Hi,
On 4/11/22 05:31, Mark Rutland wrote:
On Tue, Apr 05, 2022 at 01:51:30PM +0100, Mark Rutland wrote:
Hi all,
[adding kernel folk who work on asm stuff]
As a heads-up, GCC 12 (not yet released) appears to erroneously optimize away
calls to functions with volatile asm. Szabolcs has raised an issue on the GCC
bugzilla:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105160
... which is a P1 release blocker, and is currently being investigated.
Jan Hubicka fixed this in GCC commit:
aabb9a261ef060cf ("Propagate nondeterministic and side_effects flags in modref
summary after inlining")
... and all my local tests look good with that applied.
Compiler explorer's trunk build now has that fix, so the examples from before
now look good:
aarch64: https://godbolt.org/z/vMczqjYvs
x86_64: https://godbolt.org/z/cveff9hq5
Jeremy, now that the real issue has been identified and fixed, I assume you'll
send a revert for commit:
8d3ea3d402db94b6 ("net: bcmgenet: Use stronger register read/writes to assure
ordering")
... ?
Yes, that's the plan.
Thanks,
