diff options
| author | Vegard Nossum <vegard.nossum@oracle.com> | 2016-05-21 17:46:10 +0200 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2016-08-04 00:18:06 +0200 |
| commit | 915eed20e40f4dcb142cb29a3de6f6ba67f4bb5a (patch) | |
| tree | dc606eee62b4f6ed16b456450c4cc3523aab719f /arch/x86 | |
| parent | 8e99bc70468dcc42a756ca4b100e2fb2c30c4c89 (diff) | |
um: Support kcov
This adds support for kcov to UML.
There is a small problem where UML will randomly segfault during boot;
this is because current_thread_info() occasionally returns an invalid
(non-NULL) pointer and we try to dereference it in
__sanitizer_cov_trace_pc(). I consider this a bug in UML itself and this
patch merely exposes it.
[v2: disable instrumentation in UML-specific code]
Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Thomas Meyer <thomas@m3y3r.de>
Cc: user-mode-linux-devel <user-mode-linux-devel@lists.sourceforge.net>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/um/vdso/Makefile | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/um/vdso/Makefile b/arch/x86/um/vdso/Makefile index 6c803ca49b5d..d72dec406ccb 100644 --- a/arch/x86/um/vdso/Makefile +++ b/arch/x86/um/vdso/Makefile @@ -2,6 +2,9 @@ # Building vDSO images for x86. # +# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. +KCOV_INSTRUMENT := n + VDSO64-y := y vdso-install-$(VDSO64-y) += vdso.so |