x86/entry/32: Clear the CS high bits

Even if not on an entry stack, the CS's high bits must be
initialized because they are unconditionally evaluated in
PARANOID_EXIT_TO_KERNEL_MODE.

Failing to do so broke the boot on Galileo Gen2 and IOT2000 boards.

 [ bp: Make the commit message tone passive and impartial. ]

Fixes: b92a165df17e ("x86/entry/32: Handle Entry from Kernel-Mode on Entry-Stack")
Signed-off-by: Jan Kiszka <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Reviewed-by: Joerg Roedel <[email protected]>
Acked-by: Joerg Roedel <[email protected]>
CC: "H. Peter Anvin" <[email protected]>
CC: Andrea Arcangeli <[email protected]>
CC: Andy Lutomirski <[email protected]>
CC: Boris Ostrovsky <[email protected]>
CC: Brian Gerst <[email protected]>
CC: Dave Hansen <[email protected]>
CC: David Laight <[email protected]>
CC: Denys Vlasenko <[email protected]>
CC: Eduardo Valentin <[email protected]>
CC: Greg KH <[email protected]>
CC: Ingo Molnar <[email protected]>
CC: Jiri Kosina <[email protected]>
CC: Josh Poimboeuf <[email protected]>
CC: Juergen Gross <[email protected]>
CC: Linus Torvalds <[email protected]>
CC: Peter Zijlstra <[email protected]>
CC: Thomas Gleixner <[email protected]>
CC: Will Deacon <[email protected]>
CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: linux-mm <[email protected]>
CC: x86-ml <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

0 files changed, 0 insertions, 0 deletions