linux-kernel - Re: [PATCH] arm64: remove redundant 'extern'

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Message-ID: <6d90b034-b91a-4e33-b728-b86261c050b0@arm.com>
Date: Wed, 3 Apr 2024 10:58:31 +0100
From: Steven Price <steven.price@....com>
To: Mark Rutland <mark.rutland@....com>
Cc: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: remove redundant 'extern'

On 02/04/2024 11:01, Mark Rutland wrote:
> On Wed, Mar 27, 2024 at 11:24:39AM +0000, Steven Price wrote:
>> It isn't necessary to mark function definitions extern and goes against
>> the kernel coding style. Remove the redundant extern keyword.
>>
>> Signed-off-by: Steven Price <steven.price@....com>
> 
> We (unfortunately) have extern misused in a number of places:
> 
> | [mark@...rids:~/src/linux]% git grep 'extern.*(' -- arch/arm64/include | cut -d: -f 1 | uniq -c
> |      11 arch/arm64/include/asm/cacheflush.h
> |       1 arch/arm64/include/asm/checksum.h
> |       1 arch/arm64/include/asm/cpu_ops.h
> |       4 arch/arm64/include/asm/cpufeature.h
> |       2 arch/arm64/include/asm/efi.h
> |       2 arch/arm64/include/asm/elf.h
> |       1 arch/arm64/include/asm/exec.h
> |       1 arch/arm64/include/asm/fixmap.h
> |      48 arch/arm64/include/asm/fpsimd.h
> |       3 arch/arm64/include/asm/ftrace.h
> |      10 arch/arm64/include/asm/hugetlb.h
> |      11 arch/arm64/include/asm/hw_breakpoint.h
> |       6 arch/arm64/include/asm/io.h
> |       4 arch/arm64/include/asm/kexec.h
> |       1 arch/arm64/include/asm/kgdb.h
> |      16 arch/arm64/include/asm/kvm_asm.h
> |       3 arch/arm64/include/asm/kvm_host.h
> |      11 arch/arm64/include/asm/kvm_hyp.h
> |       2 arch/arm64/include/asm/kvm_pkvm.h
> |       2 arch/arm64/include/asm/memory.h
> |       8 arch/arm64/include/asm/mmu.h
> |       2 arch/arm64/include/asm/page.h
> |       1 arch/arm64/include/asm/percpu.h
> |       2 arch/arm64/include/asm/perf_event.h
> |       2 arch/arm64/include/asm/pgalloc.h
> |      18 arch/arm64/include/asm/pgtable.h
> |       3 arch/arm64/include/asm/pointer_auth.h
> |       3 arch/arm64/include/asm/proc-fns.h
> |       2 arch/arm64/include/asm/processor.h
> |       3 arch/arm64/include/asm/ptrace.h
> |      12 arch/arm64/include/asm/smp.h
> |       1 arch/arm64/include/asm/stacktrace.h
> |      14 arch/arm64/include/asm/string.h
> |       2 arch/arm64/include/asm/suspend.h
> |       1 arch/arm64/include/asm/system_misc.h
> |       6 arch/arm64/include/asm/uaccess.h
> 
> ... so it'd probably be best to make the commit title more specific to this
> instance, and maybe go clean those up in bulk as a series to avoid a steady
> stream of copycat patches.

Ah, I hadn't gone looking that closely - I'll do a series updating the
arch/arm64/include ones (thanks for the list ;) ), and I'll include an
updated version of this patch, with a clearly commit title, in the series.

Thanks,

Steve

> Mark.
> 
>> ---
>>  arch/arm64/include/asm/fixmap.h | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h
>> index 87e307804b99..75b22b89db1a 100644
>> --- a/arch/arm64/include/asm/fixmap.h
>> +++ b/arch/arm64/include/asm/fixmap.h
>> @@ -107,7 +107,7 @@ void __init early_fixmap_init(void);
>>  #define __late_set_fixmap __set_fixmap
>>  #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
>>  
>> -extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
>> +void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
>>  
>>  #include <asm-generic/fixmap.h>
>>  
>> -- 
>> 2.34.1
>>
>>