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android_kernel_motorola_sm6375/tools/objtool
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Filename Latest commit message Latest commit date
Josh Poimboeuf b1547d3101 objtool: Detect falling through to the next function 
There are several cases in compiled C code where a function may not
return at the end, and may instead fall through to the next function.

That may indicate a bug in the code, or a gcc bug, or even an objtool
bug.  But in each case, objtool reports an unhelpful warning, something
like:

  drivers/scsi/qla2xxx/qla_attr.o: warning: objtool: qla2x00_get_fc_host_stats()+0x0: duplicate frame pointer save
  drivers/scsi/qla2xxx/qla_attr.o: warning: objtool: qla2x00_get_fc_host_stats()+0x0: frame pointer state mismatch

Detect this situation and print a more useful error message:

  drivers/scsi/qla2xxx/qla_attr.o: warning: objtool: qla2x00_get_host_fabric_name() falls through to next function qla2x00_get_starget_node_name()

Also add some information about this warning and its potential causes to
the documentation.

Reported-by: kbuild test robot <[email protected]>
Signed-off-by: Josh Poimboeuf <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/caa4ec6c687931db805e692d4e4bf06cd87d33e6.1460729697.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <[email protected]>
2016-04-16 11:14:17 +02:00
..
arch/x86 x86/asm/decoder: Use explicitly signed chars 2016-03-03 16:13:00 +01:00
Documentation objtool: Detect falling through to the next function 2016-04-16 11:14:17 +02:00
.gitignore objtool: Add tool to perform compile-time stack metadata validation 2016-02-29 08:35:12 +01:00
arch.h objtool: Add tool to perform compile-time stack metadata validation 2016-02-29 08:35:12 +01:00
Build objtool: Add tool to perform compile-time stack metadata validation 2016-02-29 08:35:12 +01:00
builtin-check.c objtool: Detect falling through to the next function 2016-04-16 11:14:17 +02:00
builtin.h objtool: Add tool to perform compile-time stack metadata validation 2016-02-29 08:35:12 +01:00
elf.c objtool: Add several performance improvements 2016-03-09 10:48:10 +01:00
elf.h objtool: Add several performance improvements 2016-03-09 10:48:10 +01:00
Makefile objtool: Compile with debugging symbols 2016-03-09 10:48:08 +01:00
objtool.c objtool: Add tool to perform compile-time stack metadata validation 2016-02-29 08:35:12 +01:00
special.c objtool: Add tool to perform compile-time stack metadata validation 2016-02-29 08:35:12 +01:00
special.h objtool: Add tool to perform compile-time stack metadata validation 2016-02-29 08:35:12 +01:00
warn.h objtool: Add tool to perform compile-time stack metadata validation 2016-02-29 08:35:12 +01:00