linux-kernel - Re: [PATCH v2 3/4] kprobes: move x86-specific blacklist symbols to arch directory

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Date:	Fri, 05 Apr 2013 11:36:32 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Oskar Andero <oskar.andero@...ymobile.com>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	davem@...emloft.net, anil.s.keshavamurthy@...el.com,
	ananth@...ibm.com, radovan.lekanovic@...ymobile.com,
	bjorn.davidsson@...ymobile.com,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: [PATCH v2 3/4] kprobes: move x86-specific blacklist symbols to
 arch directory

(2013/04/04 21:51), Oskar Andero wrote:
> From: Björn Davidsson <bjorn.davidsson@...ymobile.com>
> 
> The common kprobes blacklist contains x86-specific symbols.
> Looking for these in kallsyms takes unnecessary time during startup
> on non-X86 platform. The symbols where moved to
> arch/x86/kernel/kprobes/core.c.

OK, it looks good for me. :)

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>

> 
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: linux-arch@...r.kernel.org
> Reviewed-by: Radovan Lekanovic <radovan.lekanovic@...ymobile.com>
> Signed-off-by: Björn Davidsson <bjorn.davidsson@...ymobile.com>
> Signed-off-by: Oskar Andero <oskar.andero@...ymobile.com>
> ---
>  arch/x86/kernel/kprobes/core.c | 6 +++++-
>  kernel/kprobes.c               | 3 ---
>  2 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c
> index 4aa71a5..41ce6c1 100644
> --- a/arch/x86/kernel/kprobes/core.c
> +++ b/arch/x86/kernel/kprobes/core.c
> @@ -65,7 +65,11 @@ void jprobe_return_end(void);
>  DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
>  DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
>  
> -const char * const arch_kprobes_blacksyms[] = {};
> +const char * const arch_kprobes_blacksyms[] = {
> +	"native_get_debugreg",
> +	"irq_entries_start",
> +	"common_interrupt",
> +};
>  const size_t arch_kprobes_blacksyms_size = ARRAY_SIZE(arch_kprobes_blacksyms);
>  
>  #define stack_addr(regs) ((unsigned long *)kernel_stack_pointer(regs))
> diff --git a/kernel/kprobes.c b/kernel/kprobes.c
> index 7654278..58c9f4e 100644
> --- a/kernel/kprobes.c
> +++ b/kernel/kprobes.c
> @@ -95,9 +95,6 @@ static raw_spinlock_t *kretprobe_table_lock_ptr(unsigned long hash)
>   */
>  static const char * const common_kprobes_blacksyms[] = {
>  	"preempt_schedule",
> -	"native_get_debugreg",
> -	"irq_entries_start",
> -	"common_interrupt",
>  	"mcount",       /* mcount can be called from everywhere */
>  };
>  static const size_t common_kprobes_blacksyms_size =
> 


-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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