[PATCH bpf-next v2 0/3] bpf: fsession support for s390

[PATCH bpf-next v2 0/3] bpf: fsession support for s390

[Menglong Dong]

Implement bpf fsession for the s390 architecture.

Changes v2 -> v1:
* keep LGHI as it was in the 1st patch
* fix up the comment style
* remove the unnecessary checking of fentry->nr_links and fexit->nr_links
  in the 2nd patch
* v1: https://lore.kernel.org/bpf/20260223084022.653186-1-dongml2@chinatelecom.cn/

Menglong Dong (3):
  bpf,s390: introduce emit_store_stack_imm64() for trampoline
  bpf,s390: add fsession support for trampolines
  selftests/bpf: factor out get_func_* tests for fsession

 arch/s390/net/bpf_jit_comp.c                  | 95 ++++++++++++++-----
 .../bpf/prog_tests/get_func_args_test.c       | 25 ++++-
 .../bpf/prog_tests/get_func_ip_test.c         | 28 +++++-
 .../bpf/progs/get_func_args_fsession_test.c   | 37 ++++++++
 .../selftests/bpf/progs/get_func_args_test.c  | 38 --------
 .../bpf/progs/get_func_ip_fsession_test.c     | 21 ++++
 .../selftests/bpf/progs/get_func_ip_test.c    | 23 -----
 7 files changed, 178 insertions(+), 89 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/progs/get_func_args_fsession_test.c
 create mode 100644 tools/testing/selftests/bpf/progs/get_func_ip_fsession_test.c

-- 
2.53.0

[PATCH bpf-next v2 1/3] bpf,s390: introduce emit_store_stack_imm64() for trampoline

[Menglong Dong]

Introduce a helper to store 64-bit immediate on the trampoline stack with
a help of a register.

Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
v2:
- keep LGHI as it was
---
 arch/s390/net/bpf_jit_comp.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index 579461d471bb..76c80d75184f 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -2506,6 +2506,13 @@ static void load_imm64(struct bpf_jit *jit, int dst_reg, u64 val)
 	EMIT6_IMM(0xc00d0000, dst_reg, val);
 }
 
+static void emit_store_stack_imm64(struct bpf_jit *jit, int tmp_reg, int stack_off, u64 imm)
+{
+	load_imm64(jit, tmp_reg, imm);
+	/* stg %tmp_reg,stack_off(%r15) */
+	EMIT6_DISP_LH(0xe3000000, 0x0024, tmp_reg, REG_0, REG_15, stack_off);
+}
+
 static int invoke_bpf_prog(struct bpf_tramp_jit *tjit,
 			   const struct btf_func_model *m,
 			   struct bpf_tramp_link *tlink, bool save_ret)
@@ -2520,10 +2527,7 @@ static int invoke_bpf_prog(struct bpf_tramp_jit *tjit,
 	 * run_ctx.cookie = tlink->cookie;
 	 */
 
-	/* %r0 = tlink->cookie */
-	load_imm64(jit, REG_W0, tlink->cookie);
-	/* stg %r0,cookie_off(%r15) */
-	EMIT6_DISP_LH(0xe3000000, 0x0024, REG_W0, REG_0, REG_15, cookie_off);
+	emit_store_stack_imm64(jit, REG_W0, cookie_off, tlink->cookie);
 
 	/*
 	 * if ((start = __bpf_prog_enter(p, &run_ctx)) == 0)
@@ -2743,13 +2747,8 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 	 * arg_cnt = m->nr_args;
 	 */
 
