Ravi Bangoria 5b905d7798 powerpc/watchpoint: Fix exception handling for CONFIG_HAVE_HW_BREAKPOINT=N ... On powerpc, ptrace watchpoint works in one-shot mode. i.e. kernel disables event every time it fires and user has to re-enable it. Also, in case of ptrace watchpoint, kernel notifies ptrace user before executing instruction. With CONFIG_HAVE_HW_BREAKPOINT=N, kernel is missing to disable ptrace event and thus it's causing infinite loop of exceptions. This is especially harmful when user watches on a data which is also read/written by kernel, eg syscall parameters. In such case, infinite exceptions happens in kernel mode which causes soft-lockup. Fixes: 9422de3e95 ("powerpc: Hardware breakpoints rewrite to handle non DABR breakpoint registers") Reported-by: Pedro Miraglia Franco de Carvalho <pedromfc@linux.ibm.com> Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200902042945.129369-6-ravi.bangoria@linux.ibm.com		2020-09-15 22:13:20 +10:00
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asm	powerpc/watchpoint: Fix exception handling for CONFIG_HAVE_HW_BREAKPOINT=N	2020-09-15 22:13:20 +10:00
uapi/asm	Revert "powerpc/64s: Remove PROT_SAO support"	2020-08-24 14:12:53 +10:00