From c24c57a4cc8a2f64de32084958920773c0906bc7 Mon Sep 17 00:00:00 2001 From: Petr Mladek Date: Thu, 16 Jan 2020 16:31:43 +0100 Subject: livepatch/selftest: Clean up shadow variable names and type The shadow variable selftest is quite tricky. Especially it is problematic to understand what values are stored, returned, and printed. Make it easier to understand by using "int *var, **sv" variables consistently everywhere instead of the generic "void *", "ret", and "ctor_data". Signed-off-by: Petr Mladek Reviewed-by: Joe Lawrence Acked-by: Miroslav Benes Reviewed-by: Kamalesh Babulal Signed-off-by: Jiri Kosina --- lib/livepatch/test_klp_shadow_vars.c | 93 ++++++++++++++++++++---------------- 1 file changed, 52 insertions(+), 41 deletions(-) (limited to 'lib/livepatch') diff --git a/lib/livepatch/test_klp_shadow_vars.c b/lib/livepatch/test_klp_shadow_vars.c index fe5c413efe96..4e94f46234e8 100644 --- a/lib/livepatch/test_klp_shadow_vars.c +++ b/lib/livepatch/test_klp_shadow_vars.c @@ -60,36 +60,43 @@ static int ptr_id(void *ptr) */ static void *shadow_get(void *obj, unsigned long id) { - void *ret = klp_shadow_get(obj, id); + int **sv; + sv = klp_shadow_get(obj, id); pr_info("klp_%s(obj=PTR%d, id=0x%lx) = PTR%d\n", - __func__, ptr_id(obj), id, ptr_id(ret)); + __func__, ptr_id(obj), id, ptr_id(sv)); - return ret; + return sv; } static void *shadow_alloc(void *obj, unsigned long id, size_t size, gfp_t gfp_flags, klp_shadow_ctor_t ctor, void *ctor_data) { - void *ret = klp_shadow_alloc(obj, id, size, gfp_flags, ctor, - ctor_data); + int *var = ctor_data; + int **sv; + + sv = klp_shadow_alloc(obj, id, size, gfp_flags, ctor, var); pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n", __func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor), - ptr_id(ctor_data), ptr_id(ret)); - return ret; + ptr_id(var), ptr_id(sv)); + + return sv; } static void *shadow_get_or_alloc(void *obj, unsigned long id, size_t size, gfp_t gfp_flags, klp_shadow_ctor_t ctor, void *ctor_data) { - void *ret = klp_shadow_get_or_alloc(obj, id, size, gfp_flags, ctor, - ctor_data); + int *var = ctor_data; + int **sv; + + sv = klp_shadow_get_or_alloc(obj, id, size, gfp_flags, ctor, var); pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n", __func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor), - ptr_id(ctor_data), ptr_id(ret)); - return ret; + ptr_id(var), ptr_id(sv)); + + return sv; } static void shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor) @@ -110,18 +117,22 @@ static void shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor) /* Shadow variable constructor - remember simple pointer data */ static int shadow_ctor(void *obj, void *shadow_data, void *ctor_data) { - int **shadow_int = shadow_data; - *shadow_int = ctor_data; + int **sv = shadow_data; + int *var = ctor_data; + + *sv = var; pr_info("%s: PTR%d -> PTR%d\n", - __func__, ptr_id(shadow_int), ptr_id(ctor_data)); + __func__, ptr_id(sv), ptr_id(var)); return 0; } static void shadow_dtor(void *obj, void *shadow_data) { + int **sv = shadow_data; + pr_info("%s(obj=PTR%d, shadow_data=PTR%d)\n", - __func__, ptr_id(obj), ptr_id(shadow_data)); + __func__, ptr_id(obj), ptr_id(sv)); } static int test_klp_shadow_vars_init(void) @@ -134,7 +145,7 @@ static int test_klp_shadow_vars_init(void) int var1, var2, var3, var4; int **sv1, **sv2, **sv3, **sv4; - void *ret; + int **sv; ptr_id(NULL); ptr_id(&var1); @@ -146,8 +157,8 @@ static int test_klp_shadow_vars_init(void) * With an empty shadow variable hash table, expect not to find * any matches. */ - ret = shadow_get(obj, id); - if (!ret) + sv = shadow_get(obj, id); + if (!sv) pr_info(" got expected NULL result\n"); /* @@ -169,23 +180,23 @@ static int test_klp_shadow_vars_init(void) * Verify we can find our new shadow variables and that they point * to expected data. */ - ret = shadow_get(obj, id); - if (!ret) + sv = shadow_get(obj, id); + if (!sv) return -EINVAL; - if (ret == sv1 && *sv1 == &var1) + if (sv == sv1 && *sv1 == &var1) pr_info(" got expected PTR%d -> PTR%d result\n", ptr_id(sv1), ptr_id(*sv1)); - ret = shadow_get(obj + 1, id); - if (!ret) + sv = shadow_get(obj + 1, id); + if (!sv) return -EINVAL; - if (ret == sv2 && *sv2 == &var2) + if (sv == sv2 && *sv2 == &var2) pr_info(" got expected PTR%d -> PTR%d result\n", ptr_id(sv2), ptr_id(*sv2)); - ret = shadow_get(obj, id + 1); - if (!ret) + sv = shadow_get(obj, id + 1); + if (!sv) return -EINVAL; - if (ret == sv3 && *sv3 == &var3) + if (sv == sv3 && *sv3 == &var3) pr_info(" got expected PTR%d -> PTR%d result\n", ptr_id(sv3), ptr_id(*sv3)); @@ -197,10 +208,10 @@ static int test_klp_shadow_vars_init(void) if (!sv4) return -ENOMEM; - ret = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4); - if (!ret) + sv = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4); + if (!sv) return -EINVAL; - if (ret == sv4 && *sv4 == &var4) + if (sv == sv4 && *sv4 == &var4) pr_info(" got expected PTR%d -> PTR%d result\n", ptr_id(sv4), ptr_id(*sv4)); @@ -209,27 +220,27 @@ static int test_klp_shadow_vars_init(void) * longer find them. */ shadow_free(obj, id, shadow_dtor); /* sv1 */ - ret = shadow_get(obj, id); - if (!ret) + sv = shadow_get(obj, id); + if (!sv) pr_info(" got expected NULL result\n"); shadow_free(obj + 1, id, shadow_dtor); /* sv2 */ - ret = shadow_get(obj + 1, id); - if (!ret) + sv = shadow_get(obj + 1, id); + if (!sv) pr_info(" got expected NULL result\n"); shadow_free(obj + 2, id, shadow_dtor); /* sv4 */ - ret = shadow_get(obj + 2, id); - if (!ret) + sv = shadow_get(obj + 2, id); + if (!sv) pr_info(" got expected NULL result\n"); /* * We should still find an variable. */ - ret = shadow_get(obj, id + 1); - if (!ret) + sv = shadow_get(obj, id + 1); + if (!sv) return -EINVAL; - if (ret == sv3 && *sv3 == &var3) + if (sv == sv3 && *sv3 == &var3) pr_info(" got expected PTR%d -> PTR%d result\n", ptr_id(sv3), ptr_id(*sv3)); @@ -237,8 +248,8 @@ static int test_klp_shadow_vars_init(void) * Free all the variables, too. */ shadow_free_all(id + 1, shadow_dtor); /* sv3 */ - ret = shadow_get(obj, id); - if (!ret) + sv = shadow_get(obj, id); + if (!sv) pr_info(" shadow_get() got expected NULL result\n"); -- cgit