[PATCH 5.8 362/633] powerpc/watchpoint: Add hw_len wherever missing

Greg Kroah-Hartman
2020-10-27T15:09:18Z

From: Ravi Bangoria <ravi.bangoria@linux.ibm.com>

[ Upstream commit 58da5984d2ea6d95f3f9d9e8dd9f7e1b0dddfb3c ]

There are couple of places where we set len but not hw_len. For
ptrace/perf watchpoints, when CONFIG_HAVE_HW_BREAKPOINT=Y, hw_len
will be calculated and set internally while parsing watchpoint.
But when CONFIG_HAVE_HW_BREAKPOINT=N, we need to manually set
'hw_len'. Similarly for xmon as well, hw_len needs to be set
directly.

Fixes: b57aeab811db ("powerpc/watchpoint: Fix length calculation for unaligned target")
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/20200902042945.129369-7-ravi.bangoria@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/powerpc/kernel/ptrace/ptrace-noadv.c | 1 +
arch/powerpc/xmon/xmon.c | 1 +
2 files changed, 2 insertions(+)

diff --git a/arch/powerpc/kernel/ptrace/ptrace-noadv.c b/arch/powerpc/kernel/ptrace/ptrace-noadv.c
index 697c7e4b5877f..8bd8d8de5c40b 100644
--- a/arch/powerpc/kernel/ptrace/ptrace-noadv.c
+++ b/arch/powerpc/kernel/ptrace/ptrace-noadv.c
@@ -219,6 +219,7 @@ long ppc_set_hwdebug(struct task_struct *child, struct ppc_hw_breakpoint *bp_inf
brk.address = ALIGN_DOWN(bp_info->addr, HW_BREAKPOINT_SIZE);
brk.type = HW_BRK_TYPE_TRANSLATE;
brk.len = DABR_MAX_LEN;
+ brk.hw_len = DABR_MAX_LEN;
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
brk.type |= HW_BRK_TYPE_READ;
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 7efe4bc3ccf63..ac5862cee142a 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -962,6 +962,7 @@ static void insert_cpu_bpts(void)
brk.address = dabr[i].address;
brk.type = (dabr[i].enabled & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL;
brk.len = 8;
+ brk.hw_len = 8;
__set_breakpoint(i, &brk);
}
}
--
2.25.1