Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Alexei Starovoitov says:

====================
pull-request: bpf 2019-05-09

The following pull-request contains BPF updates for your *net* tree.

The main changes are:

1) three small fixes from Gary, Jiong and Lorenz.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 19 insertions, 3 deletions

diff --git a/Documentation/bpf/btf.rst b/Documentation/bpf/btf.rst
index 29396e6943b0..8820360d00da 100644
--- a/Documentation/bpf/btf.rst
+++ b/Documentation/bpf/btf.rst
@@ -578,6 +578,7 @@ For line_info, the line number and column number are defined as below:
     #define BPF_LINE_INFO_LINE_COL(line_col)        ((line_col) & 0x3ff)
 
 3.4 BPF_{PROG,MAP}_GET_NEXT_ID
+==============================
 
 In kernel, every loaded program, map or btf has a unique id. The id won't
 change during the lifetime of a program, map, or btf.
@@ -587,6 +588,7 @@ each command, to user space, for bpf program or maps, respectively, so an
 inspection tool can inspect all programs and maps.
 
 3.5 BPF_{PROG,MAP}_GET_FD_BY_ID
+===============================
 
 An introspection tool cannot use id to get details about program or maps.
 A file descriptor needs to be obtained first for reference-counting purpose.
diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
index f272247d1708..d4bf0e694541 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
@@ -328,7 +328,18 @@ __emit_shf(struct nfp_prog *nfp_prog, u16 dst, enum alu_dst_ab dst_ab,
 		return;
 	}
 
-	if (sc == SHF_SC_L_SHF)
+	/* NFP shift instruction has something special. If shift direction is
+	 * left then shift amount of 1 to 31 is specified as 32 minus the amount
+	 * to shift.
+	 *
+	 * But no need to do this for indirect shift which has shift amount be
+	 * 0. Even after we do this subtraction, shift amount 0 will be turned
+	 * into 32 which will eventually be encoded the same as 0 because only
+	 * low 5 bits are encoded, but shift amount be 32 will fail the
+	 * FIELD_PREP check done later on shift mask (0x1f), due to 32 is out of
+	 * mask range.
+	 */
+	if (sc == SHF_SC_L_SHF && shift)
 		shift = 32 - shift;
 
 	insn = OP_SHF_BASE |
diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c b/tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c
index 23b159d95c3f..b74e2f6e96d0 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c
@@ -15,7 +15,7 @@ static int libbpf_debug_print(enum libbpf_print_level level,
 static int check_load(const char *file)
 {
 	struct bpf_prog_load_attr attr;
-	struct bpf_object *obj;
+	struct bpf_object *obj = NULL;
 	int err, prog_fd;
 
 	memset(&attr, 0, sizeof(struct bpf_prog_load_attr));
diff --git a/tools/testing/selftests/bpf/prog_tests/task_fd_query_tp.c b/tools/testing/selftests/bpf/prog_tests/task_fd_query_tp.c
index d636a4f39476..f9b70e81682b 100644
--- a/tools/testing/selftests/bpf/prog_tests/task_fd_query_tp.c
+++ b/tools/testing/selftests/bpf/prog_tests/task_fd_query_tp.c
@@ -9,7 +9,7 @@ static void test_task_fd_query_tp_core(const char *probe_name,
 	struct perf_event_attr attr = {};
 	__u64 probe_offset, probe_addr;
 	__u32 len, prog_id, fd_type;
-	struct bpf_object *obj;
+	struct bpf_object *obj = NULL;
 	__u32 duration = 0;
 	char buf[256];
 
diff --git a/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c b/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c
index a2f476f91637..fb095e5cd9af 100644
--- a/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c
+++ b/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c
@@ -13,6 +13,9 @@ void test_tp_attach_query(void)
 	struct bpf_prog_info prog_info;
 	char buf[256];
 
+	for (i = 0; i < num_progs; i++)
+		obj[i] = NULL;
+
 	snprintf(buf, sizeof(buf),
 		 "/sys/kernel/debug/tracing/events/sched/sched_switch/id");
 	efd = open(buf, O_RDONLY, 0);