Re: [PATCH] Define wc_wmb, a write barrier for PCI write combining

>>>>> "Bryan" == Bryan O'Sullivan <[email protected]> writes:

Bryan> On some platforms, a regular wmb() is not sufficient to
Bryan> guarantee that PCI writes have been flushed to the bus if write
Bryan> combining is in effect.

Bryan> This change introduces a new macro, wc_wmb(), that makes this
Bryan> guarantee.

Bryan,

Could you explain why the current mmiowb() API won't suffice for this?
It seems that this is basically trying to achieve the same thing.

Cheers,
Jes
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• Follow-Ups:
  • Re: [PATCH] Define wc_wmb, a write barrier for PCI write combining
    • From: "Bryan O'Sullivan" <[email protected]>
  • Re: [PATCH] Define wc_wmb, a write barrier for PCI write combining
    • From: Roland Dreier <[email protected]>

• References:
  • [PATCH] Define wc_wmb, a write barrier for PCI write combining
    • From: "Bryan O'Sullivan" <[email protected]>

• Prev by Date: Re: + fix-next_timer_interrupt-for-hrtimer.patch added to -mm tree
• Next by Date: Re: + fix-next_timer_interrupt-for-hrtimer.patch added to -mm tree
• Previous by thread: Re: [PATCH] Define wc_wmb, a write barrier for PCI write combining
• Next by thread: Re: [PATCH] Define wc_wmb, a write barrier for PCI write combining
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]