-	if (flags & BPF_TRAMP_F_IP_ARG) {
-		/* %r0 = func_addr */
-		load_imm64(jit, REG_0, (u64)func_addr);
-		/* stg %r0,ip_off(%r15) */
-		EMIT6_DISP_LH(0xe3000000, 0x0024, REG_0, REG_0, REG_15,
-			      tjit->ip_off);
-	}
+	if (flags & BPF_TRAMP_F_IP_ARG)
+		emit_store_stack_imm64(jit, REG_0, tjit->ip_off, (u64)func_addr);
 	/* lghi %r0,nr_bpf_args */
 	EMIT4_IMM(0xa7090000, REG_0, nr_bpf_args);
 	/* stg %r0,arg_cnt_off(%r15) */
-- 
2.53.0

[PATCH bpf-next v2 2/3] bpf,s390: add fsession support for trampolines

[Menglong Dong]

Implement BPF_TRACE_FSESSION support for s390. The logic here is similar
to what we did in x86_64.

In order to simply the logic, we factor out the function invoke_bpf() for
fentry and fexit.

Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
---
v2:
- fix up the comment style
- remove the unnecessary checking of fentry->nr_links and fexit->nr_links
---
 arch/s390/net/bpf_jit_comp.c | 74 +++++++++++++++++++++++++++++-------
 1 file changed, 60 insertions(+), 14 deletions(-)

diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index 76c80d75184f..2db32bb04246 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -2480,8 +2480,8 @@ struct bpf_tramp_jit {
 	int ip_off;		/* For bpf_get_func_ip(), has to be at
 				 * (ctx - 16)
 				 */
-	int arg_cnt_off;	/* For bpf_get_func_arg_cnt(), has to be at
-				 * (ctx - 8)
+	int func_meta_off;	/* For bpf_get_func_arg_cnt()/fsession, has
+				 * to be at (ctx - 8)
 				 */
 	int bpf_args_off;	/* Offset of BPF_PROG context, which consists
 				 * of BPF arguments followed by return value
@@ -2585,6 +2585,28 @@ static int invoke_bpf_prog(struct bpf_tramp_jit *tjit,
 	return 0;
 }
 
+static int invoke_bpf(struct bpf_tramp_jit *tjit,
+		      const struct btf_func_model *m,
+		      struct bpf_tramp_links *tl, bool save_ret,
+		      u64 func_meta, int cookie_off)
+{
+	int i, cur_cookie = (tjit->bpf_args_off - cookie_off) / sizeof(u64);
+	struct bpf_jit *jit = &tjit->common;
+
+	for (i = 0; i < tl->nr_links; i++) {
+		if (bpf_prog_calls_session_cookie(tl->links[i])) {
+			u64 meta = func_meta | ((u64)cur_cookie << BPF_TRAMP_COOKIE_INDEX_SHIFT);
+
+			emit_store_stack_imm64(jit, REG_0, tjit->func_meta_off, meta);
+			cur_cookie--;
+		}
+		if (invoke_bpf_prog(tjit, m, tl->links[i], save_ret))
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int alloc_stack(struct bpf_tramp_jit *tjit, size_t size)
 {
 	int stack_offset = tjit->stack_size;
@@ -2614,8 +2636,10 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 	struct bpf_tramp_links *fentry = &tlinks[BPF_TRAMP_FENTRY];
 	struct bpf_tramp_links *fexit = &tlinks[BPF_TRAMP_FEXIT];
 	int nr_bpf_args, nr_reg_args, nr_stack_args;
+	int cookie_cnt, cookie_off, fsession_cnt;
 	struct bpf_jit *jit = &tjit->common;
 	int arg, bpf_arg_off;
+	u64 func_meta;
 	int i, j;
 
 	/* Support as many stack arguments as "mvc" instruction can handle. */
@@ -2647,6 +2671,9 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 			return -ENOTSUPP;
 	}
 
