From: Linus Torvalds <torvalds@linux-foundation.org>
To: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>,
Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
Hans de Goede <hdegoede@redhat.com>,
Mark Gross <markgross@kernel.org>,
ibm-acpi-devel@lists.sourceforge.net,
platform-driver-x86@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
llvm@lists.linux.dev, Tor Vic <torvic9@mailbox.org>
Subject: Re: [PATCH] platform/x86: thinkpad_acpi: Fix bitwise vs. logical warning
Date: Mon, 18 Oct 2021 20:27:02 -1000 [thread overview]
Message-ID: <CAHk-=wi-UJAGo6uwYx8XKydSEsnQ33mW4t+kUnb+CNY+Oxobjg@mail.gmail.com> (raw)
In-Reply-To: <YW5Q253s0Y+zYxdi@archlinux-ax161>
On Mon, Oct 18, 2021 at 7:00 PM Nathan Chancellor <nathan@kernel.org> wrote:
>
> For what it's worth, the suggested fix is the '||' underneath the
> warning text:
>
> In file included from arch/x86/kvm/mmu/tdp_iter.c:5:
> arch/x86/kvm/mmu/spte.h:318:9: error: use of bitwise '|' with boolean operands [-Werror,-Wbitwise-instead-of-logical]
> return __is_bad_mt_xwr(rsvd_check, spte) |
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ||
> arch/x86/kvm/mmu/spte.h:318:9: note: cast one or both operands to int to silence this warning
> 1 error generated.
Hmm. That's not at all obvious.
The *much* bigger part is that
note: cast one or both operands to int to silence this warning
which is what I'm complaining about. That note should die. It should
say "maybe you meant to use a logical or" or something like that.
> Perhaps that hint should also be added to the warning text, like:
>
> In file included from arch/x86/kvm/mmu/tdp_iter.c:5:
> arch/x86/kvm/mmu/spte.h:318:9: error: use of bitwise '|' with boolean operands; did you mean logical '||'? [-Werror,-Wbitwise-instead-of-logical]
> return __is_bad_mt_xwr(rsvd_check, spte) |
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ||
> arch/x86/kvm/mmu/spte.h:318:9: note: cast one or both operands to int to silence this warning
I don't understand why you seem to continue to ignore the "note"
message, which makes a completely crazy suggestion.
Linus
next prev parent reply other threads:[~2021-10-19 6:27 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-18 18:25 [PATCH] platform/x86: thinkpad_acpi: Fix bitwise vs. logical warning Nathan Chancellor
2021-10-18 18:34 ` Nick Desaulniers
2021-10-18 19:41 ` Linus Torvalds
2021-10-18 20:14 ` Nick Desaulniers
2021-10-19 3:38 ` Linus Torvalds
2021-10-19 5:00 ` Nathan Chancellor
2021-10-19 6:27 ` Linus Torvalds [this message]
2021-10-19 17:35 ` Nathan Chancellor
2021-10-19 15:20 ` Hans de Goede
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