drivers: Fix build for Linux v6.12

In Linux v6.12 the definition 'no_llseek' was finally removed. Since
Linux v6.0 it had been redefined as NULL. Add a test to conftest to
determine if 'no_llseek' is present and if not then it is no longer
necessary to populate this and we can leave as NULL.

Bug 4876974

Change-Id: I051fdb285b32260b5913dad89cabe0be04253f67
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3222106
(cherry picked from commit 7bf81a5b445b01a2adc8b947a29e9ca7db325c6f)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3270383
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: Brad Griffis <bgriffis@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>

drivers/media/platform/tegra/camera/fusa-capture/capture-isp-channel.c

@@ -1,5 +1,5 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
-// Copyright (c) 2017-2023 NVIDIA Corporation.  All rights reserved.
+// SPDX-FileCopyrightText: Copyright (c) 2017-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 
 /**
  * @file drivers/media/platform/tegra/camera/fusa-capture/capture-isp-channel.c
@@ -523,7 +523,9 @@ static long isp_channel_ioctl(
 
 static const struct file_operations isp_channel_fops = {
 	.owner = THIS_MODULE,
+#if defined(NV_NO_LLSEEK_PRESENT)
 	.llseek = no_llseek,
+#endif
 	.unlocked_ioctl = isp_channel_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl = isp_channel_ioctl,

drivers/media/platform/tegra/camera/fusa-capture/capture-vi-channel.c

@@ -616,7 +616,9 @@ static long vi_channel_ioctl(
 
 static const struct file_operations vi_channel_fops = {
 	.owner = THIS_MODULE,
+#if defined(NV_NO_LLSEEK_PRESENT)
 	.llseek = no_llseek,
+#endif
 	.unlocked_ioctl = vi_channel_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl = vi_channel_ioctl,

drivers/misc/nvsciipc/nvsciipc.c

@@ -685,7 +685,9 @@ static const struct file_operations nvsciipc_fops = {
 	.open		= nvsciipc_dev_open,
 	.release		= nvsciipc_dev_release,
 	.unlocked_ioctl	= nvsciipc_dev_ioctl,
+#if defined(NV_NO_LLSEEK_PRESENT)
 	.llseek		= no_llseek,
+#endif
 	.read		= nvsciipc_dbg_read,
 };
 

drivers/platform/tegra/rtcpu/camchar.c

@@ -1,5 +1,5 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
-// Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+// SPDX-FileCopyrightText: Copyright (c) 2022-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 
 #include <nvidia/conftest.h>
 
@@ -226,7 +226,9 @@ static const struct file_operations tegra_camchar_fops = {
 	.release = tegra_camchar_release,
 	.unlocked_ioctl = tegra_camchar_ioctl,
 	.compat_ioctl = tegra_camchar_ioctl,
+#if defined(NV_NO_LLSEEK_PRESENT)
 	.llseek = no_llseek,
+#endif
 };
 
 static int __init tegra_camchar_init(struct tegra_ivc_driver *drv)

drivers/video/tegra/host/nvcsi/nvcsi-t194.c

@@ -110,7 +110,9 @@ static int t194_nvcsi_release(struct inode *inode, struct file *file)
 
 const struct file_operations tegra194_nvcsi_ctrl_ops = {
 	.owner = THIS_MODULE,
+#if defined(NV_NO_LLSEEK_PRESENT)
 	.llseek = no_llseek,
+#endif
 	.unlocked_ioctl = t194_nvcsi_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl = t194_nvcsi_ioctl,

drivers/video/tegra/host/nvcsi/nvcsi.c

@@ -1,8 +1,11 @@
 // SPDX-License-Identifier: GPL-2.0-only
-// SPDX-FileCopyrightText: Copyright (c) 2014-2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+// SPDX-FileCopyrightText: Copyright (c) 2014-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 /*
  * NVCSI driver
  */
+
+#include <nvidia/conftest.h>
+
 #include <linux/device.h>
 #include <linux/export.h>
 #include <linux/module.h>
@@ -129,7 +132,9 @@ static int nvcsi_release(struct inode *inode, struct file *file)
 
 const struct file_operations tegra_nvcsi_ctrl_ops = {
 	.owner = THIS_MODULE,
+#if defined(NV_NO_LLSEEK_PRESENT)
 	.llseek = no_llseek,
+#endif
 	.unlocked_ioctl = nvcsi_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl = nvcsi_ioctl,

drivers/video/tegra/host/nvdla/nvdla_ioctl.c

@@ -1,10 +1,11 @@
 // SPDX-License-Identifier: GPL-2.0-only
+// SPDX-FileCopyrightText: Copyright (c) 2016-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 /*
- * Copyright (c) 2016-2023, NVIDIA Corporation.  All rights reserved.
- *
  * NVDLA IOCTL for T194
  */
 
