linux-kernel - Re: [PATCH] riscv: Add header include guards to insn.h

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Date:   Wed, 1 Feb 2023 17:37:24 +0800
From:   "liaochang (A)" <liaochang1@...wei.com>
To:     Conor Dooley <conor.dooley@...rochip.com>
CC:     <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <aou@...s.berkeley.edu>, <heiko.stuebner@...ll.eu>,
        <ajones@...tanamicro.com>,
        <prabhakar.mahadev-lad.rj@...renesas.com>, <jszhang@...nel.org>,
        <vincent.chen@...ive.com>, <linux-riscv@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] riscv: Add header include guards to insn.h

Hi, Conor

在 2023/1/30 22:53, Conor Dooley 写道:
> Hey!
> 
> On Sun, Jan 29, 2023 at 05:42:42PM +0800, Liao Chang wrote:
>> Add header include guards to insn.h to prevent repeating declaration of
>> any identifiers in insn.h.
> 
> I'm curious, did you spot this "by hand" while doing other work, or do
> you have a tool that found it for you?

I found this "by hand", inspired by scripts/checkdeclares.pl, i write a tiny tool
to analyse the missing header guards in header file.

#!/usr/bin/env perl
use strict;

sub usage {
        print "Usage: checkguards.pl file1.h ...\n";
        print "Warn of missing header guards\n";
        exit 1;
}

if ($#ARGV < 0) {
        usage();
}

foreach my $file (@ARGV) {
        open(my $f, '<', $file)
            or die "Cannot open $file: $!.\n";

        my $scan_area = 1;
        my $guards_warn = 0;

        # The lines of header file are divided into several areas as follows:
        #
        # ... area1 ...
        # #ifndef _HEADER_GUARD
        # ... area2 ...
        # #define _HEADER_GUARD
        # ... area3 ...
        # #endif /* _HEADER_GUARD */
        # ... area4 ...
        # EOF
        #
        # If any statement is found in area1, area2, and area4, it
        # throws a warning of illegal usage of header guard usage.
        while (<$f>) {
                if (m/^(.*);\s*$/o) {
                        if ($scan_area == 1 || $scan_area == 2 || $scan_area == 4) {
                                ++$guards_warn;
                        }
                } elsif (m/^\s*(#ifndef\s+)[a-zA-Z0-9_]*_H[_]*\s*$/o) {
                        ++$scan_area;
                } elsif (m/^\s*(#define\s+)[a-zA-Z0-9_]*_H[_]*\s*$/o) {
                        ++$scan_area;
                } elsif (m/^\s*(#endif)\s*\/\*\s*[a-zA-Z0-9_]*_H[_]*\s*\*\/\s*$/o) {
                        ++$scan_area;
                }
        }

        close($f);

        if ($guards_warn) {
                print "Illegal usage of header guard found in $file.\n";
        }
}

Thanks.

> 
>> Fixes: edde5584c7ab ("riscv: Add SW single-step support for KDB")
> 
> Heh, I appreciate you going back to the file's original name to find the
> correct fixes tag!
> I figure that it's probably worth adding a fixes tag for the rename too,
> so that the stable bots don't get confused? That would be:
> Fixes: c9c1af3f186a ("RISC-V: rename parse_asm.h to insn.h")
> 
> Probably overkill when you have Drew's already for something so trivial,
> but:
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> 
>> Signed-off-by: Liao Chang <liaochang1@...wei.com>
>> ---
>>  arch/riscv/include/asm/insn.h | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/arch/riscv/include/asm/insn.h b/arch/riscv/include/asm/insn.h
>> index 25ef9c0b19e7..22c7613bfda3 100644
>> --- a/arch/riscv/include/asm/insn.h
>> +++ b/arch/riscv/include/asm/insn.h
>> @@ -3,6 +3,9 @@
>>   * Copyright (C) 2020 SiFive
>>   */
>>  
>> +#ifndef _ASM_RISCV_INSN_H
>> +#define _ASM_RISCV_INSN_H
>> +
>>  #include <linux/bits.h>
>>  
>>  #define RV_INSN_FUNCT3_MASK	GENMASK(14, 12)
>> @@ -365,3 +368,4 @@ static inline void riscv_insn_insert_utype_itype_imm(u32 *utype_insn, u32 *itype
>>  	*utype_insn |= (imm & RV_U_IMM_31_12_MASK) + ((imm & BIT(11)) << 1);
>>  	*itype_insn |= ((imm & RV_I_IMM_11_0_MASK) << RV_I_IMM_11_0_OPOFF);
>>  }
>> +#endif /* _ASM_RISCV_INSN_H */
>> -- 
>> 2.25.1
>>
>>

-- 
BR,
Liao, Chang