On Tue, Mar 6, 2012 at 5:16 PM, Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> From: Steven Rostedt <rostedt@xxxxxxxxxxx>
>
> revert: seqlock-remove-unused-functions.patch
>
> Revert:
>
> Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Date: Sat Jul 16 18:38:22 2011 +0200
>
> seqlock-remove-unused-functions.patch
>
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
>
> Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
> ---
> include/linux/seqlock.h | 21 +++++++++++++++++++++
> 1 files changed, 21 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
> index b990f6e..c6db9fb 100644
> --- a/include/linux/seqlock.h
> +++ b/include/linux/seqlock.h
> @@ -69,6 +69,17 @@ static inline void write_sequnlock(seqlock_t *sl)
> spin_unlock(&sl->lock);
> }
>
> +static inline int write_tryseqlock(seqlock_t *sl)
> +{
> + int ret = spin_trylock(&sl->lock);
> +
> + if (ret) {
> + ++sl->sequence;
> + smp_wmb();
> + }
> + return ret;
> +}
> +
> /* Start of read calculation -- fetch last complete writer token */
> static __always_inline unsigned read_seqbegin(const seqlock_t *sl)
> {
> @@ -237,4 +248,14 @@ static inline void write_seqcount_barrier(seqcount_t *s)
> #define write_sequnlock_bh(lock) \
> do { write_sequnlock(lock); local_bh_enable(); } while(0)
>
> +#define read_seqbegin_irqsave(lock, flags) \
> + ({ local_irq_save(flags); read_seqbegin(lock); })
> +
> +#define read_seqretry_irqrestore(lock, iv, flags) \
> + ({ \
> + int ret = read_seqretry(lock, iv); \
> + local_irq_restore(flags); \
> + ret; \
> + })
> +
> #endif /* __LINUX_SEQLOCK_H */
> --
Does this really need to be reverted? I don't believe the other
reverts make use of these functions either. Looking upstream ,they are
also not used here, so the original patch should be pushed upstream if
anything.
Thanks
John
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