On Thu, Dec 12, 2024 at 07:35:41PM -0800, Andrew Morton wrote:

On Sun,  8 Dec 2024 21:45:15 +0100 Uros Bizjak [off-list ref] wrote:

quoted

Enable strict percpu address space checks via x86 named address space
qualifiers. Percpu variables are declared in __seg_gs/__seg_fs named
AS and kept named AS qualified until they are dereferenced via percpu
accessor. This approach enables various compiler checks for
cross-namespace variable assignments.

Please note that current version of sparse doesn't know anything about
__typeof_unqual__() operator. Avoid the usage of __typeof_unqual__()
when sparse checking is active to prevent sparse errors with unknowing
keyword. The proposed patch by Dan Carpenter to implement
__typeof_unqual__() handling in sparse is located at:

google("what the hell is typeof_unequal") failed me.

I'm glad I'm not the only person who read that as "equal" instead of
"qualified".

regards,
dan carpenter