Commit 9ff86ca1 authored by Uladzislau Rezki (Sony)'s avatar Uladzislau Rezki (Sony) Committed by Andrew Morton
Browse files

lib/test_vmalloc: add no_block_alloc_test case 

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: default avatarUladzislau 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: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 11119b19

lib/test_vmalloc.c

+26 −0
Original line number Diff line number Diff line
@@ -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. */

};