selftests/bpf: Test rhtab kptr cancellation semanticsgrafted

Resizable hash-map updates and deletions must not perform full special-field
destruction in their caller context. In particular, a referenced kptr must
remain attached to the allocation until the memory allocator destructor can
release it safely.

Add separate coverage for both affected paths. The update test stores a task
kptr, replaces the ordinary value bytes with BPF_EXIST, and verifies that the
kptr survived. The delete test removes an element and exchanges its kptr
through the still-valid map-value pointer before the allocation is reclaimed.

Both cases observe a NULL kptr when rhtab uses bpf_obj_free_fields(). They
recover and release the reference after rhtab switches to cancellation
semantics.

Signed-off-by: Nuoqi Gui <gnq25@mails.tsinghua.edu.cn>
[ kkd: Split update and delete coverage and rewrote the commit log ]
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260904104203.345917-5-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/soc/starfive/reset-starfive-jh71x0.h b/include/soc/starfive/reset-starfive-jh71x0.h
new file mode 100644
index 000000000..47b486ece
--- /dev/null
+++ b/include/soc/starfive/reset-starfive-jh71x0.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __SOC_STARFIVE_RESET_JH71X0_H
+#define __SOC_STARFIVE_RESET_JH71X0_H
+
+#include <linux/auxiliary_bus.h>
+#include <linux/compiler_types.h>
+#include <linux/container_of.h>
+
+struct jh71x0_reset_adev {
+	void __iomem *base;
+	struct auxiliary_device adev;
+};
+
+#define to_jh71x0_reset_adev(_adev) \
+	container_of((_adev), struct jh71x0_reset_adev, adev)
+
+#endif