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Commit b8b7abae authored by Andy Lutomirski's avatar Andy Lutomirski Committed by Ingo Molnar
Browse files

x86/mm/32: Move setup_clear_cpu_cap(X86_FEATURE_PCID) earlier 



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: default avatarAndy 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: cba4671a ("x86/mm: Disable PCID on 32-bit kernels")
Link: http://lkml.kernel.org/r/b16dae9d6b0db5d9801ddbebbfd83384097c61f3.1505663533.git.luto@kernel.org


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 52a2af40

arch/x86/kernel/cpu/bugs.c

+0 −8
Original line number Diff line number Diff line
@@ -21,14 +21,6 @@ 


void __init check_bugs(void)

{

#ifdef CONFIG_X86_32

	/*

	 * Regardless of whether PCID is enumerated, the SDM says

	 * that it can't be enabled in 32-bit mode.

	 */

	setup_clear_cpu_cap(X86_FEATURE_PCID);

#endif



	identify_boot_cpu();



	if (!IS_ENABLED(CONFIG_SMP)) {

arch/x86/kernel/cpu/common.c

+8 −0
Original line number Diff line number Diff line
@@ -904,6 +904,14 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c) 


	setup_force_cpu_cap(X86_FEATURE_ALWAYS);

	fpu__init_system(c);



#ifdef CONFIG_X86_32

	/*

	 * Regardless of whether PCID is enumerated, the SDM says

	 * that it can't be enabled in 32-bit mode.

	 */

	setup_clear_cpu_cap(X86_FEATURE_PCID);

#endif

}



void __init early_cpu_init(void)