Re: [RESEND PATCH 4.0-rc5 v19 5/6] x86/nmi: Use common printk functions

From: Borislav Petkov
Date: Tue Apr 07 2015 - 12:40:01 EST

On Tue, Apr 07, 2015 at 12:19:42PM -0400, Steven Rostedt wrote:
> Not sure what the others think, but I hate this polish notation for
> compares. One does not say "if zero does not equal
> printk_nmi_backtrace_prepare()", they say "if
> printk_nmi_backtrace_prepare() does not return zero".
> And the reason for polish notation is to prevent the:
> if (x = 0)
> mistake. Which gcc warns about anyway. Also, this doesn't even pertain
> to this code because:
> if (printk_nmi_backtrace_prepare() = 0)
> would fail to compile.

I would simply say:

err = printk_nmi_backtrace_prepare();
if (err)

like sane kernel code does.

Besides, there's not a lot of such comparisons in the kernel anyway:

$ git grep -E "if\s+\(+[0-9]+\!?=.*"
drivers/ide/au1xxx-ide.c:246: if (1==i)

but my regex doesn't cover all possible variants, just the single-line


ECO tip #101: Trim your mails when you reply.
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