linux-kernel - Re: [PATCH v2 4/5] f2fs: add tracepoint for f2fs_filemap

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Message-ID: <20190424091456.GB38756@jaegeuk-macbookpro.roam.corp.google.com>
Date:   Wed, 24 Apr 2019 10:14:56 +0100
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, chao@...nel.org
Subject: Re: [PATCH v2 4/5] f2fs: add tracepoint for f2fs_filemap_fault()

On 04/15, Chao Yu wrote:
> This patch adds tracepoint for f2fs_filemap_fault().
> 
> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> ---
> v2:
> - fix wrong type of @ret parameter
>  fs/f2fs/file.c              |  2 ++
>  include/trace/events/f2fs.h | 26 ++++++++++++++++++++++++++
>  2 files changed, 28 insertions(+)
> 
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 30d49467578e..578486e03427 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -39,6 +39,8 @@ static vm_fault_t f2fs_filemap_fault(struct vm_fault *vmf)
>  	ret = filemap_fault(vmf);
>  	up_read(&F2FS_I(inode)->i_mmap_sem);
>  
> +	trace_f2fs_filemap_fault(inode, vmf->pgoff, ret);

In order to avoid wrong casting warning, how about this?

---
 include/trace/events/f2fs.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index abe763cc1d0b..c29dea7ac0fe 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -1286,7 +1286,7 @@ DEFINE_EVENT(f2fs__page, f2fs_commit_inmem_page,
 
 TRACE_EVENT(f2fs_filemap_fault,
 
-	TP_PROTO(struct inode *inode, pgoff_t index, enum vm_fault_reason ret),
+	TP_PROTO(struct inode *inode, pgoff_t index, vm_fault_t ret),
 
 	TP_ARGS(inode, index, ret),
 
@@ -1294,7 +1294,7 @@ TRACE_EVENT(f2fs_filemap_fault,
 		__field(dev_t,	dev)
 		__field(ino_t,	ino)
 		__field(pgoff_t, index)
-		__field(enum vm_fault_reason, ret)
+		__field(vm_fault_t, ret)
 	),
 
 	TP_fast_assign(
@@ -1304,10 +1304,10 @@ TRACE_EVENT(f2fs_filemap_fault,
 		__entry->ret	= ret;
 	),
 
-	TP_printk("dev = (%d,%d), ino = %lu, index = %lu, ret = %u",
+	TP_printk("dev = (%d,%d), ino = %lu, index = %lu, ret = %lx",
 		show_dev_ino(__entry),
 		(unsigned long)__entry->index,
-		ret)
+		(unsigned long)__entry->ret)
 );
 
 TRACE_EVENT(f2fs_writepages,
-- 
2.19.0.605.g01d371f741-goog