From: Andi Kleen <ak@linux.intel.com>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Dave Hansen <dave.hansen@intel.com>,
Andy Lutomirski <luto@amacapital.net>,
Michal Hocko <mhocko@kernel.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCHv3 13/13] x86/mm: Offset boot-time paging mode switching cost
Date: Mon, 7 Aug 2017 08:54:45 -0700 [thread overview]
Message-ID: <20170807155445.GG3946@tassilo.jf.intel.com> (raw)
In-Reply-To: <20170807141451.80934-14-kirill.shutemov@linux.intel.com>
> diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
> index 077e8b45784c..6f92e61d35ac 100644
> --- a/arch/x86/entry/entry_64.S
> +++ b/arch/x86/entry/entry_64.S
> @@ -274,7 +274,7 @@ return_from_SYSCALL_64:
> * depending on paging mode) in the address.
> */
> #ifdef CONFIG_X86_5LEVEL
> - testl $1, p4d_folded(%rip)
> + testl $1, __p4d_folded(%rip)
> jnz 1f
You can use
ALTERNATIVE "", "jmp 1f", X86_FEATURE_LA57
to do the patching.
-Andi
prev parent reply other threads:[~2017-08-07 15:54 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-07 14:14 [PATCHv3 00/13] Boot-time switching between 4- and 5-level paging Kirill A. Shutemov
2017-08-07 14:14 ` [PATCHv3 01/13] mm, sparsemem: Allocate mem_section at runtime for SPARSEMEM_EXTREME Kirill A. Shutemov
2017-08-07 14:14 ` [PATCHv3 02/13] x86/kasan: Use the same shadow offset for 4- and 5-level paging Kirill A. Shutemov
2017-08-07 14:14 ` [PATCHv3 03/13] x86/xen: Provide pre-built page tables only for XEN_PV and XEN_PVH Kirill A. Shutemov
2017-08-07 14:14 ` [PATCHv3 04/13] x86/xen: Drop 5-level paging support code from XEN_PV code Kirill A. Shutemov
2017-08-07 14:14 ` [PATCHv3 05/13] x86/boot/compressed/64: Detect and handle 5-level paging at boot-time Kirill A. Shutemov
2017-08-07 14:14 ` [PATCHv3 06/13] x86/mm: Make virtual memory layout movable for CONFIG_X86_5LEVEL Kirill A. Shutemov
2017-08-07 14:14 ` [PATCHv3 07/13] x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D variable Kirill A. Shutemov
2017-08-07 15:48 ` Andi Kleen
2017-08-07 14:14 ` [PATCHv3 08/13] x86/mm: Handle boot-time paging mode switching at early boot Kirill A. Shutemov
2017-08-07 14:14 ` [PATCHv3 09/13] x86/mm: Fold p4d page table layer at runtime Kirill A. Shutemov
2017-08-07 14:14 ` [PATCHv3 10/13] x86/mm: Replace compile-time checks for 5-level with runtime-time Kirill A. Shutemov
2017-08-07 14:14 ` [PATCHv3 11/13] x86/mm: Allow to boot without la57 if CONFIG_X86_5LEVEL=y Kirill A. Shutemov
2017-08-07 14:14 ` [PATCHv3 12/13] x86/xen: Allow XEN_PV and XEN_PVH to be enabled with X86_5LEVEL Kirill A. Shutemov
2017-08-07 14:14 ` [PATCHv3 13/13] x86/mm: Offset boot-time paging mode switching cost Kirill A. Shutemov
2017-08-07 15:54 ` Andi Kleen [this message]
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