On 5/3/19 8:06 AM, Peter Zijlstra wrote:
> On Sun, Apr 28, 2019 at 05:25:38PM -0400, Waiman Long wrote:
>> During my rwsem testing, it was found that after a down_read(), the
>> reader count may occasionally become 0 or even negative. Consequently,
>> a writer may steal the lock at that time and ex
On Sun, Apr 28, 2019 at 05:25:38PM -0400, Waiman Long wrote:
> During my rwsem testing, it was found that after a down_read(), the
> reader count may occasionally become 0 or even negative. Consequently,
> a writer may steal the lock at that time and execute with the reader
> in parallel thus break
During my rwsem testing, it was found that after a down_read(), the
reader count may occasionally become 0 or even negative. Consequently,
a writer may steal the lock at that time and execute with the reader
in parallel thus breaking the mutual exclusion guarantee of the write
lock. In other words,
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