On Fri, 29 Apr, at 07:48:31PM, Arnd Bergmann wrote: > gcc complains about a newly added file for the EFI Bootloader Control: > > drivers/firmware/efi/efibc.c: In function 'efibc_set_variable': > drivers/firmware/efi/efibc.c:53:1: error: the frame size of 2272 bytes is > larger than 1024 bytes [-Werror=frame-larger-than=] > > The problem is the declaration of a local variable of type > struct efivar_entry, which is by itself larger than the warning > limit of 1024 bytes. > > We know that the reboot notifiers are not called from a deep stack, > so this is not an actual bug, but we should still try to rework > the code to avoid the warning. We also know that reboot notifiers > are never run concurrently on multiple CPUs, so there is no problem > in just making the variable 'static'. I assumed reboot notifiers were guaranteed to be non-concurrent too but having dug into the callers of kernel_reboot(), I couldn't find any kind of mutual exclusion.
How/where is this guaranteed?
