From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: 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>
Cc: Andi Kleen <ak@linux.intel.com>,
Dave Hansen <dave.hansen@intel.com>,
Andy Lutomirski <luto@amacapital.net>,
linux-arch@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCHv5 1/9] x86/asm: Fix comment in return_from_SYSCALL_64
Date: Thu, 20 Apr 2017 19:21:39 +0300 [thread overview]
Message-ID: <20170420162147.86517-2-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20170420162147.86517-1-kirill.shutemov@linux.intel.com>
On x86-64 __VIRTUAL_MASK_SHIFT depends on paging mode now.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
arch/x86/entry/entry_64.S | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 607d72c4a485..edec30584eb8 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -266,7 +266,8 @@ return_from_SYSCALL_64:
* If width of "canonical tail" ever becomes variable, this will need
* to be updated to remain correct on both old and new CPUs.
*
- * Change top 16 bits to be the sign-extension of 47th bit
+ * Change top bits to match most significant bit (47th or 56th bit
+ * depending on paging mode) in the address.
*/
shl $(64 - (__VIRTUAL_MASK_SHIFT+1)), %rcx
sar $(64 - (__VIRTUAL_MASK_SHIFT+1)), %rcx
--
2.11.0
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2017-04-20 16:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-20 16:21 [PATCHv5 0/9] x86: 5-level paging enabling for v4.12, Part 4 Kirill A. Shutemov
2017-04-20 16:21 ` Kirill A. Shutemov [this message]
2017-04-20 16:21 ` [PATCHv5 2/9] x86/boot/64: Rewrite startup_64 in C Kirill A. Shutemov
2017-04-20 16:21 ` [PATCHv5 3/9] x86/boot/64: Rename init_level4_pgt and early_level4_pgt Kirill A. Shutemov
2017-04-20 16:21 ` [PATCHv5 4/9] x86/boot/64: Add support of additional page table level during early boot Kirill A. Shutemov
2017-04-20 16:21 ` [PATCHv5 5/9] x86/mm: Add sync_global_pgds() for configuration with 5-level paging Kirill A. Shutemov
2017-04-20 16:21 ` [PATCHv5 6/9] x86/mm: Make kernel_physical_mapping_init() support " Kirill A. Shutemov
2017-04-20 16:21 ` [PATCHv5 7/9] x86/mm: Add support for 5-level paging for KASLR Kirill A. Shutemov
2017-04-20 16:21 ` [PATCHv5 8/9] x86: Enable 5-level paging support Kirill A. Shutemov
2017-04-20 16:21 ` [PATCHv5 9/9] x86/mm: Allow to have userspace mappings above 47-bits Kirill A. Shutemov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170420162147.86517-2-kirill.shutemov@linux.intel.com \
--to=kirill.shutemov@linux.intel.com \
--cc=ak@linux.intel.com \
--cc=akpm@linux-foundation.org \
--cc=dave.hansen@intel.com \
--cc=hpa@zytor.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=luto@amacapital.net \
--cc=mingo@redhat.com \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).