[PATCH v6 08/16] powerpc/watchpoint: Disable all available watchpoints when !dawr_force_enable

From: Ravi Bangoria
Date: Thu May 14 2020 - 07:18:50 EST


Instead of disabling only first watchpoint, disable all available
watchpoints while clearing dawr_force_enable.

Callback function is used only for disabling watchpoint, rename it
to disable_dawrs_cb(). And null_brk parameter is not really required
while disabling watchpoint, remove it.

Signed-off-by: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxx>
Reviewed-by: Michael Neuling <mikey@xxxxxxxxxxx>
---
arch/powerpc/kernel/dawr.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/dawr.c b/arch/powerpc/kernel/dawr.c
index 8114ad3a8574..500f52fa4711 100644
--- a/arch/powerpc/kernel/dawr.c
+++ b/arch/powerpc/kernel/dawr.c
@@ -50,9 +50,13 @@ int set_dawr(int nr, struct arch_hw_breakpoint *brk)
return 0;
}

-static void set_dawr_cb(void *info)
+static void disable_dawrs_cb(void *info)
{
- set_dawr(0, info);
+ struct arch_hw_breakpoint null_brk = {0};
+ int i;
+
+ for (i = 0; i < nr_wp_slots(); i++)
+ set_dawr(i, &null_brk);
}

static ssize_t dawr_write_file_bool(struct file *file,
@@ -74,7 +78,7 @@ static ssize_t dawr_write_file_bool(struct file *file,

/* If we are clearing, make sure all CPUs have the DAWR cleared */
if (!dawr_force_enable)
- smp_call_function(set_dawr_cb, &null_brk, 0);
+ smp_call_function(disable_dawrs_cb, NULL, 0);

return rc;
}
--
2.26.2