+	cookie_cnt = bpf_fsession_cookie_cnt(tlinks);
+	fsession_cnt = bpf_fsession_cnt(tlinks);
+
 	/*
 	 * Calculate the stack layout.
 	 */
@@ -2659,8 +2686,9 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 	tjit->backchain_off = tjit->stack_size - sizeof(u64);
 	tjit->stack_args_off = alloc_stack(tjit, nr_stack_args * sizeof(u64));
 	tjit->reg_args_off = alloc_stack(tjit, nr_reg_args * sizeof(u64));
+	cookie_off = alloc_stack(tjit, cookie_cnt * sizeof(u64));
 	tjit->ip_off = alloc_stack(tjit, sizeof(u64));
-	tjit->arg_cnt_off = alloc_stack(tjit, sizeof(u64));
+	tjit->func_meta_off = alloc_stack(tjit, sizeof(u64));
 	tjit->bpf_args_off = alloc_stack(tjit, nr_bpf_args * sizeof(u64));
 	tjit->retval_off = alloc_stack(tjit, sizeof(u64));
 	tjit->r7_r8_off = alloc_stack(tjit, 2 * sizeof(u64));
@@ -2749,11 +2777,12 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 
 	if (flags & BPF_TRAMP_F_IP_ARG)
 		emit_store_stack_imm64(jit, REG_0, tjit->ip_off, (u64)func_addr);
-	/* lghi %r0,nr_bpf_args */
-	EMIT4_IMM(0xa7090000, REG_0, nr_bpf_args);
-	/* stg %r0,arg_cnt_off(%r15) */
+	func_meta = nr_bpf_args;
+	/* lghi %r0,func_meta */
+	EMIT4_IMM(0xa7090000, REG_0, func_meta);
+	/* stg %r0,func_meta_off(%r15) */
 	EMIT6_DISP_LH(0xe3000000, 0x0024, REG_0, REG_0, REG_15,
-		      tjit->arg_cnt_off);
+		      tjit->func_meta_off);
 
 	if (flags & BPF_TRAMP_F_CALL_ORIG) {
 		/*
@@ -2766,10 +2795,17 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 		EMIT6_PCREL_RILB_PTR(0xc0050000, REG_14, __bpf_tramp_enter);
 	}
 
-	for (i = 0; i < fentry->nr_links; i++)
-		if (invoke_bpf_prog(tjit, m, fentry->links[i],
-				    flags & BPF_TRAMP_F_RET_FENTRY_RET))
-			return -EINVAL;
+	if (fsession_cnt) {
+		/* Clear all the session cookies' value. */
+		for (i = 0; i < cookie_cnt; i++)
+			emit_store_stack_imm64(jit, REG_0, cookie_off + 8 * i, 0);
+		/* Clear the return value to make sure fentry always gets 0. */
+		emit_store_stack_imm64(jit, REG_0, tjit->retval_off, 0);
+	}
+
+	if (invoke_bpf(tjit, m, fentry, flags & BPF_TRAMP_F_RET_FENTRY_RET,
+		       func_meta, cookie_off))
+		return -EINVAL;
 
 	if (fmod_ret->nr_links) {
 		/*
@@ -2846,11 +2882,16 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 		EMIT6_PCREL_RILC(0xc0040000, 0, (u64)im->ip_epilogue);
 	}
 
+	/* Set the "is_return" flag for fsession. */
+	func_meta |= (1ULL << BPF_TRAMP_IS_RETURN_SHIFT);
+	if (fsession_cnt)
+		emit_store_stack_imm64(jit, REG_W0, tjit->func_meta_off,
+				       func_meta);
+
 	/* do_fexit: */
 	tjit->do_fexit = jit->prg;
-	for (i = 0; i < fexit->nr_links; i++)
-		if (invoke_bpf_prog(tjit, m, fexit->links[i], false))
-			return -EINVAL;
+	if (invoke_bpf(tjit, m, fexit, false, func_meta, cookie_off))
+		return -EINVAL;
 
 	if (flags & BPF_TRAMP_F_CALL_ORIG) {
 		im->ip_epilogue = jit->prg_buf + jit->prg;
@@ -2955,6 +2996,11 @@ bool bpf_jit_supports_arena(void)
 	return true;
 }
 
