linux-kernel - Re: [PATCH] kernel: event: core: Change return type to vm_fault

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Date:   Fri, 20 Apr 2018 10:28:29 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     mingo@...hat.com, acme@...nel.org, linux-kernel@...r.kernel.org,
        willy@...radead.org
Subject: Re: [PATCH] kernel: event: core: Change return type to vm_fault_t

On Sun, Apr 15, 2018 at 01:58:31AM +0530, Souptick Joarder wrote:
> Use new return type vm_fault_t for fault handler and
> page_mkwrite handler in struct vm_operations_struct.
> 
> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
> Reviewed-by: Matthew Wilcox <mawilcox@...rosoft.com>
> ---
>  kernel/events/core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index 96db9ae..d09f1c4 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -4918,11 +4918,11 @@ void perf_event_update_userpage(struct perf_event *event)
>  }
>  EXPORT_SYMBOL_GPL(perf_event_update_userpage);
> 
> -static int perf_mmap_fault(struct vm_fault *vmf)
> +static vm_fault_t perf_mmap_fault(struct vm_fault *vmf)

I'm fine with the patch, but shouldn't this be part of a larger series /
cocinelle script?

Even if not everything that has a (struct vm_fault *) argument is a
fault handler, you could still match on the function being assigned to
vm_operations_struct::fault.

So ACK on the patch, but please don't do this with a slow trickle of
individual patches.