diff options
| author | Roland McGrath <roland@redhat.com> | 2007-07-20 03:31:43 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-20 11:44:19 -0400 |
| commit | d2eea68e7db759ce67807b42b7407236cccfde71 (patch) | |
| tree | 41521fcbce645a492c83e45b4b73be829a4cc8b1 /arch/i386/xen/vdso.h | |
| parent | 5ac12c6fe1b5fbda0d0caedb8214cde545a5737c (diff) | |
xen: disable vdso "nosegneg" on native boot
One of the nice ideas behind paravirt is that CONFIG_XEN=y can be included
in a standard configuration and be no worse for native booting than as a
Xen guest. The glibc feature that supports the vDSO "nosegneg" note is
designed specifically to make this easy. You just have to flip one bit at
boot time. This patch makes Xen flip the bit, so a CONFIG_XEN=y kernel on
bare hardware does not make glibc use the less-optimized library builds.
Signed-off-by: Roland McGrath <roland@redhat.com>
Acked-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/i386/xen/vdso.h')
| -rw-r--r-- | arch/i386/xen/vdso.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/i386/xen/vdso.h b/arch/i386/xen/vdso.h new file mode 100644 index 000000000000..861fedfe5230 --- /dev/null +++ b/arch/i386/xen/vdso.h | |||
| @@ -0,0 +1,4 @@ | |||
| 1 | /* Bit used for the pseudo-hwcap for non-negative segments. We use | ||
| 2 | bit 1 to avoid bugs in some versions of glibc when bit 0 is | ||
| 3 | used; the choice is otherwise arbitrary. */ | ||
| 4 | #define VDSO_NOTE_NONEGSEG_BIT 1 | ||