diff options
| author | Kirill A. Shutemov <[email protected]> | 2017-03-30 11:07:26 +0300 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2017-04-04 08:22:33 +0200 |
| commit | 361b4b58ec4cf123e12a773909c6454dbd5e6dbc (patch) | |
| tree | 6d03e4d551f83536ba2c7641485f84a912941267 | |
| parent | 3677d4c6a2010e4f5a0ca8b617b595fe4cc7ba6b (diff) | |
x86/asm: Remove __VIRTUAL_MASK_SHIFT==47 assert
We don't need the assert anymore, as:
17be0aec74fb ("x86/asm/entry/64: Implement better check for canonical addresses")
made canonical address checks generic wrt. address width.
Signed-off-by: Kirill A. Shutemov <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
| -rw-r--r-- | arch/x86/entry/entry_64.S | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 044d18ebc43c..f07b4efb34d5 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -265,12 +265,9 @@ 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 */ - .ifne __VIRTUAL_MASK_SHIFT - 47 - .error "virtual address width changed -- SYSRET checks need update" - .endif - - /* Change top 16 bits to be the sign-extension of 47th bit */ shl $(64 - (__VIRTUAL_MASK_SHIFT+1)), %rcx sar $(64 - (__VIRTUAL_MASK_SHIFT+1)), %rcx |