linux-kernel - [GIT PULL] x86/hyperv fix for v3.15-rc1

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Message-Id: <201404111739.s3BHdRiW025864@terminus.zytor.com>
Date:	Fri, 11 Apr 2014 10:39:27 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	<stable@...r.kernel.org>, "H. Peter Anvin" <hpa@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [GIT PULL] x86/hyperv fix for v3.15-rc1

Hi Linus,

A single fix for HyperV -- we never NEED the legacy PIC on HyperV, and
in kexec/kdump scenarios we don't always know that we originally
booted EFI.  The right answer is probably to augment the legacy PIC
initialization code to detect a not-present PIC, but that is way too
high risk for right now.

The following changes since commit ca3ba2a2f4a49a308e7d78c784d51b2332064f15:

  x86, hyperv: Bypass the timer_irq_works() check (2014-03-27 11:02:45 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-hyperv-for-linus

for you to fetch changes up to 8df28b82ff0649dd293f0469b97792cfb9ed10ab:

  x86, hyperv: When on Hyper-v use NULL legacy PIC (2014-04-03 22:00:13 -0700)

----------------------------------------------------------------
K. Y. Srinivasan (1):
      x86, hyperv: When on Hyper-v use NULL legacy PIC

 arch/x86/kernel/cpu/mshyperv.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 832d05a914ba..b7d82c7e1257 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -93,14 +93,8 @@ static void __init ms_hyperv_init_platform(void)
 		printk(KERN_INFO "HyperV: LAPIC Timer Frequency: %#x\n",
 				lapic_timer_frequency);
 
-		/*
-		 * On Hyper-V, when we are booting off an EFI firmware stack,
-		 * we do not have many legacy devices including PIC, PIT etc.
-		 */
-		if (efi_enabled(EFI_BOOT)) {
-			printk(KERN_INFO "HyperV: Using null_legacy_pic\n");
-			legacy_pic = &null_legacy_pic;
-		}
+		printk(KERN_INFO "HyperV: Using null_legacy_pic\n");
+		legacy_pic = &null_legacy_pic;
 	}
 #endif
 
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