52 lines
1.6 KiB
Diff
52 lines
1.6 KiB
Diff
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From 7c2c11b208be09c156573fc0076b7b3646e05219 Mon Sep 17 00:00:00 2001
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From: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
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Date: Thu, 14 Dec 2017 15:33:19 -0800
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Subject: [PATCH] arch: define weak abort()
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gcc toggle -fisolate-erroneous-paths-dereference (default at -O2
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onwards) isolates faulty code paths such as null pointer access, divide
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by zero etc. If gcc port doesnt implement __builtin_trap, an abort() is
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generated which causes kernel link error.
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In this case, gcc is generating abort due to 'divide by zero' in
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lib/mpi/mpih-div.c.
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Currently 'frv' and 'arc' are failing. Previously other arch was also
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broken like m32r was fixed by commit d22e3d69ee1a ("m32r: fix build
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failure").
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Let's define this weak function which is common for all arch and fix the
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problem permanently. We can even remove the arch specific 'abort' after
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this is done.
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Link: http://lkml.kernel.org/r/1513118956-8718-1-git-send-email-sudipm.mukherjee@gmail.com
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Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
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Cc: Alexey Brodkin <Alexey.Brodkin@synopsys.com>
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Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com>
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Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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---
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kernel/exit.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/kernel/exit.c b/kernel/exit.c
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index 6b4298a41167..df0c91d5606c 100644
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--- a/kernel/exit.c
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+++ b/kernel/exit.c
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@@ -1755,3 +1755,11 @@ COMPAT_SYSCALL_DEFINE5(waitid,
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return -EFAULT;
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}
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#endif
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+
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+__weak void abort(void)
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+{
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+ BUG();
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+
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+ /* if that doesn't kill us, halt */
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+ panic("Oops failed to kill thread");
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+}
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--
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2.11.0
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