACE_BRANCH_PROFILING, there are a
lot of unreachable warnings, like:
arch/x86/kernel/traps.o: warning: objtool: handle_xfd_event()+0x134: unreachable instruction
Without an inline asm input, 'volatile' is ignored for some reason and
Clang feels free to move the reachable() annotation away from its
intended location.
Fix that by re-adding the counter value to the inputs.
Fixes: f1069a8756b9 ("compiler.h: Avoid using inline asm operand modifiers")
Fixes: c199f64ff93c ("instrumentation.h: Avoid using inline asm operand modifiers")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
| -rw-r--r-- | include/linux/compiler.h | 4 | ||||
| -rw-r--r-- | include/linux/instrumentation.h | 4 |
2 files changed, 4 insertions, 4 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 3d5af56337bdb..429dcebe2b992 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -121,7 +121,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val, asm volatile(__stringify_label(c) ":\n\t" \ ".pushsection .discard.reachable\n\t" \ ".long " __stringify_label(c) "b - .\n\t" \ - ".popsection\n\t"); \ + ".popsection\n\t" : : "i" (c)); \ }) #define annotate_reachable() __annotate_reachable(__COUNTER__) @@ -129,7 +129,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val, asm volatile(__stringify_label(c) ":\n\t" \ ".pushsection .discard.unreachable\n\t" \ ".long " __stringify_label(c) "b - .\n\t" \ - ".popsection\n\t"); \ + ".popsection\n\t" : : "i" (c)); \ }) #define annotate_unreachable() __annotate_unreachable(__COUNTER__) diff --git a/include/linux/instrumentation.h b/include/linux/instrumentation.h index fa2cd8c63dcc9..24359b4a96053 100644 --- a/include/linux/instrumentation.h +++ b/include/linux/instrumentation.h @@ -11,7 +11,7 @@ asm volatile(__stringify(c) ": nop\n\t" \ ".pushsection .discard.instr_begin\n\t" \ ".long " __stringify(c) "b - .\n\t" \ - ".popsection\n\t"); \ + ".popsection\n\t" : : "i" (c)); \ }) #define instrumentation_begin() __instrumentation_begin(__COUNTER__) @@ -50,7 +50,7 @@ asm volatile(__stringify(c) ": nop\n\t" \ ".pushsection .discard.instr_end\n\t" \ ".long " __stringify(c) "b - .\n\t" \ - ".popsection\n\t"); \ + ".popsection\n\t" : : "i" (c)); \ }) #define instrumentation_end() __instrumentation_end(__COUNTER__) #else |