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lib/test_vmalloc: add no_block_alloc_test case

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Patch series "__vmalloc()/kvmalloc() and no-block support", v4.


This patch (of 10):

Introduce a new test case "no_block_alloc_test" that verifies non-blocking
allocations using __vmalloc() with GFP_ATOMIC and GFP_NOWAIT flags.

It is recommended to build kernel with CONFIG_DEBUG_ATOMIC_SLEEP enabled
to help catch "sleeping while atomic" issues.  This test ensures that
memory allocation logic under atomic constraints does not inadvertently
sleep.

Link: https://lkml.kernel.org/r/20251007122035.56347-2-urezki@gmail.com
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Marco Elver <elver@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Uladzislau Rezki (Sony) 2025-10-07 14:20:26 +02:00 committed by Andrew Morton
parent 11119b19f6
commit 9ff86ca1cc
1 changed files with 26 additions and 0 deletions
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26
lib/test_vmalloc.c
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@ -54,6 +54,7 @@ __param(int, run_test_mask, 7,
"\t\tid: 256, name: kvfree_rcu_1_arg_vmalloc_test\n"
"\t\tid: 512, name: kvfree_rcu_2_arg_vmalloc_test\n"
"\t\tid: 1024, name: vm_map_ram_test\n"
"\t\tid: 2048, name: no_block_alloc_test\n"
/* Add a new test case description here. */
);
@ -283,6 +284,30 @@ static int fix_size_alloc_test(void)
return 0;
}
static int no_block_alloc_test(void)
{
void *ptr;
int i;
for (i = 0; i < test_loop_count; i++) {
bool use_atomic = !!(get_random_u8() % 2);
gfp_t gfp = use_atomic ? GFP_ATOMIC : GFP_NOWAIT;
unsigned long size = (nr_pages > 0 ? nr_pages : 1) * PAGE_SIZE;
preempt_disable();
ptr = __vmalloc(size, gfp);
preempt_enable();
if (!ptr)
return -1;
*((__u8 *)ptr) = 0;
vfree(ptr);
}
return 0;
}
static int
pcpu_alloc_test(void)
{
@ -411,6 +436,7 @@ static struct test_case_desc test_case_array[] = {
{ "kvfree_rcu_1_arg_vmalloc_test", kvfree_rcu_1_arg_vmalloc_test, },
{ "kvfree_rcu_2_arg_vmalloc_test", kvfree_rcu_2_arg_vmalloc_test, },
{ "vm_map_ram_test", vm_map_ram_test, },
{ "no_block_alloc_test", no_block_alloc_test, true },
/* Add a new test case here. */
};