Messages in this thread | | | Date | Mon, 22 Dec 2003 07:00:26 -0800 | From | William Lee Irwin III <> | Subject | Re: atomic copy_from_user? |
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On Sun, Dec 21, 2003 at 07:48:20PM -0500, Albert Cahalan wrote: > Surely I'm not the only one wanting such a beast...? > From some naughty place in the code where might_sleep > would trigger, I'd like to read from user memory. > I'll pretty much assume that mlockall() has been > called. Suppose that "current" is correct as well. > I'd just use a pointer directly, except that: > a. it isn't OK for the 4g/4g feature, s390, or sparc64 > b. it causes the "sparse" type checker to complain > c. it will oops or worse if the user screwed up > If the page is swapped out, I want a failed copy.
c.f. kmap_atomic() usage in mm/filemap.c
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