Hi all, After merging the tip tree, today's linux-next build (x86_64 allmodconfig) failed like this: In file included from include/linux/uaccess.h:11, from include/linux/sched/task.h:11, from include/linux/sched/signal.h:9, from include/linux/rcuwait.h:6, from include/linux/percpu-rwsem.h:7, from include/linux/fs.h:33, from include/linux/huge_mm.h:8, from include/linux/mm.h:726, from drivers/media/common/videobuf2/frame_vector.c:5: drivers/media/common/videobuf2/frame_vector.c: In function 'get_vaddr_frames': drivers/media/common/videobuf2/frame_vector.c:46:31: error: 'mm' undeclared (first use in this function); did you mean 'tm'? 46 | start = untagged_addr(mm, start); | ^~ arch/x86/include/asm/uaccess.h:38:28: note: in definition of macro 'untagged_addr' 38 | __addr &= (mm)->context.untag_mask | sign; \ | ^~ drivers/media/common/videobuf2/frame_vector.c:46:31: note: each undeclared identifier is reported only once for each function it appears in 46 | start = untagged_addr(mm, start); | ^~ arch/x86/include/asm/uaccess.h:38:28: note: in definition of macro 'untagged_addr' 38 | __addr &= (mm)->context.untag_mask | sign; \ | ^~ Caused by commit 062c9b2996e9 ("mm: Pass down mm_struct to untagged_addr()") interacting with commit 6647e76ab623 ("v4l2: don't fall back to follow_pfn() if pin_user_pages_fast() fails") from Linus' tree. I have applied the following merge fix patch for today. From: Stephen Rothwell Date: Mon, 5 Dec 2022 11:55:52 +1100 Subject: [PATCH] fix up for "mm: Pass down mm_struct to untagged_addr()" interacting with "v4l2: don't fall back to follow_pfn() if pin_user_pages_fast() fails" Signed-off-by: Stephen Rothwell --- drivers/media/common/videobuf2/frame_vector.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/common/videobuf2/frame_vector.c b/drivers/media/common/videobuf2/frame_vector.c index 18124929b18d..13455a76a37e 100644 --- a/drivers/media/common/videobuf2/frame_vector.c +++ b/drivers/media/common/videobuf2/frame_vector.c @@ -43,7 +43,7 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames, if (WARN_ON_ONCE(nr_frames > vec->nr_allocated)) nr_frames = vec->nr_allocated; - start = untagged_addr(mm, start); + start = untagged_addr(current->mm, start); ret = pin_user_pages_fast(start, nr_frames, FOLL_FORCE | FOLL_WRITE | FOLL_LONGTERM, -- 2.35.1 -- Cheers, Stephen Rothwell