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Message-Id: <20230412164345.328659-1-peterx@redhat.com>
Date: Wed, 12 Apr 2023 12:43:45 -0400
From: Peter Xu <peterx@...hat.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc: David Hildenbrand <david@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Leonardo Bras Soares Passos <lsoaresp@...hat.com>,
peterx@...hat.com, Andrea Arcangeli <aarcange@...hat.com>,
Nadav Amit <nadav.amit@...il.com>,
Mike Rapoport <rppt@...ux.vnet.ibm.com>,
Axel Rasmussen <axelrasmussen@...gle.com>,
Mike Kravetz <mike.kravetz@...cle.com>
Subject: [PATCH v2 21/31] selftests/mm: Allow allocate_area() to fail properly
Mostly to detect hugetlb allocation errors and skip hugetlb tests when
pages are not allocated.
Signed-off-by: Peter Xu <peterx@...hat.com>
---
tools/testing/selftests/mm/uffd-common.c | 47 +++++++++++++++++-------
tools/testing/selftests/mm/uffd-common.h | 4 +-
2 files changed, 36 insertions(+), 15 deletions(-)
diff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selftests/mm/uffd-common.c
index daa2a95408e6..bc6c5c38d6dd 100644
--- a/tools/testing/selftests/mm/uffd-common.c
+++ b/tools/testing/selftests/mm/uffd-common.c
@@ -44,10 +44,15 @@ static void anon_release_pages(char *rel_area)
err("madvise(MADV_DONTNEED) failed");
}
-static void anon_allocate_area(void **alloc_area, bool is_src)
+static int anon_allocate_area(void **alloc_area, bool is_src)
{
*alloc_area = mmap(NULL, nr_pages * page_size, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+ if (*alloc_area == MAP_FAILED) {
+ *alloc_area = NULL;
+ return -errno;
+ }
+ return 0;
}
static void noop_alias_mapping(__u64 *start, size_t len, unsigned long offset)
@@ -65,7 +70,7 @@ static void hugetlb_release_pages(char *rel_area)
}
}
-static void hugetlb_allocate_area(void **alloc_area, bool is_src)
+static int hugetlb_allocate_area(void **alloc_area, bool is_src)
{
off_t size = nr_pages * page_size;
off_t offset = is_src ? 0 : size;
@@ -77,14 +82,16 @@ static void hugetlb_allocate_area(void **alloc_area, bool is_src)
(map_shared ? MAP_SHARED : MAP_PRIVATE) |
(is_src ? 0 : MAP_NORESERVE),
mem_fd, offset);
- if (*alloc_area == MAP_FAILED)
- err("mmap of hugetlbfs file failed");
+ if (*alloc_area == MAP_FAILED) {
+ *alloc_area = NULL;
+ return -errno;
+ }
if (map_shared) {
area_alias = mmap(NULL, size, PROT_READ | PROT_WRITE,
MAP_SHARED, mem_fd, offset);
if (area_alias == MAP_FAILED)
- err("mmap of hugetlb file alias failed");
+ return -errno;
}
if (is_src) {
@@ -96,6 +103,7 @@ static void hugetlb_allocate_area(void **alloc_area, bool is_src)
*alloc_area_alias = area_alias;
close(mem_fd);
+ return 0;
}
static void hugetlb_alias_mapping(__u64 *start, size_t len, unsigned long offset)
@@ -112,7 +120,7 @@ static void shmem_release_pages(char *rel_area)
err("madvise(MADV_REMOVE) failed");
}
-static void shmem_allocate_area(void **alloc_area, bool is_src)
+static int shmem_allocate_area(void **alloc_area, bool is_src)
{
void *area_alias = NULL;
size_t bytes = nr_pages * page_size, hpage_size = read_pmd_pagesize();
@@ -132,15 +140,20 @@ static void shmem_allocate_area(void **alloc_area, bool is_src)
*alloc_area = mmap(p, bytes, PROT_READ | PROT_WRITE, MAP_SHARED,
mem_fd, offset);
- if (*alloc_area == MAP_FAILED)
- err("mmap of memfd failed");
+ if (*alloc_area == MAP_FAILED) {
+ *alloc_area = NULL;
+ return -errno;
+ }
if (test_collapse && *alloc_area != p)
err("mmap of memfd failed at %p", p);
area_alias = mmap(p_alias, bytes, PROT_READ | PROT_WRITE, MAP_SHARED,
mem_fd, offset);
- if (area_alias == MAP_FAILED)
- err("mmap of memfd alias failed");
+ if (area_alias == MAP_FAILED) {
+ munmap(*alloc_area, bytes);
+ *alloc_area = NULL;
+ return -errno;
+ }
if (test_collapse && area_alias != p_alias)
err("mmap of anonymous memory failed at %p", p_alias);
@@ -150,6 +163,7 @@ static void shmem_allocate_area(void **alloc_area, bool is_src)
area_dst_alias = area_alias;
close(mem_fd);
+ return 0;
}
static void shmem_alias_mapping(__u64 *start, size_t len, unsigned long offset)
@@ -282,14 +296,19 @@ static void uffd_test_ctx_clear(void)
munmap_area((void **)&area_remap);
}
-void uffd_test_ctx_init(uint64_t features)
+int uffd_test_ctx_init(uint64_t features)
{
unsigned long nr, cpu;
+ int ret;
uffd_test_ctx_clear();
- uffd_test_ops->allocate_area((void **)&area_src, true);
- uffd_test_ops->allocate_area((void **)&area_dst, false);
+ ret = uffd_test_ops->allocate_area((void **)&area_src, true);
+ if (ret)
+ return ret;
+ ret = uffd_test_ops->allocate_area((void **)&area_dst, false);
+ if (ret)
+ return ret;
userfaultfd_open(&features);
@@ -337,6 +356,8 @@ void uffd_test_ctx_init(uint64_t features)
for (cpu = 0; cpu < nr_cpus; cpu++)
if (pipe2(&pipefd[cpu * 2], O_CLOEXEC | O_NONBLOCK))
err("pipe");
+
+ return 0;
}
void wp_range(int ufd, __u64 start, __u64 len, bool wp)
diff --git a/tools/testing/selftests/mm/uffd-common.h b/tools/testing/selftests/mm/uffd-common.h
index 0ec07d025cfe..9479a0649d7f 100644
--- a/tools/testing/selftests/mm/uffd-common.h
+++ b/tools/testing/selftests/mm/uffd-common.h
@@ -80,7 +80,7 @@ struct uffd_args {
};
struct uffd_test_ops {
- void (*allocate_area)(void **alloc_area, bool is_src);
+ int (*allocate_area)(void **alloc_area, bool is_src);
void (*release_pages)(char *rel_area);
void (*alias_mapping)(__u64 *start, size_t len, unsigned long offset);
void (*check_pmd_mapping)(void *p, int expect_nr_hpages);
@@ -101,7 +101,7 @@ extern uffd_test_ops_t hugetlb_uffd_test_ops;
extern uffd_test_ops_t *uffd_test_ops;
void uffd_stats_report(struct uffd_args *args, int n_cpus);
-void uffd_test_ctx_init(uint64_t features);
+int uffd_test_ctx_init(uint64_t features);
void userfaultfd_open(uint64_t *features);
int uffd_read_msg(int ufd, struct uffd_msg *msg);
void wp_range(int ufd, __u64 start, __u64 len, bool wp);
--
2.39.1
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