From f14b4706b0d04988e7e5bc8c4d2aefef9f029d9d Mon Sep 17 00:00:00 2001 From: Michael Weiser Date: Fri, 5 Aug 2016 18:43:55 +0200 Subject: [PATCH] Adjust to recent user page API changes 4.6.0 basically renamed get_user_pages() to get_user_pages_remote() and introduced a new get_user_pages() that always works on the current task.[1] Distinguish the two APIs based on kernel version we're compiling for. Also, there seems to have been a massive cleansing of page_cache_release(page) in favour of put_page(page)[2] which was an alias for put_page(page)[3] since 2.6.0. Before that beginning with 2.4.0 both page_cache_release(page) and put_page(page) have been aliases for __free_page(page). So using put_page() instead of page_cache_release(page) will produce identical code for anything after 2.4.0. [1] https://lkml.org/lkml/2016/2/10/555 [2] https://www.spinics.net/lists/linux-fsdevel/msg95923.html [3] https://www.spinics.net/lists/linux-fsdevel/msg95922.html --- zc.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/zc.c b/zc.c index 29b0501..a97b49f 100644 --- a/zc.c +++ b/zc.c @@ -59,7 +59,12 @@ int __get_userbuf(uint8_t __user *addr, uint32_t len, int write, } down_read(&mm->mmap_sem); - ret = get_user_pages(task, mm, +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 6, 0)) + ret = get_user_pages_remote( +#else + ret = get_user_pages( +#endif + task, mm, (unsigned long)addr, pgcount, write, 0, pg, NULL); up_read(&mm->mmap_sem); if (ret != pgcount) @@ -119,7 +124,7 @@ void release_user_pages(struct csession *ses) else ses->readonly_pages--; - page_cache_release(ses->pages[i]); + put_page(ses->pages[i]); } ses->used_pages = 0; }