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Gcov's internal data structures, on which the kernel depends on, have
changed in GCC 4.6. This patch adds support for GCC 4.6 and should still
work on GCC 4.4 too.
For reference, look at 'struct gcov_fn_info' in GCC's 'gcc/gcov-io.h',
near line 698:
https://android.googlesource.com/toolchain/gcc/+/master/gcc-4.4.3/
https://android.googlesource.com/toolchain/gcc/+/master/gcc-4.6/
Bug 1003822
Change-Id: I527736f944c80b8b345d1685669c0b99eb38fb66
Signed-off-by: Tuomas Tynkkynen <ttynkkynen@nvidia.com>
Reviewed-on: http://git-master/r/110073
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Juha Tukkinen <jtukkinen@nvidia.com>
Tested-by: Juha Tukkinen <jtukkinen@nvidia.com>
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Based on work done for LTP in
http://ltp.cvs.sourceforge.net/viewvc/ltp/utils/analysis/gcov-kernel
Patch originates from Motorola kernel team (mkw348@motorola.com).
Change-Id: Ibb2a7c8afd79051e8d6c7fde83f04745be14f5fd
Signed-off-by: Juha Tukkinen <jtukkinen@nvidia.com>
Reviewed-on: http://git-master/r/62997
Reviewed-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Reviewed-by: Scott Williams <scwilliams@nvidia.com>
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>
Rebase-Id: R67557d023bc94fbe900bfc9deef2f5de9955ea43
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Enable the use of GCC's coverage testing tool gcov [1] with the Linux
kernel. gcov may be useful for:
* debugging (has this code been reached at all?)
* test improvement (how do I change my test to cover these lines?)
* minimizing kernel configurations (do I need this option if the
associated code is never run?)
The profiling patch incorporates the following changes:
* change kbuild to include profiling flags
* provide functions needed by profiling code
* present profiling data as files in debugfs
Note that on some architectures, enabling gcc's profiling option
"-fprofile-arcs" for the entire kernel may trigger compile/link/
run-time problems, some of which are caused by toolchain bugs and
others which require adjustment of architecture code.
For this reason profiling the entire kernel is initially restricted
to those architectures for which it is known to work without changes.
This restriction can be lifted once an architecture has been tested
and found compatible with gcc's profiling. Profiling of single files
or directories is still available on all platforms (see config help
text).
[1] http://gcc.gnu.org/onlinedocs/gcc/Gcov.html
Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Li Wei <W.Li@Sun.COM>
Cc: Michael Ellerman <michaele@au1.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Heiko Carstens <heicars2@linux.vnet.ibm.com>
Cc: Martin Schwidefsky <mschwid2@linux.vnet.ibm.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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