Merge tag 'x86_sgx_for_v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 SGX fixes from Borislav Petkov:
 "Random small fixes which missed the initial SGX submission. Also, some
  procedural clarifications"

* tag 'x86_sgx_for_v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  MAINTAINERS: Add Dave Hansen as reviewer for INTEL SGX
  x86/sgx: Drop racy follow_pfn() check
  MAINTAINERS: Fix the tree location for INTEL SGX patches
  x86/sgx: Fix the return type of sgx_init()

MAINTAINERS

@@ -9183,10 +9183,11 @@ F:	include/linux/tboot.h
 
 INTEL SGX
 M:	Jarkko Sakkinen <jarkko@kernel.org>
+R:	Dave Hansen <dave.hansen@linux.intel.com>
 L:	linux-sgx@vger.kernel.org
 S:	Supported
 Q:	https://patchwork.kernel.org/project/intel-sgx/list/
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-sgx.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/sgx
 F:	Documentation/x86/sgx.rst
 F:	arch/x86/entry/vdso/vsgx.S
 F:	arch/x86/include/uapi/asm/sgx.h

arch/x86/kernel/cpu/sgx/encl.c

@@ -141,7 +141,6 @@ static vm_fault_t sgx_vma_fault(struct vm_fault *vmf)
 	struct sgx_encl_page *entry;
 	unsigned long phys_addr;
 	struct sgx_encl *encl;
-	unsigned long pfn;
 	vm_fault_t ret;
 
 	encl = vma->vm_private_data;
@@ -168,13 +167,6 @@ static vm_fault_t sgx_vma_fault(struct vm_fault *vmf)
 
 	phys_addr = sgx_get_epc_phys_addr(entry->epc_page);
 
-	/* Check if another thread got here first to insert the PTE. */
-	if (!follow_pfn(vma, addr, &pfn)) {
-		mutex_unlock(&encl->lock);
-
-		return VM_FAULT_NOPAGE;
-	}
-
 	ret = vmf_insert_pfn(vma, addr, PFN_DOWN(phys_addr));
 	if (ret != VM_FAULT_NOPAGE) {
 		mutex_unlock(&encl->lock);

arch/x86/kernel/cpu/sgx/main.c

@@ -700,25 +700,27 @@ static bool __init sgx_page_cache_init(void)
 	return true;
 }
 
-static void __init sgx_init(void)
+static int __init sgx_init(void)
 {
 	int ret;
 	int i;
 
 	if (!cpu_feature_enabled(X86_FEATURE_SGX))
-		return;
+		return -ENODEV;
 
 	if (!sgx_page_cache_init())
-		return;
+		return -ENOMEM;
 
-	if (!sgx_page_reclaimer_init())
+	if (!sgx_page_reclaimer_init()) {
+		ret = -ENOMEM;
 		goto err_page_cache;
+	}
 
 	ret = sgx_drv_init();
 	if (ret)
 		goto err_kthread;
 
-	return;
+	return 0;
 
 err_kthread:
 	kthread_stop(ksgxd_tsk);
@@ -728,6 +730,8 @@ static void __init sgx_init(void)
 		vfree(sgx_epc_sections[i].pages);
 		memunmap(sgx_epc_sections[i].virt_addr);
 	}
+
+	return ret;
 }
 
 device_initcall(sgx_init);