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bpf: add constant pointer to helper-skb-ancestor-cgroup-id.c test

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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.
This commit is contained in:
Jose E. Marchesi 2024-01-27 20:08:12 +01:00
parent ce61de1b8a
commit f64448f4ff
1 changed files with 4 additions and 1 deletions
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5
gcc/testsuite/gcc.target/bpf/helper-skb-ancestor-cgroup-id.c
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@ -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" } } */