+bool bpf_jit_supports_fsession(void)
+{
+	return true;
+}
+
 bool bpf_jit_supports_insn(struct bpf_insn *insn, bool in_arena)
 {
 	if (!in_arena)
-- 
2.53.0

[PATCH bpf-next v2 3/3] selftests/bpf: factor out get_func_* tests for fsession

[Menglong Dong]

The fsession is already supported by x86_64, arm64, riscv and s390, so we
don't need to disable it in the compile time according to the
architecture. Factor out the testings for it. Therefore, the testing can
be disabled for the architecture that doesn't support it manually.

Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 .../bpf/prog_tests/get_func_args_test.c       | 25 +++++++++++-
 .../bpf/prog_tests/get_func_ip_test.c         | 28 +++++++++++++-
 .../bpf/progs/get_func_args_fsession_test.c   | 37 ++++++++++++++++++
 .../selftests/bpf/progs/get_func_args_test.c  | 38 -------------------
 .../bpf/progs/get_func_ip_fsession_test.c     | 21 ++++++++++
 .../selftests/bpf/progs/get_func_ip_test.c    | 23 -----------
 6 files changed, 108 insertions(+), 64 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/progs/get_func_args_fsession_test.c
 create mode 100644 tools/testing/selftests/bpf/progs/get_func_ip_fsession_test.c

diff --git a/tools/testing/selftests/bpf/prog_tests/get_func_args_test.c b/tools/testing/selftests/bpf/prog_tests/get_func_args_test.c
index 96b27de05524..7bf8adc41e99 100644
--- a/tools/testing/selftests/bpf/prog_tests/get_func_args_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/get_func_args_test.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <test_progs.h>
 #include "get_func_args_test.skel.h"
+#include "get_func_args_fsession_test.skel.h"
 
 void test_get_func_args_test(void)
 {
@@ -41,8 +42,30 @@ void test_get_func_args_test(void)
 	ASSERT_EQ(skel->bss->test4_result, 1, "test4_result");
 	ASSERT_EQ(skel->bss->test5_result, 1, "test5_result");
 	ASSERT_EQ(skel->bss->test6_result, 1, "test6_result");
-	ASSERT_EQ(skel->bss->test7_result, 1, "test7_result");
 
 cleanup:
 	get_func_args_test__destroy(skel);
 }
+
+void test_get_func_args_fsession_test(void)
+{
+	struct get_func_args_fsession_test *skel = NULL;
+	int err;
+	LIBBPF_OPTS(bpf_test_run_opts, topts);
+
+	skel = get_func_args_fsession_test__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "get_func_args_fsession_test__open_and_load"))
+		return;
+
+	err = get_func_args_fsession_test__attach(skel);
+	if (!ASSERT_OK(err, "get_func_args_fsession_test__attach"))
+		goto cleanup;
+
+	err = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test1), &topts);
+	ASSERT_OK(err, "test_run");
+	ASSERT_EQ(topts.retval, 0, "test_run");
+
+	ASSERT_EQ(skel->bss->test1_result, 1, "test1_result");
+cleanup:
+	get_func_args_fsession_test__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c b/tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c
index 7772a0f288d3..357fdedfea93 100644
--- a/tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c
@@ -2,6 +2,7 @@
 #include <test_progs.h>
 #include "get_func_ip_test.skel.h"
 #include "get_func_ip_uprobe_test.skel.h"
+#include "get_func_ip_fsession_test.skel.h"
 
 static noinline void uprobe_trigger(void)
 {
@@ -46,8 +47,6 @@ static void test_function_entry(void)
 	ASSERT_EQ(skel->bss->test5_result, 1, "test5_result");
 	ASSERT_EQ(skel->bss->test7_result, 1, "test7_result");
 	ASSERT_EQ(skel->bss->test8_result, 1, "test8_result");
-	ASSERT_EQ(skel->bss->test9_entry_result, 1, "test9_entry_result");
-	ASSERT_EQ(skel->bss->test9_exit_result, 1, "test9_exit_result");
 
