Re: [PATCH 4/5] x86-64: Replace vsyscall gettimeofday fallback withint 0xcc

[Jesper Juhl]

On Fri, 27 May 2011, Andy Lutomirski wrote:

> Now the only way to issue a syscall with side effects through the
> vsyscall page is to call a misaligned instruction.  I haven't
> checked for that.
> 
> Signed-off-by: Andy Lutomirski <luto@xxxxxxx>
> ---
>  arch/x86/include/asm/traps.h    |    4 +++
>  arch/x86/include/asm/vsyscall.h |    6 +++++
>  arch/x86/kernel/entry_64.S      |    2 +
>  arch/x86/kernel/traps.c         |    4 +++
>  arch/x86/kernel/vsyscall_64.c   |   47 ++++++++++++++++++++++++++++++++++-----
>  5 files changed, 57 insertions(+), 6 deletions(-)
> 

one very tiny nit below.

[...]
> diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
> index b9b6716..d34894e 100644
> --- a/arch/x86/kernel/traps.c
> +++ b/arch/x86/kernel/traps.c
> @@ -872,6 +872,10 @@ void __init trap_init(void)
>  	set_bit(SYSCALL_VECTOR, used_vectors);
>  #endif
>  
> +	set_system_intr_gate(0xCC, &intcc);
> +	set_bit(0xCC, used_vectors);
> +	printk(KERN_ERR "intcc gate isntalled\n");

Let's spell the error message correctly:

	printk(KERN_ERR "intcc gate installed\n");

-- 
Jesper Juhl <jj@xxxxxxxxxxxxx>       http://www.chaosbits.net/
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