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| Started by | "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> |
|---|---|
| First post | 2017-04-20 18:30 +0200 |
| Last post | 2017-04-20 18:30 +0200 |
| Articles | 1 — 1 participant |
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[PATCHv5 1/9] x86/asm: Fix comment in return_from_SYSCALL_64 "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2017-04-20 18:30 +0200
| From | "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> |
|---|---|
| Date | 2017-04-20 18:30 +0200 |
| Subject | [PATCHv5 1/9] x86/asm: Fix comment in return_from_SYSCALL_64 |
| Message-ID | <tyn7X-2LD-11@gated-at.bofh.it> |
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
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