diff options
| author | Roland McGrath <roland@redhat.com> | 2008-01-30 13:30:43 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:30:43 +0100 |
| commit | af65d64845a90c8f2fc90b97e2148ff74672e979 (patch) | |
| tree | e70a57a9635acaf8154c150f95e11dcb51937fd8 /arch/x86/Kconfig | |
| parent | 00f8b1bc0e44ba94fb33e1fbd8ac82841d7cc570 (diff) | |
x86 vDSO: consolidate vdso32
This makes x86_64's ia32 emulation support share the sources used in the
32-bit kernel for the 32-bit vDSO and much of its setup code.
The 32-bit vDSO mapping now behaves the same on x86_64 as on native 32-bit.
The abi.syscall32 sysctl on x86_64 now takes the same values that
vm.vdso_enabled takes on the 32-bit kernel. That is, 1 means a randomized
vDSO location, 2 means the fixed old address. The CONFIG_COMPAT_VDSO
option is now available to make this the default setting, the same meaning
it has for the 32-bit kernel. (This does not affect the 64-bit vDSO.)
The argument vdso32=[012] can be used on both 32-bit and 64-bit kernels to
set this paramter at boot time. The vdso=[012] argument still does this
same thing on the 32-bit kernel.
Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 80b7ba4056d..2f4d88babd3 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1191,9 +1191,9 @@ config HOTPLUG_CPU config COMPAT_VDSO bool "Compat VDSO support" default y - depends on X86_32 + depends on X86_32 || IA32_EMULATION help - Map the VDSO to the predictable old-style address too. + Map the 32-bit VDSO to the predictable old-style address too. ---help--- Say N here if you are running a sufficiently recent glibc version (2.3.3 or later), to remove the high-mapped |