This is a note to let you know that I've just added the patch titled
powerpc/watchpoints: Annotate atomic context in more places
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-watchpoints-annotate-atomic-context-in-more-.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 639758871e79ad4749291e976f7a08e639f7949f
Author: Benjamin Gray <bgray@xxxxxxxxxxxxx>
Date: Tue Aug 29 16:34:57 2023 +1000
powerpc/watchpoints: Annotate atomic context in more places
[ Upstream commit 27646b2e02b096a6936b3e3b6ba334ae20763eab ]
It can be easy to miss that the notifier mechanism invokes the callbacks
in an atomic context, so add some comments to that effect on the two
handlers we register here.
Signed-off-by: Benjamin Gray <bgray@xxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://msgid.link/20230829063457.54157-4-bgray@xxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c
index 63fec0602af22..affb03f56a7e1 100644
--- a/arch/powerpc/kernel/hw_breakpoint.c
+++ b/arch/powerpc/kernel/hw_breakpoint.c
@@ -610,6 +610,11 @@ static void handle_p10dd1_spurious_exception(struct arch_hw_breakpoint **info,
}
}
+/*
+ * Handle a DABR or DAWR exception.
+ *
+ * Called in atomic context.
+ */
int hw_breakpoint_handler(struct die_args *args)
{
bool err = false;
@@ -736,6 +741,8 @@ NOKPROBE_SYMBOL(hw_breakpoint_handler);
/*
* Handle single-step exceptions following a DABR hit.
+ *
+ * Called in atomic context.
*/
static int single_step_dabr_instruction(struct die_args *args)
{
@@ -793,6 +800,8 @@ NOKPROBE_SYMBOL(single_step_dabr_instruction);
/*
* Handle debug exception notifications.
+ *
+ * Called in atomic context.
*/
int hw_breakpoint_exceptions_notify(
struct notifier_block *unused, unsigned long val, void *data)
