linux-kernel - Re: [PATCH 09/13] Move bp_type_idx to kernel/event/hw

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Date:	Tue, 15 Sep 2015 10:06:07 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Palmer Dabbelt <palmer@...belt.com>
Cc:	arnd@...db.de, dhowells@...hat.com, viro@...iv.linux.org.uk,
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	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 09/13] Move bp_type_idx to kernel/event/hw_breakpoint.c

On Mon, Sep 14, 2015 at 03:50:43PM -0700, Palmer Dabbelt wrote:
> This has a "#ifdef CONFIG_*" that used to be exposed to userspace.
> 
> The names in here are so generic that I don't think it's a good idea
> to expose them to userspace (or even the rest of the kernel).  Since
> there's only one kernel user, it's been moved to that file.
> 
> Signed-off-by: Palmer Dabbelt <palmer@...belt.com>
> Reviewed-by: Andrew Waterman <waterman@...s.berkeley.edu>
> Reviewed-by: Albert Ou <aou@...s.berkeley.edu>
> ---
>  include/uapi/linux/hw_breakpoint.h | 10 ----------
>  kernel/events/hw_breakpoint.c      | 10 ++++++++++
>  2 files changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/include/uapi/linux/hw_breakpoint.h b/include/uapi/linux/hw_breakpoint.h
> index b04000a2296a..7a6a5a7f9511 100644
> --- a/include/uapi/linux/hw_breakpoint.h
> +++ b/include/uapi/linux/hw_breakpoint.h
> @@ -17,14 +17,4 @@ enum {
>  	HW_BREAKPOINT_INVALID   = HW_BREAKPOINT_RW | HW_BREAKPOINT_X,
>  };
>  
> -enum bp_type_idx {
> -	TYPE_INST 	= 0,
> -#ifdef CONFIG_HAVE_MIXED_BREAKPOINTS_REGS
> -	TYPE_DATA	= 0,
> -#else
> -	TYPE_DATA	= 1,
> -#endif
> -	TYPE_MAX
> -};

This is rather unfortunate; you are correct that the naming is too
generic (and I tend to agree), but I think these values are required by
userspace to fill out:

  perf_event_attr::bp_type

So removing them will break things.

Frederic?
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