arch: define weak abort()

commit 7c2c11b208be09c156573fc0076b7b3646e05219 upstream.

gcc toggle -fisolate-erroneous-paths-dereference (default at -O2
onwards) isolates faulty code paths such as null pointer access, divide
by zero etc.  If gcc port doesnt implement __builtin_trap, an abort() is
generated which causes kernel link error.

In this case, gcc is generating abort due to 'divide by zero' in
lib/mpi/mpih-div.c.

Currently 'frv' and 'arc' are failing.  Previously other arch was also
broken like m32r was fixed by commit d22e3d69ee1a ("m32r: fix build
failure").

Let's define this weak function which is common for all arch and fix the
problem permanently.  We can even remove the arch specific 'abort' after
this is done.

Link: http://lkml.kernel.org/r/1513118956-8718-1-git-send-email-sudipm.mukherjee@gmail.com
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Alexey Brodkin <Alexey.Brodkin@synopsys.com>
Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Evgeniy Didin <Evgeniy.Didin@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/exit.c b/kernel/exit.c
index f6cad39f35dfbe441abc5fc740458a6574e7d529..5a0c4791473c3cb7a5135ea2c3ea3c39afd95b38 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1755,3 +1755,11 @@ Efault:
        return -EFAULT;
 }
 #endif
+
+__weak void abort(void)
+{
+       BUG();
+
+       /* if that doesn't kill us, halt */
+       panic("Oops failed to kill thread");
+}