mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 12:28:41 +08:00
582eb3aeed
We mix up KUNIT_TRIGGER_STATIC_STUB and KUNIT_STATIC_STUB_REDIRECT in static_stub header. Just correct KUNIT_TRIGGER_STATIC_STUB to KUNIT_STATIC_STUB_REDIRECT which is documented. Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com> Reviewed-by: David Gow <davidgow@google.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
114 lines
3.6 KiB
C
114 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* KUnit function redirection (static stubbing) API.
|
|
*
|
|
* Copyright (C) 2022, Google LLC.
|
|
* Author: David Gow <davidgow@google.com>
|
|
*/
|
|
#ifndef _KUNIT_STATIC_STUB_H
|
|
#define _KUNIT_STATIC_STUB_H
|
|
|
|
#if !IS_ENABLED(CONFIG_KUNIT)
|
|
|
|
/* If CONFIG_KUNIT is not enabled, these stubs quietly disappear. */
|
|
#define KUNIT_STATIC_STUB_REDIRECT(real_fn_name, args...) do {} while (0)
|
|
|
|
#else
|
|
|
|
#include <kunit/test.h>
|
|
#include <kunit/test-bug.h>
|
|
|
|
#include <linux/compiler.h> /* for {un,}likely() */
|
|
#include <linux/sched.h> /* for task_struct */
|
|
|
|
|
|
/**
|
|
* KUNIT_STATIC_STUB_REDIRECT() - call a replacement 'static stub' if one exists
|
|
* @real_fn_name: The name of this function (as an identifier, not a string)
|
|
* @args: All of the arguments passed to this function
|
|
*
|
|
* This is a function prologue which is used to allow calls to the current
|
|
* function to be redirected by a KUnit test. KUnit tests can call
|
|
* kunit_activate_static_stub() to pass a replacement function in. The
|
|
* replacement function will be called by KUNIT_STATIC_STUB_REDIRECT(), which
|
|
* will then return from the function. If the caller is not in a KUnit context,
|
|
* the function will continue execution as normal.
|
|
*
|
|
* Example:
|
|
*
|
|
* .. code-block:: c
|
|
*
|
|
* int real_func(int n)
|
|
* {
|
|
* KUNIT_STATIC_STUB_REDIRECT(real_func, n);
|
|
* return 0;
|
|
* }
|
|
*
|
|
* int replacement_func(int n)
|
|
* {
|
|
* return 42;
|
|
* }
|
|
*
|
|
* void example_test(struct kunit *test)
|
|
* {
|
|
* kunit_activate_static_stub(test, real_func, replacement_func);
|
|
* KUNIT_EXPECT_EQ(test, real_func(1), 42);
|
|
* }
|
|
*
|
|
*/
|
|
#define KUNIT_STATIC_STUB_REDIRECT(real_fn_name, args...) \
|
|
do { \
|
|
typeof(&real_fn_name) replacement; \
|
|
struct kunit *current_test = kunit_get_current_test(); \
|
|
\
|
|
if (likely(!current_test)) \
|
|
break; \
|
|
\
|
|
replacement = kunit_hooks.get_static_stub_address(current_test, \
|
|
&real_fn_name); \
|
|
\
|
|
if (unlikely(replacement)) \
|
|
return replacement(args); \
|
|
} while (0)
|
|
|
|
/* Helper function for kunit_activate_static_stub(). The macro does
|
|
* typechecking, so use it instead.
|
|
*/
|
|
void __kunit_activate_static_stub(struct kunit *test,
|
|
void *real_fn_addr,
|
|
void *replacement_addr);
|
|
|
|
/**
|
|
* kunit_activate_static_stub() - replace a function using static stubs.
|
|
* @test: A pointer to the 'struct kunit' test context for the current test.
|
|
* @real_fn_addr: The address of the function to replace.
|
|
* @replacement_addr: The address of the function to replace it with.
|
|
*
|
|
* When activated, calls to real_fn_addr from within this test (even if called
|
|
* indirectly) will instead call replacement_addr. The function pointed to by
|
|
* real_fn_addr must begin with the static stub prologue in
|
|
* KUNIT_STATIC_STUB_REDIRECT() for this to work. real_fn_addr and
|
|
* replacement_addr must have the same type.
|
|
*
|
|
* The redirection can be disabled again with kunit_deactivate_static_stub().
|
|
*/
|
|
#define kunit_activate_static_stub(test, real_fn_addr, replacement_addr) do { \
|
|
typecheck_fn(typeof(&real_fn_addr), replacement_addr); \
|
|
__kunit_activate_static_stub(test, real_fn_addr, replacement_addr); \
|
|
} while (0)
|
|
|
|
|
|
/**
|
|
* kunit_deactivate_static_stub() - disable a function redirection
|
|
* @test: A pointer to the 'struct kunit' test context for the current test.
|
|
* @real_fn_addr: The address of the function to no-longer redirect
|
|
*
|
|
* Deactivates a redirection configured with kunit_activate_static_stub(). After
|
|
* this function returns, calls to real_fn_addr() will execute the original
|
|
* real_fn, not any previously-configured replacement.
|
|
*/
|
|
void kunit_deactivate_static_stub(struct kunit *test, void *real_fn_addr);
|
|
|
|
#endif
|
|
#endif
|