linux-kernel - [PATCH v2 0/2] MIPS: Fix missing proto and passing arg warnings

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Date: Mon, 26 Feb 2024 13:54:20 +0300
From: Serge Semin <fancer.lancer@...il.com>
To: Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Arnd Bergmann <arnd@...db.de>,
	Jiaxun Yang <jiaxun.yang@...goat.com>
Cc: Serge Semin <fancer.lancer@...il.com>,
	Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mips@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/2] MIPS: Fix missing proto and passing arg warnings

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 moving the __mips_cm_l2sync_phys_base()
body to a weak implementation of mips_cm_l2sync_phys_base() and adding the
method prototype declaration to the mips/include/asm/mips-cm.h header
file. For the sake of unification a similar solution was provided for the
mips_cm_phys_base()/__mips_cm_phys_base() couple.

The following text describes the patches which have already merged in at
v1 stage of the patchset (see changelog v2).

One more case of the denoted earlier 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.

Link: https://lore.kernel.org/linux-mips/20240215171740.14550-1-fancer.lancer@gmail.com
Changelog v2:
- Drop aleady applied pateches:
  [PATCH 3/4] mips: zboot: Fix "no previous prototype" build warning
  [PATCH 4/4] tty: mips_ejtag_fdc: Fix passing incompatible pointer type warning
- Drop Linux serial mailing list and the respective maintainers from the
  Cc-list.
- Covert the underscored versions of the CM2/L2-sync base address
  getters to being the body of the weakly defined original methods.

Cc: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mips@...r.kernel.org
Cc: linux-kernel@...r.kernel.org

Serge Semin (2):
  mips: cm: Convert __mips_cm_l2sync_phys_base() to weak function
  mips: cm: Convert __mips_cm_phys_base() to weak function

 arch/mips/include/asm/mips-cm.h | 20 ++++++++++++++++----
 arch/mips/kernel/mips-cm.c      | 10 ++--------
 2 files changed, 18 insertions(+), 12 deletions(-)

-- 
2.43.0