readl and raw_readl

[Kotteeswaran GS]

Hi,

I need a kind of explanation regarding readl/__raw_readl/readl_relaxed.

1) In what circumstances , Do I have to use raw_readl or readl or readl_relaxed?
2) which one is using memory barrier?

Please let me know.

Thanks,

Regards,
Kotteeswaran G S

[Anil Kumar Pugalia]

Check out this similar question on stackoverflow:
http://stackoverflow.com/questions/9818657/whats-the-difference-b-w-raw-readl-raw-writel-and-readl-writel-in-linux-ker

However, note that in latest kernels all these are discouraged, as there
are better replacements.

Regards
Anil

Passion: http://sysplay.in (Playing with Systems)

[Kotteeswaran GS]

Hi Anil,

Thanks for the information.
I would like to know about the replacement of readl in the latest
kernel,,can you point ut some links.

Thanks,

Regards,
Kotteeswaran G S

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[Anil Kumar Pugalia]

Check out the following link: http://www.makelinux.net/ldd3/chp-9-sect-4

Regards
Anil

Passion: http://sysplay.in (Playing with Systems)