proc: fix test for "vsyscall=xonly" boot option

Booting with vsyscall=xonly results in the following vsyscall VMA:

	ffffffffff600000-ffffffffff601000 --xp ... [vsyscall]


Test does read from fixed vsyscall address to determine if kernel
supports vsyscall page but it doesn't work because, well, vsyscall
page is execute only.

Fix test by trying to execute from the first byte of the page which
contains gettimeofday() stub. This should work because vsyscall
entry points have stable addresses by design.

	Alexey, avoiding parsing .config, /proc/config.gz and
	/proc/cmdline at all costs.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Alexey Dobriyan <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions