linux-kernel - [PATCH] arch: define weak abort

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Date:   Mon, 11 Dec 2017 21:26:08 +0000
From:   Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>
Subject: [PATCH] arch: define weak abort

gcc was generating abort due to 'divide by zero' and if it is not
defined in the toolchain the build fails.

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

Lets 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.

Cc: Alexey Brodkin <Alexey.Brodkin@...opsys.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
---
 kernel/exit.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/kernel/exit.c b/kernel/exit.c
index af6c245..90c6869 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1759,3 +1759,11 @@ long kernel_wait4(pid_t upid, int __user *stat_addr, int options,
 	return -EFAULT;
 }
 #endif
+
+__weak void abort(void)
+{
+	BUG();
+
+	/* if that doesn't kill us, halt */
+	panic("Oops failed to kill thread");
+}
-- 
1.9.1