[dpdk-dev] [PATCH] kni: fix build with Linux 5.9

[Min Hu (Connor)]

Build error seen with Linux kernel 5.9.

Build error:
kernel/linux/kni/kni_dev.h:104:30:
	error: passing argument 1 of ‘get_user_pages_remote’ from
	incompatible pointer type [-Werror=incompatible-pointer-types]
	ret = get_user_pages_remote(tsk, tsk->mm, iova, 1,

get_user_pages_remote() is changed in Linux kernel version 5.9 and
remove a parameter, struct task_struct *tsk:
Linux Commit 64019a2e467a ("mm/gup: remove task_struct pointer
for all gup code")

get_user_pages_remote() parameter updated with compile time Linux
kernel version check.

Cc: stable at dpdk.org

Signed-off-by: Min Hu (Connor) <humin29 at huawei.com>
Reviewed-by: Wei Hu (Xavier) <xavier.huwei at huawei.com>
---
 kernel/linux/kni/kni_dev.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/linux/kni/kni_dev.h b/kernel/linux/kni/kni_dev.h
index ca5f92a..192c3d9 100644
--- a/kernel/linux/kni/kni_dev.h
+++ b/kernel/linux/kni/kni_dev.h
@@ -101,8 +101,13 @@ static inline phys_addr_t iova_to_phys(struct task_struct *tsk,
 	offset = iova & (PAGE_SIZE - 1);
 
 	/* Read one page struct info */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0)
+	ret = get_user_pages_remote(tsk->mm, iova, 1,
+				    FOLL_TOUCH, &page, NULL, NULL);
+#else
 	ret = get_user_pages_remote(tsk, tsk->mm, iova, 1,
 				    FOLL_TOUCH, &page, NULL, NULL);
+#endif /* >= 5.9.0 */
 	if (ret < 0)
 		return 0;
 
-- 
2.7.4