Messages in this thread | | | Subject | Re: [PATCH 34/34] x86/mm/pti: Add Warning when booting on a PCIE capable CPU | From | Waiman Long <> | Date | Mon, 5 Mar 2018 08:39:28 -0500 |
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On 03/05/2018 05:26 AM, Joerg Roedel wrote: > From: Joerg Roedel <jroedel@suse.de> > > Warn the user in case the performance can be significantly > improved by switching to a 64-bit kernel. > > Suggested-by: Andy Lutomirski <luto@kernel.org> > Signed-off-by: Joerg Roedel <jroedel@suse.de> > --- > arch/x86/mm/pti.c | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c > index 3ffd923..8f5aa0d 100644 > --- a/arch/x86/mm/pti.c > +++ b/arch/x86/mm/pti.c > @@ -385,6 +385,22 @@ void __init pti_init(void) > > pr_info("enabled\n"); > > +#ifdef CONFIG_X86_32 > + if (boot_cpu_has(X86_FEATURE_PCID)) { > + /* Use printk to work around pr_fmt() */ > + printk(KERN_WARNING "\n"); > + printk(KERN_WARNING "************************************************************\n"); > + printk(KERN_WARNING "** WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! **\n"); > + printk(KERN_WARNING "** **\n"); > + printk(KERN_WARNING "** You are using 32-bit PTI on a 64-bit PCID-capable CPU. **\n"); > + printk(KERN_WARNING "** Your performance will increase dramatically if you **\n"); > + printk(KERN_WARNING "** switch to a 64-bit kernel! **\n"); > + printk(KERN_WARNING "** **\n"); > + printk(KERN_WARNING "** WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! **\n"); > + printk(KERN_WARNING "************************************************************\n"); > + } > +#endif > + > pti_clone_user_shared(); > pti_clone_entry_text(); > pti_setup_espfix64();
Typo in the patch title: PCIE => PCID.
-Longman
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