* [COMMITTED] bpf: add constant pointer to helper-skb-ancestor-cgroup-id.c test
@ 2024-01-27 19:11 Jose E. Marchesi
0 siblings, 0 replies; only message in thread
From: Jose E. Marchesi @ 2024-01-27 19:11 UTC (permalink / raw)
To: gcc-patches
The purpose of this test is to make sure that constant propagation is
achieved with the proper optimization level, so a BPF call instruction
to a kernel helper is generated. This patch updates the patch so it
also covers kernel helpers defined with constant static pointers.
The motivation for this patch is:
https://lore.kernel.org/bpf/20240127185031.29854-1-jose.marchesi@oracle.com/T/#u
Tested in bpf-unknown-none target x86_64-linux-gnu host.
gcc/testsuite/ChangeLog
* gcc.target/bpf/helper-skb-ancestor-cgroup-id.c: Add constant
version of kernel helper static pointer.
---
gcc/testsuite/gcc.target/bpf/helper-skb-ancestor-cgroup-id.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/gcc/testsuite/gcc.target/bpf/helper-skb-ancestor-cgroup-id.c b/gcc/testsuite/gcc.target/bpf/helper-skb-ancestor-cgroup-id.c
index 693f390b9bb..075dbe6f852 100644
--- a/gcc/testsuite/gcc.target/bpf/helper-skb-ancestor-cgroup-id.c
+++ b/gcc/testsuite/gcc.target/bpf/helper-skb-ancestor-cgroup-id.c
@@ -5,6 +5,7 @@
struct __sk_buff;
static uint64_t (*bpf_skb_ancestor_cgroup_id)(struct __sk_buff *skb, int ancestor_level) = (void *) 83;
+static uint64_t (* const const_bpf_skb_ancestor_cgroup_id)(struct __sk_buff *skb, int ancestor_level) = (void *) 84;
void
foo ()
@@ -13,7 +14,9 @@ foo ()
void *skb;
int ancestor_level;
- ret = bpf_skb_ancestor_cgroup_id (skb, ancestor_level);
+ ret = bpf_skb_ancestor_cgroup_id (skb, ancestor_level)
+ + const_bpf_skb_ancestor_cgroup_id (skb, ancestor_level);
}
/* { dg-final { scan-assembler "call\t83" } } */
+/* { dg-final { scan-assembler "call\t84" } } */
--
2.30.2
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2024-01-27 19:11 [COMMITTED] bpf: add constant pointer to helper-skb-ancestor-cgroup-id.c test Jose E. Marchesi
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