linux-kernel - Re: x86/MCE: drop bogus const modifier from AMD's bank4

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Message-ID: <m9tnue$fiu$1@ger.gmane.org>
Date:	Fri, 23 Jan 2015 16:04:46 +0100
From:	"U.Mutlu" <for-gmane@...luit.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: x86/MCE: drop bogus const modifier from AMD's bank4_names()

Jan Beulich wrote, On 01/23/2015 09:32 AM:
>
> -static const char * const bank4_names(struct threshold_block *b)
> +static const char *bank4_names(const struct threshold_block *b)

There is a big difference in the return type, cf. below.
Of course, if possible, the more const the better.

Borislav Petkov wrote, On 01/23/2015 11:16 AM:
> On Fri, Jan 23, 2015 at 10:05:40AM +0000, Jan Beulich wrote:
>> It's been a long while ago that I noticed and fixed the warning, so
>> I don't recall the details. What I do know is that I didn't force any
>> extra flags, and that a similar issue elsewhere in the tree (fixed
>> in 3.19-rc5) triggered the same warning in at least one of my builds
>> (again without any extra warning options) in -rc4.
>
> Older compiler maybe. Not that it is worth wasting too much time on it
> though...

int main()
  {
    char mem1[] = "foo";
    char mem2[] = "bar";

    const char* const p1 = mem1;   // both ptr and content are const
    const char*       p2 = mem2;   // content is const, but not the ptr

// ++p1;         // not possible b/c p1 is const
    ++p2;         // possible b/c p2 is not const

// *p1 = 'X';    // not possible b/c content of p1 is const
// *p2 = 'A';    // not possible b/c content of p2 is const

    return 0;
  }


cu
Uenal

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