linux-kernel - Re: [PATCH RT] rtc: Disable RTC_DRV

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Message-ID: <20180726131323.ffecgeqnry6th4mp@linutronix.de>
Date:   Thu, 26 Jul 2018 15:13:23 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-rt-users@...r.kernel.org,
        Marc Zyngier <marc.zyngier@....com>,
        linux-efi <linux-efi@...r.kernel.org>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>
Subject: Re: [PATCH RT] rtc: Disable RTC_DRV_EFI on RT

On 2018-07-26 14:52:21 [+0200], Ard Biesheuvel wrote:
> We could also make it the default on -rt, but not disable it entirely, so that efi=runtime can be used to re-enable it.

Oh. I like that. We have something similar for RCU. So I would need
that:

------- >8

Subject: [PATCH] efi: Allow efi=runtime

In case the option "efi=noruntime" is default at built-time, the user
could overwrite its sate by `efi=runtime' and allow it again.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 drivers/firmware/efi/efi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 62c6e4b6ce3e..d6176ce50b45 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -110,6 +110,9 @@ static int __init parse_efi_cmdline(char *str)
 	if (parse_option_str(str, "noruntime"))
 		disable_runtime = true;
 
+	if (parse_option_str(str, "runtime"))
+		disable_runtime = false;
+
 	return 0;
 }
 early_param("efi", parse_efi_cmdline);
-- 
2.18.0