On Sat, 2012-07-21 at 00:54 +0530, Srivatsa S. Bhat wrote:
> PREEMPT_ACTIVE flag is bit 27, not 28. Fix the comment.
>
> Signed-off-by: Srivatsa S. Bhat <srivatsa.b...@linux.vnet.ibm.com>
> ---
>
> include/linux/hardirq.h | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h
> index bb7f309..305f23c 100644
> --- a/include/linux/hardirq.h
> +++ b/include/linux/hardirq.h
> @@ -22,7 +22,7 @@
> *
> * - bits 16-25 are the hardirq count (max # of nested hardirqs: 1024)
> * - bit 26 is the NMI_MASK
> - * - bit 28 is the PREEMPT_ACTIVE flag
> + * - bit 27 is the PREEMPT_ACTIVE flag
Sorry but in arch/x86/include/asm/thread_info.h we have:
#define PREEMPT_ACTIVE 0x10000000
Which happens to be the 28th bit, not 27th. Although, if an arch did not
define PREEMPT_ACTIVE it would be 27th.
Perhaps the correct thing to do is to say:
By default the following bits are defined as:
[...]
Different architectures may modify these.
And then add your change.
-- Steve
> *
> * PREEMPT_MASK: 0x000000ff
> * SOFTIRQ_MASK: 0x0000ff00
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