On Tuesday, October 15, 2019 10:23:33 AM CEST Andy Shevchenko wrote: > On Tue, Oct 15, 2019 at 10:08:55AM +1100, Stephen Rothwell wrote: > > Hi all, > > > > After merging the pm tree, today's linux-next build (arm > > multi_v7_defconfig) produced this warning: > > > > In file included from include/linux/irqchip.h:14, > > from arch/arm/kernel/irq.c:26: > > include/linux/acpi.h:682:31: warning: 'struct acpi_device' declared inside parameter list will not be visible outside of this definition or declaration > > 682 | acpi_dev_hid_uid_match(struct acpi_device *adev, const char *hid2, const char *uid2) > > | ^~~~~~~~~~~ > > > > and many more. > > > > Introduced by commit > > > > d1748b57dc88 ("ACPI / utils: Introduce acpi_dev_hid_uid_match() helper") > > > > CONFIG_ACPI is not set for this build. > > I'm puzzled. Why it builds before? > > Another function has struct acpi_device *adev in its prototype and it was > before above mentioned commit. Right. The very next acpi_dev_get_first_match_dev() returns a pointer to struct acpi_device too and it is not modified by the commit in question. There may be a bug in there, but commit d1748b57dc88 doesn't look like the source of it.