WARNING: drivers/iommu/built-in.o(.text+0x617a): Section mismatch in reference from the function amd_iommu_init_pci() to the function .init.text:amd_iommu_init_devices()

Hi Joerg,

There are new compile warnings show up in

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git irq-remapping
head:   afd6b14061a786c34b41722d35035d0eeecae55c
commit: ac2ff05e6451271c6744e9c9d9742de40575dbce [7/28] iommu/amd: Introduce early_amd_iommu_init routine

All warnings:

WARNING: drivers/iommu/built-in.o(.text+0x617a): Section mismatch in reference from the function amd_iommu_init_pci() to the function .init.text:amd_iommu_init_devices() The function amd_iommu_init_pci() references
the function __init amd_iommu_init_devices().
This is often because amd_iommu_init_pci lacks a __init
annotation or the annotation of amd_iommu_init_devices is wrong.

WARNING: drivers/iommu/built-in.o(.text+0x6a18): Section mismatch in reference from the function amd_iommu_init_hardware() to the function .init.text:early_amd_iommu_init() The function amd_iommu_init_hardware() references
the function __init early_amd_iommu_init().
This is often because amd_iommu_init_hardware lacks a __init
annotation or the annotation of early_amd_iommu_init is wrong.

WARNING: drivers/built-in.o(.text+0x13ec1a): Section mismatch in reference from the function amd_iommu_init_pci() to the function .init.text:amd_iommu_init_devices() The function amd_iommu_init_pci() references
the function __init amd_iommu_init_devices().
This is often because amd_iommu_init_pci lacks a __init
annotation or the annotation of amd_iommu_init_devices is wrong.

WARNING: drivers/built-in.o(.text+0x13f4b8): Section mismatch in reference from the function amd_iommu_init_hardware() to the function .init.text:early_amd_iommu_init() The function amd_iommu_init_hardware() references
the function __init early_amd_iommu_init().
This is often because amd_iommu_init_hardware lacks a __init
annotation or the annotation of early_amd_iommu_init is wrong.

WARNING: vmlinux.o(.text+0x4de732): Section mismatch in reference from the function amd_iommu_init_pci() to the function .init.text:amd_iommu_init_devices() The function amd_iommu_init_pci() references
the function __init amd_iommu_init_devices().
This is often because amd_iommu_init_pci lacks a __init
annotation or the annotation of amd_iommu_init_devices is wrong.

WARNING: vmlinux.o(.text+0x4defd0): Section mismatch in reference from the function amd_iommu_init_hardware() to the function .init.text:early_amd_iommu_init() The function amd_iommu_init_hardware() references
the function __init early_amd_iommu_init().
This is often because amd_iommu_init_hardware lacks a __init
annotation or the annotation of early_amd_iommu_init is wrong.

---
0-DAY kernel build testing backend Open Source Technology Centre
Fengguang Wu <wfg-VuQAYsv1563Yd54FQh9/[email protected]> Intel Corporation

From: Joerg Roedel <[email protected]>
Date: Tue, 12 Jun 2012 12:09:35 +0200
Subject: [PATCH] iommu/amd: Introduce early_amd_iommu_init routine

Split out the code to parse the ACPI table and setup relevant data structures into a new function.

---
 drivers/iommu/amd_iommu.c      |    1 -
 drivers/iommu/amd_iommu_init.c |   38 +++++++++++++++++++++++---------------
 2 files changed, 23 insertions(+), 16 deletions(-)

index a2e418c..cfa01c4 100644
@@ -376,19 +376,18 @@ DECLARE_STATS_COUNTER(cross_page);
 DECLARE_STATS_COUNTER(domain_flush_single);
 DECLARE_STATS_COUNTER(domain_flush_all);
 DECLARE_STATS_COUNTER(alloced_io_mem);
 DECLARE_STATS_COUNTER(total_map_requests);
 DECLARE_STATS_COUNTER(complete_ppr);
 DECLARE_STATS_COUNTER(invalidate_iotlb);
 DECLARE_STATS_COUNTER(invalidate_iotlb_all);
 DECLARE_STATS_COUNTER(pri_requests);
 
-
 static struct dentry *stats_dir;
 static struct dentry *de_fflush;
 
 static void amd_iommu_stats_add(struct __iommu_counter *cnt)
 {
 	if (stats_dir == NULL)
 		return;
 
 	cnt->dent = debugfs_create_u64(cnt->name, 0444, stats_dir,

index e6782fa..1b23235 100644
@@ -1488,29 +1488,26 @@ static void __init free_on_init_error(void)
  *
  *	3 pass) After the basic data structures are allocated and
  *		initialized we update them with information about memory
  *		remapping requirements parsed out of the ACPI table in
  *		this last pass.
  *
  * After everything is set up the IOMMUs are enabled and the necessary
  * hotplug and suspend notifiers are registered.
  */
-int __init amd_iommu_init_hardware(void)
+static int __init early_amd_iommu_init(void)
 {
 	struct acpi_table_header *ivrs_base;
 	acpi_size ivrs_size;
 	acpi_status status;
 	int i, ret = 0;
 
-	if (no_iommu || (iommu_detected && !gart_iommu_aperture))
-		return -ENODEV;
-
-	if (amd_iommu_disabled || !amd_iommu_detected)
+	if (!amd_iommu_detected)
 		return -ENODEV;
 
 	if (amd_iommu_dev_table != NULL) {
 		/* Hardware already initialized */
 		return 0;
 	}
 
 	status = acpi_get_table_with_size("IVRS", 0, &ivrs_base, &ivrs_size);
 	if (status == AE_NOT_FOUND)

@@ -1585,41 +1582,52 @@ int __init amd_iommu_init_hardware(void)
 	 */
 	ret = init_iommu_all(ivrs_base);
 	if (ret)
 		goto free;
 
 	ret = init_memory_definitions(ivrs_base);
 	if (ret)
 		goto free;
 
-	ret = amd_iommu_init_pci();
-	if (ret)
-		goto free;
-
-	enable_iommus();
-
-	amd_iommu_init_notifier();
-
-	register_syscore_ops(&amd_iommu_syscore_ops);
-
 out:
 	/* Don't leak any ACPI memory */
 	early_acpi_os_unmap_memory((char *)ivrs_base, ivrs_size);
 	ivrs_base = NULL;
 
 	return ret;
 
 free:
 	free_on_init_error();
 
 	goto out;
 }
 
+int amd_iommu_init_hardware(void)
+{
+	int ret = 0;
+
+	ret = early_amd_iommu_init();
+	if (ret)
+		return ret;
+
+	ret = amd_iommu_init_pci();
+	if (ret)
+		return ret;
+
+	enable_iommus();
+
+	amd_iommu_init_notifier();
+
+	register_syscore_ops(&amd_iommu_syscore_ops);
+
+	return ret;
+}
+
 static int amd_iommu_enable_interrupts(void)
 {
 	struct amd_iommu *iommu;
 	int ret = 0;
 
 	for_each_iommu(iommu) {
 		ret = iommu_init_msi(iommu);
 		if (ret)
 			goto out;

1.7.10

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