diff options
| author | Ravi Bangoria <ravi.bangoria@linux.ibm.com> | 2019-09-10 18:45:13 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-09-12 09:27:00 +1000 |
| commit | bc01bdf6c5df5023272a7399962cf64f8fedc93e (patch) | |
| tree | 9db2aba85bd44e99947b35a548a782b05c804240 /arch/sh/lib/memcpy-sh4.S | |
| parent | 587164cd593c2cbdad376179f85159e31221989e (diff) | |
powerpc/watchpoint: Disable watchpoint hit by larx/stcx instructions
If watchpoint exception is generated by larx/stcx instructions, the
reservation created by larx gets lost while handling exception, and
thus stcx instruction always fails. Generally these instructions are
used in a while(1) loop, for example spinlocks. And because stcx
never succeeds, it loops forever and ultimately hangs the system.
Note that ptrace anyway works in one-shot mode and thus for ptrace
we don't change the behaviour. It's up to ptrace user to take care
of this.
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190910131513.30499-1-ravi.bangoria@linux.ibm.com
Diffstat (limited to 'arch/sh/lib/memcpy-sh4.S')
0 files changed, 0 insertions, 0 deletions