Re: AGP bogosities
From: OGAWA Hirofumi
Date: Sat Mar 12 2005 - 17:33:54 EST
Linus Torvalds <torvalds@xxxxxxxx> writes:
> Btw, this should probably check for negative 32-bit values too, ie the
> test should probably be
> if ((int)atomic_read(v) <= 0)
> and it should probably be done for the regular atomic_dec() etc cases too,
> not just the dec-and-test. "atomic" values simply aren't historically
> well-defined for negative values (sparc used to limit them to 24 bits), so
> a negative thing would always be a bug, I think.
However, inode->i_writecount and some stuffs seems to be already using
the negative values (or sparc was used the signed 24 bits value).
Anyway, unfortunately inode->i_writecount triggered in atomic_dec().
OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
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