kernel: kernel_compat: Remove inline get_cred_rcu

Since commit:
kernel: core_hook: switch to prepare_creds (c58e102)

get_cred_rcu is no longer needed.

Signed-off-by: rsuntk <[email protected]>

Author: rsuntk

kernel/Makefile

@@ -45,18 +45,6 @@ ifeq ($(shell grep -q "struct selinux_state " $(srctree)/security/selinux/includ
 ccflags-y += -DKSU_COMPAT_HAS_SELINUX_STATE
 endif
 
-# This feature was introduced in linux 5.0-rc1
-ifeq ($(shell grep -q "get_cred_rcu" $(srctree)/include/linux/cred.h; echo $$?),0)
-ccflags-y += -DKSU_COMPAT_HAS_GET_CRED_RCU
-else
-ifeq ($(shell grep -q "atomic_long_t\s\+usage" $(srctree)/include/linux/cred.h; echo $$?),0)
-ccflags-y += -DKSU_COMPAT_ATOMIC_LONG
-endif
-ifeq ($(shell grep -q "int\s\+non_rcu" $(srctree)/include/linux/cred.h; echo $$?),0)
-ccflags-y += -DKSU_COMPAT_HAS_NONCONST_CRED
-endif
-endif
-
 # Handle optional backports
 ifeq ($(shell grep -q "strncpy_from_user_nofault" $(srctree)/include/linux/uaccess.h; echo $$?),0)
 ccflags-y += -DKSU_OPTIONAL_STRNCPY

kernel/kernel_compat.h

@@ -7,27 +7,6 @@
 #include "ss/policydb.h"
 #include "linux/key.h"
 
-// for kernel without get_cred_rcu
-#ifndef KSU_COMPAT_HAS_GET_CRED_RCU
-static inline const struct cred *get_cred_rcu(const struct cred *cred)
-{
-	struct cred *nonconst_cred = (struct cred *) cred;
-	if (!cred)
-		return NULL;
-#ifdef KSU_COMPAT_ATOMIC_LONG
-	if (!atomic_long_inc_not_zero(&nonconst_cred->usage))
-#else
-	if (!atomic_inc_not_zero(&nonconst_cred->usage))
-#endif		
-		return NULL;
-	validate_creds(cred);
-#ifdef KSU_COMPAT_HAS_NONCONST_CRED
-	nonconst_cred->non_rcu = 0;
-#endif
-	return cred;
-}
-#endif
-
 /*
  * Adapt to Huawei HISI kernel without affecting other kernels ,
  * Huawei Hisi Kernel EBITMAP Enable or Disable Flag ,