Re: [PATCH] Provide u64 version of jiffies_to_usecs() in kernel/tsacct.c

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To: Jonathan Lim <[email protected]>
Subject: Re: [PATCH] Provide u64 version of jiffies_to_usecs() in kernel/tsacct.c
From: "H. Peter Anvin" <[email protected]>
Date: Fri, 28 Dec 2007 20:52:06 -0800
Cc: [email protected], [email protected]
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Jonathan Lim wrote:

It's possible that the values used in and returned from jiffies_to_usecs() are
incorrect because of truncation when variables of type u64 are involved.  So a
function specific to that type is used instead.

Much worse than that. There are internal overflows in the conversions.See the patch I recently submitted to -mm.


	-hpa
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References:
- [PATCH] Provide u64 version of jiffies_to_usecs() in kernel/tsacct.c
  - From: Jonathan Lim <[email protected]>

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