linux-kernel - Re: [PATCH] csky: Fixup -Wmissing-prototypes warning

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Message-ID: <cd3924fb-8639-4fa5-8aae-bc2b20a63dec@roeck-us.net>
Date:   Wed, 30 Aug 2023 01:11:10 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     guoren@...nel.org
Cc:     arnd@...db.de, linux-csky@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Guo Ren <guoren@...ux.alibaba.com>,
        Arnd Bergmann <arnd@...nel.org>
Subject: Re: [PATCH] csky: Fixup -Wmissing-prototypes warning

On Thu, Aug 10, 2023 at 11:07:50PM -0400, guoren@...nel.org wrote:
> From: Guo Ren <guoren@...ux.alibaba.com>
> 
> Cleanup the warnings:
> 
> arch/csky/kernel/ptrace.c:320:16: error: no previous prototype for 'syscall_trace_enter' [-Werror=missing-prototypes]
> arch/csky/kernel/ptrace.c:336:17: error: no previous prototype for 'syscall_trace_exit' [-Werror=missing-prototypes]
> arch/csky/kernel/setup.c:116:34: error: no previous prototype for 'csky_start' [-Werror=missing-prototypes]
> arch/csky/kernel/signal.c:255:17: error: no previous prototype for 'do_notify_resume' [-Werror=missing-prototypes]
> arch/csky/kernel/traps.c:150:15: error: no previous prototype for 'do_trap_unknown' [-Werror=missing-prototypes]
> arch/csky/kernel/traps.c:152:15: error: no previous prototype for 'do_trap_zdiv' [-Werror=missing-prototypes]
> arch/csky/kernel/traps.c:154:15: error: no previous prototype for 'do_trap_buserr' [-Werror=missing-prototypes]
> arch/csky/kernel/traps.c:157:17: error: no previous prototype for 'do_trap_misaligned' [-Werror=missing-prototypes]
> arch/csky/kernel/traps.c:168:17: error: no previous prototype for 'do_trap_bkpt' [-Werror=missing-prototypes]
> arch/csky/kernel/traps.c:187:17: error: no previous prototype for 'do_trap_illinsn' [-Werror=missing-prototypes]
> arch/csky/kernel/traps.c:210:17: error: no previous prototype for 'do_trap_fpe' [-Werror=missing-prototypes]
> arch/csky/kernel/traps.c:220:17: error: no previous prototype for 'do_trap_priv' [-Werror=missing-prototypes]
> arch/csky/kernel/traps.c:230:17: error: no previous prototype for 'trap_c' [-Werror=missing-prototypes]
> arch/csky/kernel/traps.c:57:13: error: no previous prototype for 'trap_init' [-Werror=missing-prototypes]
> arch/csky/kernel/vdso/vgettimeofday.c:12:5: error: no previous prototype for '__vdso_clock_gettime64' [-Werror=missing-prototypes]
> arch/csky/kernel/vdso/vgettimeofday.c:18:5: error: no previous prototype for '__vdso_gettimeofday' [-Werror=missing-prototypes]
> arch/csky/kernel/vdso/vgettimeofday.c:24:5: error: no previous prototype for '__vdso_clock_getres' [-Werror=missing-prototypes]
> arch/csky/kernel/vdso/vgettimeofday.c:6:5: error: no previous prototype for '__vdso_clock_gettime' [-Werror=missing-prototypes]
> arch/csky/mm/fault.c:187:17: error: no previous prototype for 'do_page_fault' [-Werror=missing-prototypes]
> 
> Link: https://lore.kernel.org/lkml/20230810141947.1236730-17-arnd@kernel.org/
> Reported-by: Arnd Bergmann <arnd@...nel.org>
> Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
> Signed-off-by: Guo Ren <guoren@...nel.org>

I get the following build errors in linux-next. Bisect points to this patch.

Building csky:defconfig ... failed
--------------
Error log:
In file included from arch/csky/include/asm/ptrace.h:7,
                 from arch/csky/include/asm/elf.h:6,
                 from include/linux/elf.h:6,
                 from kernel/extable.c:6:
arch/csky/include/asm/traps.h:43:11: error: expected ';' before 'void'
   43 | asmlinkage void do_trap_unknown(struct pt_regs *regs);
      |           ^~~~~

[ and many more similar errors ]

Guenter

---
# bad: [56585460cc2ec44fc5d66924f0a116f57080f0dc] Add linux-next specific files for 20230830
# good: [2dde18cd1d8fac735875f2e4987f11817cc0bc2c] Linux 6.5
git bisect start 'HEAD' 'v6.5'
# bad: [17582b16f00f2ca3f84f1c9dadef1529895ddd9a] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git
git bisect bad 17582b16f00f2ca3f84f1c9dadef1529895ddd9a
# good: [bd6c11bc43c496cddfc6cf603b5d45365606dbd5] Merge tag 'net-next-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
git bisect good bd6c11bc43c496cddfc6cf603b5d45365606dbd5
# bad: [b22935905f9c5830bfd1c66ad3638ffdf6f80da7] Merge branch 'for-linux-next-fixes' of git://anongit.freedesktop.org/drm/drm-misc
git bisect bad b22935905f9c5830bfd1c66ad3638ffdf6f80da7
# good: [692f5510159c79bfa312a4e27a15e266232bfb4c] Merge tag 'asoc-v6.6' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus
git bisect good 692f5510159c79bfa312a4e27a15e266232bfb4c
# good: [b91742d84d29c39b643992b95560cfb7337eab18] mm/shmem.c: use helper macro K()
git bisect good b91742d84d29c39b643992b95560cfb7337eab18
# good: [19134bc23500a01bfdb77a804fc8e4bf8808d0cc] mm: fix kernel-doc warning from tlb_flush_rmaps()
git bisect good 19134bc23500a01bfdb77a804fc8e4bf8808d0cc
# bad: [858e6c6fd1960650c6a44b8158e1ac26ee63e26d] Merge branch 'for-curr' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc.git
git bisect bad 858e6c6fd1960650c6a44b8158e1ac26ee63e26d
# bad: [9d6b14cd1e993d2ff98df0cef6d935ce6fd4dbec] Merge tag 'flex-array-transformations-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux
git bisect bad 9d6b14cd1e993d2ff98df0cef6d935ce6fd4dbec
# good: [3b425dd2aeb8c876805a4cc29d84a6c455b43530] parisc: led: Move register_led_regions() to late_initcall()
git bisect good 3b425dd2aeb8c876805a4cc29d84a6c455b43530
# good: [48d25d382643a9d8867f8eb13af231268ab10db5] Merge tag 'parisc-for-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
git bisect good 48d25d382643a9d8867f8eb13af231268ab10db5
# bad: [c8171a86b27401aa1f492dd1f080f3102264f1ab] csky: Fixup -Wmissing-prototypes warning
git bisect bad c8171a86b27401aa1f492dd1f080f3102264f1ab
# good: [1362d15ffb59db65b2df354b548b7915686cb05c] csky: pgtable: Invalidate stale I-cache lines in update_mmu_cache
git bisect good 1362d15ffb59db65b2df354b548b7915686cb05c
# good: [c1884e1e116409dafce84df38134aa2d7cdb719d] csky: Make pfn accessors static inlines
git bisect good c1884e1e116409dafce84df38134aa2d7cdb719d
# first bad commit: [c8171a86b27401aa1f492dd1f080f3102264f1ab] csky: Fixup -Wmissing-prototypes warning