[0/4] MIPS: Fix missing proto and passing arg warnings

Message

Serge Semin Feb. 15, 2024, 5:17 p.m. UTC

After getting my local tree rebased onto the kernel 6.8-rc3 the MIPS32
kernel build procedure produced a couple of warnings which I suggest to
fix in the framework of this series.

A first warning is of the "no previous prototype for `<func>`" type. In
particular my arch-specific code has the mips_cm_l2sync_phys_base() method
re-defined, but even though the function is global it' prototype isn't
declared anywhere. Fix that by adding the method prototype declaration to
the mips/include/asm/mips-cm.h header file. A similar solution was
provided for the methods:
__mips_cm_l2sync_phys_base()
mips_cm_phys_base()
__mips_cm_phys_base()
too (Please see the patches 1/4 and 2/4 notes section for an alternative
suggestion of the way to fix the warning).

One more case of the denoted warning I spotted in the self-extracting
kernel (so called zboot) with the debug printouts enabled. In particular
there are several putc() method re-definitions available in:
arch/mips/boot/compressed/uart-prom.c
arch/mips/boot/compressed/uart-16550.c
arch/mips/boot/compressed/uart-alchemy.c
All of these files lacked the prototype declaration what caused having the
"no previous prototype for ‘putc’" printed on my build with the next
configs enabled:
CONFIG_SYS_SUPPORTS_ZBOOT=y
CONFIG_SYS_SUPPORTS_ZBOOT_UART_PROM=y
CONFIG_ZBOOT_LOAD_ADDRESS=0x85100000
CONFIG_DEBUG_ZBOOT=y

The second warning is of the "passing argument <x> of ‘<func>’ from
incompatible pointer type" type which I discovered in the
drivers/tty/mips_ejtag_fdc.c driver. The problem most likely happened due
to the commit ce7cbd9a6c81 ("tty: mips_ejtag_fdc: use u8 for character
pointers").

That's it for today.) Thanks for review in advance. Any tests are very
welcome.

Cc: Alexey Malahov <[e-mail]>
Cc: Stephen Rothwell <[e-mail]>
Cc: Andrew Morton <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]

Serge Semin (4):
  mips: cm: Add __mips_cm_l2sync_phys_base prototype declaration
  mips: cm: Add CM GCR and L2-sync base address getters declarations
  mips: zboot: Fix "no previous prototype" build warning
  tty: mips_ejtag_fdc: Fix passing incompatible pointer type warning

 arch/mips/boot/compressed/uart-16550.c   |  2 ++
 arch/mips/boot/compressed/uart-alchemy.c |  2 ++
 arch/mips/boot/compressed/uart-prom.c    |  2 ++
 arch/mips/include/asm/mips-cm.h          | 16 ++++++++++++++++
 arch/mips/kernel/mips-cm.c               |  2 +-
 drivers/tty/mips_ejtag_fdc.c             |  2 +-
 6 files changed, 24 insertions(+), 2 deletions(-)