 cleanup:
 	get_func_ip_test__destroy(skel);
@@ -139,3 +138,28 @@ void test_get_func_ip_test(void)
 	test_function_entry();
 	test_function_body();
 }
+
+void test_get_func_ip_fsession_test(void)
+{
+	struct get_func_ip_fsession_test *skel = NULL;
+	int err;
+	LIBBPF_OPTS(bpf_test_run_opts, topts);
+
+	skel = get_func_ip_fsession_test__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "get_func_ip_fsession_test__open_and_load"))
+		return;
+
+	err = get_func_ip_fsession_test__attach(skel);
+	if (!ASSERT_OK(err, "get_func_ip_fsession_test__attach"))
+		goto cleanup;
+
+	err = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test1), &topts);
+	ASSERT_OK(err, "test_run");
+	ASSERT_EQ(topts.retval, 0, "test_run");
+
+	ASSERT_EQ(skel->bss->test1_entry_result, 1, "test1_entry_result");
+	ASSERT_EQ(skel->bss->test1_exit_result, 1, "test1_exit_result");
+
+cleanup:
+	get_func_ip_fsession_test__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/get_func_args_fsession_test.c b/tools/testing/selftests/bpf/progs/get_func_args_fsession_test.c
new file mode 100644
index 000000000000..bb597f24b659
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/get_func_args_fsession_test.c
@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include <errno.h>
+
+char _license[] SEC("license") = "GPL";
+
+__u64 test1_result = 0;
+
+SEC("fsession/bpf_fentry_test1")
+int BPF_PROG(test1)
+{
+	__u64 cnt = bpf_get_func_arg_cnt(ctx);
+	__u64 a = 0, z = 0, ret = 0;
+	__s64 err;
+
+	test1_result = cnt == 1;
+
+	/* valid arguments */
+	err = bpf_get_func_arg(ctx, 0, &a);
+	test1_result &= err == 0 && ((int) a == 1);
+
+	/* not valid argument */
+	err = bpf_get_func_arg(ctx, 1, &z);
+	test1_result &= err == -EINVAL;
+
+	if (bpf_session_is_return(ctx)) {
+		err = bpf_get_func_ret(ctx, &ret);
+		test1_result &= err == 0 && ret == 2;
+	} else {
+		err = bpf_get_func_ret(ctx, &ret);
+		test1_result &= err == 0 && ret == 0;
+	}
+
+	return 0;
+}
diff --git a/tools/testing/selftests/bpf/progs/get_func_args_test.c b/tools/testing/selftests/bpf/progs/get_func_args_test.c
index 075a1180ec26..1bf47f64d096 100644
--- a/tools/testing/selftests/bpf/progs/get_func_args_test.c
+++ b/tools/testing/selftests/bpf/progs/get_func_args_test.c
@@ -165,41 +165,3 @@ int BPF_PROG(tp_test2)
 
