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X-OriginatorOrg: intel.com Hi Brian, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/bcain/linux.git bcain/qemu_boot head: 844bcfb5bee7bf0e713f61307dc2a4e16963c2f9 commit: 520783c1a795b1b4bd4c87483c2300e9f8e866c6 [34/87] hexagon: work around QEMU uart_port_activate codegen bug config: parisc-defconfig (https://download.01.org/0day-ci/archive/20260822/202608222156.tLRgZ1JT-lkp@intel.com/config) compiler: hppa-linux-gcc (GCC) 16.1.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260822/202608222156.tLRgZ1JT-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202608222156.tLRgZ1JT-lkp@intel.com/ All warnings (new ones prefixed by >>): >> drivers/tty/serial/serial_core.c:1939:1: warning: 'optnone' attribute directive ignored [-Wattributes] 1939 | { | ^ vim +/optnone +1939 drivers/tty/serial/serial_core.c 1c7b13c4886f5c drivers/tty/serial/serial_core.c Jiri Slaby 2011-11-09 1931 520783c1a795b1 drivers/tty/serial/serial_core.c Brian Cain 2026-01-26 1932 /* 520783c1a795b1 drivers/tty/serial/serial_core.c Brian Cain 2026-01-26 1933 * Work around QEMU hexagon emulation bug: the conditional 520783c1a795b1 drivers/tty/serial/serial_core.c Brian Cain 2026-01-26 1934 * memd + dealloc_return packet generated at -O2 corrupts 520783c1a795b1 drivers/tty/serial/serial_core.c Brian Cain 2026-01-26 1935 * callee-saved registers due to incorrect packet semantics. 520783c1a795b1 drivers/tty/serial/serial_core.c Brian Cain 2026-01-26 1936 */ 520783c1a795b1 drivers/tty/serial/serial_core.c Brian Cain 2026-01-26 1937 static int __attribute__((optnone)) 520783c1a795b1 drivers/tty/serial/serial_core.c Brian Cain 2026-01-26 1938 uart_port_activate(struct tty_port *port, struct tty_struct *tty) b3b57646186400 drivers/tty/serial/serial_core.c Rob Herring 2016-08-22 @1939 { b3b57646186400 drivers/tty/serial/serial_core.c Rob Herring 2016-08-22 1940 struct uart_state *state = container_of(port, struct uart_state, port); b3b57646186400 drivers/tty/serial/serial_core.c Rob Herring 2016-08-22 1941 struct uart_port *uport; 13b18d35909707 drivers/tty/serial/serial_core.c Serge Semin 2019-05-08 1942 int ret; b3b57646186400 drivers/tty/serial/serial_core.c Rob Herring 2016-08-22 1943 4047b37122d1be drivers/tty/serial/serial_core.c Peter Hurley 2016-04-09 1944 uport = uart_port_check(state); b3b57646186400 drivers/tty/serial/serial_core.c Rob Herring 2016-08-22 1945 if (!uport || uport->flags & UPF_DEAD) b3b57646186400 drivers/tty/serial/serial_core.c Rob Herring 2016-08-22 1946 return -ENXIO; ^1da177e4c3f41 drivers/serial/serial_core.c Linus Torvalds 2005-04-16 1947 ^1da177e4c3f41 drivers/serial/serial_core.c Linus Torvalds 2005-04-16 1948 /* ^1da177e4c3f41 drivers/serial/serial_core.c Linus Torvalds 2005-04-16 1949 * Start up the serial port. ^1da177e4c3f41 drivers/serial/serial_core.c Linus Torvalds 2005-04-16 1950 */ dcd794c6ed631b drivers/tty/serial/serial_core.c Ilpo Järvinen 2023-01-17 1951 ret = uart_startup(tty, state, false); 13b18d35909707 drivers/tty/serial/serial_core.c Serge Semin 2019-05-08 1952 if (ret > 0) 9b5aa54986fc85 drivers/tty/serial/serial_core.c Ilpo Järvinen 2023-01-17 1953 tty_port_set_active(port, true); 13b18d35909707 drivers/tty/serial/serial_core.c Serge Semin 2019-05-08 1954 13b18d35909707 drivers/tty/serial/serial_core.c Serge Semin 2019-05-08 1955 return ret; ^1da177e4c3f41 drivers/serial/serial_core.c Linus Torvalds 2005-04-16 1956 } ^1da177e4c3f41 drivers/serial/serial_core.c Linus Torvalds 2005-04-16 1957 :::::: The code at line 1939 was first introduced by commit :::::: b3b57646186400d4f54652ab7bbf55f5764d9467 tty: serial_core: convert uart_open to use tty_port_open :::::: TO: Rob Herring :::::: CC: Greg Kroah-Hartman -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki