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Currently kcov instrument is disabled for object files under
arch/x86/kernel folder.
For object files under arch/x86/kernel, actually just disabling the kcov
instrument of files:"head32.o or head64.o and sev.o" could achieve
successful booting and provide kcov coverage for object files that do not
disable kcov instrument. The additional kcov coverage collected from
arch/x86/kernel folder helps kernel fuzzing efforts to find bugs.
Link to related improvement discussion is below:
https://groups.google.com/g/syzkaller/c/Dsl-RYGCqs8/m/x-tfpTyFBAAJ Related
ticket is as follow: https://bugzilla.kernel.org/show_bug.cgi?id=198443
Link: https://lkml.kernel.org/r/06c0bb7b5f61e5884bf31180e8c122648c752010.1690771380.git.pengfei.xu@intel.com
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Pengfei Xu <pengfei.xu@intel.com>
Cc: Aleksandr Nogikh <nogikh@google.com>
Cc: <heng.su@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Kees Cook <keescook@google.com>,
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Sohil Mehta <sohil.mehta@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
0d345996e4