 	return 0;
 }
-
-__u64 test7_result = 0;
-#if defined(bpf_target_x86) || defined(bpf_target_arm64) || defined(bpf_target_riscv)
-SEC("fsession/bpf_fentry_test1")
-int BPF_PROG(test7)
-{
-	__u64 cnt = bpf_get_func_arg_cnt(ctx);
-	__u64 a = 0, z = 0, ret = 0;
-	__s64 err;
-
-	test7_result = cnt == 1;
-
-	/* valid arguments */
-	err = bpf_get_func_arg(ctx, 0, &a);
-	test7_result &= err == 0 && ((int) a == 1);
-
-	/* not valid argument */
-	err = bpf_get_func_arg(ctx, 1, &z);
-	test7_result &= err == -EINVAL;
-
-	if (bpf_session_is_return(ctx)) {
-		err = bpf_get_func_ret(ctx, &ret);
-		test7_result &= err == 0 && ret == 2;
-	} else {
-		err = bpf_get_func_ret(ctx, &ret);
-		test7_result &= err == 0 && ret == 0;
-	}
-
-	return 0;
-}
-#else
-SEC("fentry/bpf_fentry_test1")
-int BPF_PROG(test7)
-{
-	test7_result = 1;
-	return 0;
-}
-#endif
diff --git a/tools/testing/selftests/bpf/progs/get_func_ip_fsession_test.c b/tools/testing/selftests/bpf/progs/get_func_ip_fsession_test.c
new file mode 100644
index 000000000000..bbeea0d512e3
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/get_func_ip_fsession_test.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+
+__u64 test1_entry_result = 0;
+__u64 test1_exit_result = 0;
+
+SEC("fsession/bpf_fentry_test1")
+int BPF_PROG(test1, int a)
+{
+	__u64 addr = bpf_get_func_ip(ctx);
+
+	if (bpf_session_is_return(ctx))
+		test1_exit_result = (const void *) addr == &bpf_fentry_test1;
+	else
+		test1_entry_result = (const void *) addr == &bpf_fentry_test1;
+	return 0;
+}
diff --git a/tools/testing/selftests/bpf/progs/get_func_ip_test.c b/tools/testing/selftests/bpf/progs/get_func_ip_test.c
index 45eaa54d1ac7..2011cacdeb18 100644
--- a/tools/testing/selftests/bpf/progs/get_func_ip_test.c
+++ b/tools/testing/selftests/bpf/progs/get_func_ip_test.c
@@ -103,26 +103,3 @@ int BPF_URETPROBE(test8, int ret)
 	test8_result = (const void *) addr == (const void *) uprobe_trigger;
 	return 0;
 }
-
-__u64 test9_entry_result = 0;
-__u64 test9_exit_result = 0;
-#if defined(bpf_target_x86) || defined(bpf_target_arm64) || defined(bpf_target_riscv)
-SEC("fsession/bpf_fentry_test1")
-int BPF_PROG(test9, int a)
-{
-	__u64 addr = bpf_get_func_ip(ctx);
-
-	if (bpf_session_is_return(ctx))
-		test9_exit_result = (const void *) addr == &bpf_fentry_test1;
-	else
-		test9_entry_result = (const void *) addr == &bpf_fentry_test1;
-	return 0;
-}
-#else
-SEC("fentry/bpf_fentry_test1")
-int BPF_PROG(test9, int a)
-{
-	test9_entry_result = test9_exit_result = 1;
-	return 0;
-}
-#endif
-- 
2.53.0

Re: [PATCH bpf-next v2 0/3] bpf: fsession support for s390

[patchwork-bot+netdevbpf]

Hello:

This series was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Tue, 24 Feb 2026 17:22:05 +0800 you wrote:
> Implement bpf fsession for the s390 architecture.
> 
> Changes v2 -> v1:
> * keep LGHI as it was in the 1st patch
> * fix up the comment style
> * remove the unnecessary checking of fentry->nr_links and fexit->nr_links
>   in the 2nd patch
> * v1: https://lore.kernel.org/bpf/20260223084022.653186-1-dongml2@chinatelecom.cn/
> 
> [...]

Here is the summary with links:
  - [bpf-next,v2,1/3] bpf,s390: introduce emit_store_stack_imm64() for trampoline
    https://git.kernel.org/bpf/bpf-next/c/339193c44e75
  - [bpf-next,v2,2/3] bpf,s390: add fsession support for trampolines
    https://git.kernel.org/bpf/bpf-next/c/63d2b7d10126
  - [bpf-next,v2,3/3] selftests/bpf: factor out get_func_* tests for fsession
    https://git.kernel.org/bpf/bpf-next/c/c1eee8d1e84f

You are awesome, thank you!
-- 
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