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selftests/bpf: Fix a user_ringbuf failure with arm64 64KB page size

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[ Upstream commit bbc7bd658ddc662083639b9e9a280b90225ecd9a ]

The ringbuf max_entries must be PAGE_ALIGNED. See kernel function
ringbuf_map_alloc(). So for arm64 64KB page size, adjust max_entries
properly.

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20250607013626.1553001-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yonghong Song
2025-06-06 18:36:26 -07:00
committed by Greg Kroah-Hartman
parent c03a532fe1
commit d02ee5eebb
1 changed files with 7 additions and 3 deletions
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10
tools/testing/selftests/bpf/prog_tests/user_ringbuf.c
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@@ -21,8 +21,7 @@
#include "../progs/test_user_ringbuf.h"
static const long c_sample_size = sizeof(struct sample) + BPF_RINGBUF_HDR_SZ;
static const long c_ringbuf_size = 1 << 12; /* 1 small page */
static const long c_max_entries = c_ringbuf_size / c_sample_size;
static long c_ringbuf_size, c_max_entries;
static void drain_current_samples(void)
{
@@ -424,7 +423,9 @@ static void test_user_ringbuf_loop(void)
uint32_t remaining_samples = total_samples;
int err;
BUILD_BUG_ON(total_samples <= c_max_entries);
if (!ASSERT_LT(c_max_entries, total_samples, "compare_c_max_entries"))
return;
err = load_skel_create_user_ringbuf(&skel, &ringbuf);
if (err)
return;
@@ -686,6 +687,9 @@ void test_user_ringbuf(void)
{
int i;
c_ringbuf_size = getpagesize(); /* 1 page */
c_max_entries = c_ringbuf_size / c_sample_size;
for (i = 0; i < ARRAY_SIZE(success_tests); i++) {
if (!test__start_subtest(success_tests[i].test_name))
continue;