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From: tip-bot for Andy Lutomirski <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: boris.ostrovsky@oracle.com, jgross@suse.com,
	peterz@infradead.org, mingo@kernel.org, bp@alien8.de,
	tglx@linutronix.de, luto@kernel.org, Xen-devel@lists.xen.org,
	hmh@hmh.eng.br, andrew.cooper3@citrix.com,
	linux-kernel@vger.kernel.org, hpa@zytor.com,
	gnomes@lxorguk.ukuu.org.uk, tedheadster@gmail.com,
	brgerst@gmail.com
Subject: [tip:x86/urgent] x86/asm/32: Make sync_core() handle missing CPUID on all 32-bit kernels
Date: Mon, 19 Dec 2016 03:03:53 -0800	[thread overview]
Message-ID: <tip-1c52d859cb2d417e7216d3e56bb7fea88444cec9@git.kernel.org> (raw)
In-Reply-To: <685bd083a7c036f7769510b6846315b17d6ba71f.1481307769.git.luto@kernel.org>

Commit-ID:  1c52d859cb2d417e7216d3e56bb7fea88444cec9
Gitweb:     http://git.kernel.org/tip/1c52d859cb2d417e7216d3e56bb7fea88444cec9
Author:     Andy Lutomirski <luto@kernel.org>
AuthorDate: Fri, 9 Dec 2016 10:24:05 -0800
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Mon, 19 Dec 2016 11:54:20 +0100

x86/asm/32: Make sync_core() handle missing CPUID on all 32-bit kernels

We support various non-Intel CPUs that don't have the CPUID
instruction, so the M486 test was wrong.  For now, fix it with a big
hammer: handle missing CPUID on all 32-bit CPUs.

Reported-by: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Matthew Whitehead <tedheadster@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: xen-devel <Xen-devel@lists.xen.org>
Link: http://lkml.kernel.org/r/685bd083a7c036f7769510b6846315b17d6ba71f.1481307769.git.luto@kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
 arch/x86/include/asm/processor.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 6aa741f..b934871 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -607,7 +607,7 @@ static inline void sync_core(void)
 {
 	int tmp;
 
-#ifdef CONFIG_M486
+#ifdef CONFIG_X86_32
 	/*
 	 * Do a CPUID if available, otherwise do a jump.  The jump
 	 * can conveniently enough be the jump around CPUID.

  reply	other threads:[~2016-12-19 11:07 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-09 18:24 [PATCH v4 0/4] CPUID-less CPU/sync_core fixes and improvements Andy Lutomirski
2016-12-09 18:24 ` [PATCH v4 1/4] x86/asm/32: Make sync_core() handle missing CPUID on all 32-bit kernels Andy Lutomirski
2016-12-19 11:03   ` tip-bot for Andy Lutomirski [this message]
2016-12-19 11:03   ` [tip:x86/urgent] " tip-bot for Andy Lutomirski
2016-12-09 18:24 ` [PATCH v4 1/4] " Andy Lutomirski
2016-12-09 18:24 ` [PATCH v4 2/4] Revert "x86/boot: Fail the boot if !M486 and CPUID is missing" Andy Lutomirski
2016-12-09 18:24 ` Andy Lutomirski
2016-12-19 11:04   ` [tip:x86/urgent] " tip-bot for Andy Lutomirski
2016-12-19 11:04   ` tip-bot for Andy Lutomirski
2016-12-09 18:24 ` [PATCH v4 3/4] x86/microcode/intel: Replace sync_core() with native_cpuid() Andy Lutomirski
2016-12-19 11:05   ` [tip:x86/urgent] " tip-bot for Andy Lutomirski
2016-12-19 11:05   ` tip-bot for Andy Lutomirski
2016-12-09 18:24 ` [PATCH v4 3/4] " Andy Lutomirski
2016-12-09 18:24 ` [PATCH v4 4/4] x86/asm: Rewrite sync_core() to use IRET-to-self Andy Lutomirski
2016-12-09 18:24 ` Andy Lutomirski
2016-12-19 11:05   ` [tip:x86/urgent] " tip-bot for Andy Lutomirski
2016-12-19 11:05   ` tip-bot for Andy Lutomirski
2016-12-15 18:06 ` [PATCH v4 0/4] CPUID-less CPU/sync_core fixes and improvements Andy Lutomirski
2016-12-15 18:06 ` Andy Lutomirski

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