From: Steven Rostedt <rostedt@goodmis.org>
To: Nicolas Boichat <drinkcat@chromium.org>
Cc: Douglas Anderson <dianders@chromium.org>,
Guenter Roeck <groeck@chromium.org>,
Andrew Morton <akpm@linux-foundation.org>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Daniel Vetter <daniel.vetter@ffwll.ch>,
"Guilherme G. Piccoli" <gpiccoli@canonical.com>,
Kars Mulder <kerneldev@karsmulder.nl>,
Kees Cook <keescook@chromium.org>,
Masahiro Yamada <masahiroy@kernel.org>,
Michal Marek <michal.lkml@markovi.net>,
Thomas Gleixner <tglx@linutronix.de>,
Tiezhu Yang <yangtiezhu@loongson.cn>,
Will Deacon <will@kernel.org>, Yue Hu <huyue2@yulong.com>,
linux-kbuild@vger.kernel.org, lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v5] kernel/trace: Add DISALLOW_TRACE_PRINTK make option
Date: Tue, 25 Aug 2020 21:39:31 -0400 [thread overview]
Message-ID: <20200825213931.04ec7f22@oasis.local.home> (raw)
In-Reply-To: <CANMq1KCQjX1632qyo5+8kv8TXNu_Onh4gz7oMx3rx79XQX2fqg@mail.gmail.com>
On Tue, 25 Aug 2020 08:38:27 +0800
Nicolas Boichat <drinkcat@chromium.org> wrote:
> This already works. I'll be honest, I'm not 100% sure why (and if
> fully intentional)...
>
> The CFLAGS end up in 3 generated assembly files:
> # grep -R DISALLOW_TRACE_PRINTK * | grep -v ".cmd:"
> arch/x86/kernel/asm-offsets.s:# -imultiarch x86_64-linux-gnu -D
> __KERNEL__ -D DISALLOW_TRACE_PRINTK
> kernel/bounds.s:# -imultiarch x86_64-linux-gnu -D __KERNEL__ -D
> DISALLOW_TRACE_PRINTK
> scripts/mod/devicetable-offsets.s:# -D DISALLOW_TRACE_PRINTK
> (along with all *.cmd files)
>
> and I suspect some/all of those force a complete kernel rebuild.
Yeah, I believe that the modification of CFLAGS causes a recompile of
the entire kernel.
Thanks!
-- Steve
prev parent reply other threads:[~2020-08-26 1:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-24 2:59 [PATCH v5] kernel/trace: Add DISALLOW_TRACE_PRINTK make option Nicolas Boichat
2020-08-24 8:26 ` David Laight
2020-08-24 13:28 ` Steven Rostedt
2020-08-24 13:42 ` Andy Shevchenko
2020-08-24 18:26 ` Steven Rostedt
2020-08-24 13:30 ` Steven Rostedt
2020-08-25 0:38 ` Nicolas Boichat
2020-08-26 1:39 ` Steven Rostedt [this message]
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