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Date:   Wed, 10 Feb 2021 00:43:41 +0100
From:   Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kw@linux.com>
To:     Bjorn Helgaas <helgaas@kernel.org>
Cc:     Yicong Yang <yangyicong@hisilicon.com>, linux-pci@vger.kernel.org,
        prime.zeng@huawei.com, linuxarm@openeuler.org,
        Masahiro Yamada <masahiroy@kernel.org>,
        Michal Marek <michal.lkml@markovi.net>,
        linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] PCI: Use subdir-ccflags-* to inherit debug flag
Message-ID: <YCMeLS1Vd2YQuWmQ@rocinante>
References: <1612438215-33105-1-git-send-email-yangyicong@hisilicon.com>
 <20210209212510.GA513360@bjorn-Precision-5520>
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In-Reply-To: <20210209212510.GA513360@bjorn-Precision-5520>
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Hi Bjorn,

Thank you!  This looks great!

[...]
> commit e8e9aababe60 ("PCI: Apply CONFIG_PCI_DEBUG to entire drivers/pci hierarchy")
> Author: Junhao He <hejunhao2@hisilicon.com>
> Date:   Thu Feb 4 19:30:15 2021 +0800
> 
>     PCI: Apply CONFIG_PCI_DEBUG to entire drivers/pci hierarchy
>     
>     CONFIG_PCI_DEBUG=y adds -DDEBUG to CFLAGS, which enables things like
>     pr_debug() and dev_dbg() (and hence pci_dbg()).  Previously we added
>     -DDEBUG for files in drivers/pci/, but not files in subdirectories of
>     drivers/pci/.
>     
>     Add -DDEBUG to CFLAGS for all files below drivers/pci/ so CONFIG_PCI_DEBUG
>     applies to the entire hierarchy.
>     
>     [bhelgaas: commit log]
>     Link: https://lore.kernel.org/r/1612438215-33105-1-git-send-email-yangyicong@hisilicon.com
>     Signed-off-by: Junhao He <hejunhao2@hisilicon.com>
>     Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
>     Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
>     Reviewed-by: Krzysztof Wilczyński <kw@linux.com>
> 
> diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
> index 11cc79411e2d..d62c4ac4ae1b 100644
> --- a/drivers/pci/Makefile
> +++ b/drivers/pci/Makefile
> @@ -36,4 +36,4 @@ obj-$(CONFIG_PCI_ENDPOINT)	+= endpoint/
>  obj-y				+= controller/
>  obj-y				+= switch/
>  
> -ccflags-$(CONFIG_PCI_DEBUG) := -DDEBUG
> +subdir-ccflags-$(CONFIG_PCI_DEBUG) := -DDEBUG

And thank you again, Yicong, for fixing this.  Much appreciated.

Krzysztof