diff options
Diffstat (limited to 'target/linux/generic/backport-4.14/080-v4.15-0001-arch-define-weak-abort.patch')
| -rw-r--r-- | target/linux/generic/backport-4.14/080-v4.15-0001-arch-define-weak-abort.patch | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/target/linux/generic/backport-4.14/080-v4.15-0001-arch-define-weak-abort.patch b/target/linux/generic/backport-4.14/080-v4.15-0001-arch-define-weak-abort.patch new file mode 100644 index 0000000000..2d247a39e4 --- /dev/null +++ b/target/linux/generic/backport-4.14/080-v4.15-0001-arch-define-weak-abort.patch @@ -0,0 +1,51 @@ +From 7c2c11b208be09c156573fc0076b7b3646e05219 Mon Sep 17 00:00:00 2001 +From: Sudip Mukherjee <sudipm.mukherjee@gmail.com> +Date: Thu, 14 Dec 2017 15:33:19 -0800 +Subject: [PATCH] arch: define weak abort() + +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> +--- + kernel/exit.c | 8 ++++++++ + 1 file changed, 8 insertions(+) + +diff --git a/kernel/exit.c b/kernel/exit.c +index 6b4298a41167..df0c91d5606c 100644 +--- a/kernel/exit.c ++++ b/kernel/exit.c +@@ -1755,3 +1755,11 @@ COMPAT_SYSCALL_DEFINE5(waitid, + return -EFAULT; + } + #endif ++ ++__weak void abort(void) ++{ ++ BUG(); ++ ++ /* if that doesn't kill us, halt */ ++ panic("Oops failed to kill thread"); ++} +-- +2.11.0 + |