* [tip:x86/urgent] Revert "x86/boot: Fail the boot if !M486 and CPUID is missing"
[not found] <82acde18a108b8e353180dd6febcc2876df33f24.1481307769.git.luto@kernel.org>
@ 2016-12-19 11:04 ` tip-bot for Andy Lutomirski
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From: tip-bot for Andy Lutomirski @ 2016-12-19 11:04 UTC (permalink / raw)
To: linux-tip-commits
Cc: jgross, gnomes, dvlasenk, hmh, peterz, brgerst, boris.ostrovsky,
hpa, linux-kernel, tedheadster, andrew.cooper3, bp, luto,
jpoimboe, tglx, Xen-devel, torvalds, mingo
Commit-ID: 426d1aff3138cf38da14e912df3c75e312f96e9e
Gitweb: http://git.kernel.org/tip/426d1aff3138cf38da14e912df3c75e312f96e9e
Author: Andy Lutomirski <luto@kernel.org>
AuthorDate: Fri, 9 Dec 2016 10:24:06 -0800
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Mon, 19 Dec 2016 11:54:20 +0100
Revert "x86/boot: Fail the boot if !M486 and CPUID is missing"
This reverts commit ed68d7e9b9cfb64f3045ffbcb108df03c09a0f98.
The patch wasn't quite correct -- there are non-Intel (and hence
non-486) CPUs that we support that don't have CPUID. Since we no
longer require CPUID for sync_core(), just revert the patch.
I think the relevant CPUs are Geode and Elan, but I'm not sure.
In principle, we should try to do better at identifying CPUID-less
CPUs in early boot, but that's more complicated.
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: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.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>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/82acde18a108b8e353180dd6febcc2876df33f24.1481307769.git.luto@kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/boot/cpu.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/arch/x86/boot/cpu.c b/arch/x86/boot/cpu.c
index 4224ede..26240dd 100644
--- a/arch/x86/boot/cpu.c
+++ b/arch/x86/boot/cpu.c
@@ -87,12 +87,6 @@ int validate_cpu(void)
return -1;
}
- if (CONFIG_X86_MINIMUM_CPU_FAMILY <= 4 && !IS_ENABLED(CONFIG_M486) &&
- !has_eflag(X86_EFLAGS_ID)) {
- printf("This kernel requires a CPU with the CPUID instruction. Build with CONFIG_M486=y to run on this CPU.\n");
- return -1;
- }
-
if (err_flags) {
puts("This kernel requires the following features "
"not present on the CPU:\n");
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