Re: [PATCH] serial: icom: Fix namespace collision and startup() section placement with -ffunction-sections

[Jiri Slaby]

On 19. 11. 25, 7:27, Josh Poimboeuf wrote:
> When compiling the kernel with -ffunction-sections (e.g., for LTO,
> livepatch, dead code elimination, AutoFDO, or Propeller), the startup()
> function gets compiled into the .text.startup section.  In some cases it
> can even be cloned into .text.startup.constprop.0 or
> .text.startup.isra.0.
>
> However, the .text.startup and .text.startup.* section names are already
> reserved for use by the compiler for __attribute__((constructor)) code.
>
> This naming conflict causes the vmlinux linker script to wrongly place
> startup() function code in .init.text, which gets freed during boot.

This sounds rather error-prone. What are the patterns supposed to match 
actually? Can't *those* real victims™ be renamed to something less 
common instead?

> Fix that by renaming startup() to icom_startup().  For consistency, also
> rename its shutdown() counterpart to icom_shutdown().

I see also:
drivers/staging/media/atomisp/i2c/atomisp-gc2235.c:static int 
startup(struct v4l2_subdev *sd)
drivers/staging/media/atomisp/i2c/atomisp-ov2722.c:static int 
startup(struct v4l2_subdev *sd)
drivers/tty/amiserial.c:static int startup(struct tty_struct *tty, 
struct serial_state *info)
drivers/tty/synclink_gt.c:static int startup(struct slgt_info *info)

thanks,
--
js
suse labs