+#include <nvidia/conftest.h>
+
 #include <linux/arm64-barrier.h>
 #include <linux/fs.h>
 #include <linux/platform_device.h>
@@ -1329,7 +1330,9 @@ static int nvdla_release(struct inode *inode, struct file *file)
 
 const struct file_operations tegra_nvdla_ctrl_ops = {
 	.owner = THIS_MODULE,
+#if defined(NV_NO_LLSEEK_PRESENT)
 	.llseek = no_llseek,
+#endif
 	.unlocked_ioctl = nvdla_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl = nvdla_ioctl,

drivers/video/tegra/host/pva/pva_ioctl.c

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
-/*
+// SPDX-FileCopyrightText: Copyright (c) 2016-2024, NVIDIA CORPORATION. All rights reserved.
- * Copyright (c) 2016-2023, NVIDIA CORPORATION. All rights reserved.
+
- */
+#include <nvidia/conftest.h>
 
 #include <linux/err.h>
 #include <linux/jiffies.h>
@@ -1134,7 +1134,9 @@ static ssize_t pva_read_vpu_print_buffer(struct file *file,
 
 const struct file_operations tegra_pva_ctrl_ops = {
 	.owner = THIS_MODULE,
+#if defined(NV_NO_LLSEEK_PRESENT)
 	.llseek = no_llseek,
+#endif
 	.unlocked_ioctl = pva_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl = pva_ioctl,

drivers/virt/tegra/tegra_hv_pm_ctl.c

@@ -389,7 +389,9 @@ static int tegra_hv_pm_ctl_release(struct inode *inode, struct file *filp)
 
 static const struct file_operations tegra_hv_pm_ctl_fops = {
 	.owner		= THIS_MODULE,
+#if defined(NV_NO_LLSEEK_PRESENT)
 	.llseek		= no_llseek,
+#endif
 	.read		= tegra_hv_pm_ctl_read,
 	.write		= tegra_hv_pm_ctl_write,
 	.poll		= tegra_hv_pm_ctl_poll,

scripts/conftest/Makefile

@@ -142,6 +142,7 @@ NV_CONFTEST_FUNCTION_COMPILE_TESTS += mii_bus_struct_has_read_c45
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += mii_bus_struct_has_write_c45
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += netif_set_tso_max_size
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += netif_napi_add_weight
+NV_CONFTEST_FUNCTION_COMPILE_TESTS += no_llseek
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += of_get_named_gpio_flags
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += gpio_chip_struct_has_of_node_present
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += gpio_device_find

scripts/conftest/conftest.sh

@@ -7462,6 +7462,25 @@ compile_test() {
             compile_check_conftest "$CODE" "NV_MII_BUS_STRUCT_HAS_WRITE_C45" "" "types"
         ;;
 
+        no_llseek)
+            #
+            # Determine if the function no_llseek() is present.
+            #
+            # Commit cb787f4ac0c2 ("[tree-wide] finally take no_llseek out")
+            # removed the definition for no_llseek() in Linux v6.12-rc1. Note
+            # that commit 868941b14441 ("fs: remove no_llseek") in Linux v6.0
+            # had previously redefined no_llseek as NULL in preparation for
+            # its removal.
+            #
+            CODE="
+            #include <linux/fs.h>
+            void conftest_no_llseek(void) {
+                no_llseek();
+            }"
+
+            compile_check_conftest "$CODE" "NV_NO_LLSEEK_PRESENT" "" "functions"
+        ;;
+
         of_property_for_each_u32_removed_internal_args)
             #
             # Determine if the internal arguments for the macro