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b8b7abaed7
Otherwise we might have the PCID feature bit set during cpu_init().
This is just for robustness. I haven't seen any actual bugs here.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: cba4671af7 ("x86/mm: Disable PCID on 32-bit kernels")
Link: http://lkml.kernel.org/r/b16dae9d6b0db5d9801ddbebbfd83384097c61f3.1505663533.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/*
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* Copyright (C) 1994 Linus Torvalds
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*
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* Cyrix stuff, June 1998 by:
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* - Rafael R. Reilova (moved everything from head.S),
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* <rreilova@ececs.uc.edu>
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* - Channing Corn (tests & fixes),
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* - Andrew D. Balsa (code cleanup).
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*/
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#include <linux/init.h>
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#include <linux/utsname.h>
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#include <asm/bugs.h>
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#include <asm/processor.h>
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#include <asm/processor-flags.h>
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#include <asm/fpu/internal.h>
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#include <asm/msr.h>
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#include <asm/paravirt.h>
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#include <asm/alternative.h>
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#include <asm/pgtable.h>
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#include <asm/set_memory.h>
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void __init check_bugs(void)
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{
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identify_boot_cpu();
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if (!IS_ENABLED(CONFIG_SMP)) {
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pr_info("CPU: ");
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print_cpu_info(&boot_cpu_data);
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}
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#ifdef CONFIG_X86_32
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/*
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* Check whether we are able to run this kernel safely on SMP.
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*
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* - i386 is no longer supported.
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* - In order to run on anything without a TSC, we need to be
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* compiled for a i486.
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*/
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if (boot_cpu_data.x86 < 4)
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panic("Kernel requires i486+ for 'invlpg' and other features");
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init_utsname()->machine[1] =
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'0' + (boot_cpu_data.x86 > 6 ? 6 : boot_cpu_data.x86);
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alternative_instructions();
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fpu__init_check_bugs();
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#else /* CONFIG_X86_64 */
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alternative_instructions();
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/*
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* Make sure the first 2MB area is not mapped by huge pages
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* There are typically fixed size MTRRs in there and overlapping
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* MTRRs into large pages causes slow downs.
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*
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* Right now we don't do that with gbpages because there seems
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* very little benefit for that case.
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*/
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if (!direct_gbpages)
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set_memory_4k((unsigned long)__va(0), 1);
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#endif
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}
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