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Date: Mon, 16 Nov 2020 18:28:36 +0100 From: Thomas Gleixner <tglx@...utronix.de> To: Arnd Bergmann <arnd@...nel.org> Cc: Marc Zyngier <maz@...nel.org>, Arnd Bergmann <arnd@...db.de>, "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] irqdomain: fix -Wshadow warning On Mon, Nov 16 2020 at 16:26, Arnd Bergmann wrote: > On Mon, Nov 16, 2020 at 3:03 PM Thomas Gleixner <tglx@...utronix.de> wrote: >> So instead of trying to chase all these places we really want to rename >> the global 'nr_irqs' variable. > > Fair enough, yes. > >> Something like the uncompiled below which is purely mechanical and does >> not even try to look at some of the places which use it for the very >> wrong reasons and purpose * Shudder *. > > Looks good to me. > > If we rename it, we might want to pick an even longer name to make > it stand out in code review when it does get used, and easier to > grep for. Sure, I just picked it lazily without much thought. >> + if (msi < max_nr_irqs && irq_get_chip_data(msi) == msic) { >> generic_handle_irq(msi); >> msic->fifo_virt[idx] = cpu_to_le32(0xffffffff); >> } else { > > Most of the ones like this seem to have been simply converted from > old sanity checks using NR_IRQS and would work just as well without > the checks. Yeah. As I said I did not look closely, but the peek already told me that there is cruft. > Actually removing the checks would have a small regression > potential. Right, it shouldn't cause problems. >> --- a/drivers/pcmcia/at91_cf.c >> +++ b/drivers/pcmcia/at91_cf.c > > potential. > >> @@ -312,7 +312,7 @@ static int at91_cf_probe(struct platform >> goto fail0a; >> cf->socket.pci_irq = gpio_to_irq(board->irq_pin); >> } else >> - cf->socket.pci_irq = nr_irqs + 1; >> + cf->socket.pci_irq = max_nr_irqs + 1; >> >> /* >> * pcmcia layer only remaps "real" memory not iospace > > This one would seem to actually warrant a bugfix, setting > the field to zero. Indeed. Thanks, tglx
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