exit/doublefault: Remove apparently bogus comment about rewind_stack_do_exit

I do not see panic calling rewind_stack_do_exit anywhere, nor can I
find anywhere in the history where doublefault_shim has called
rewind_stack_do_exit.  So I don't think this comment was ever actually
correct.

Cc: Andy Lutomirski <luto@kernel.org>
Fixes: 7d8d8cfdee9a ("x86/doublefault/32: Rewrite the x86_32 #DF handler and unify with 64-bit")
Link: https://lkml.kernel.org/r/20211020174406.17889-1-ebiederm@xmission.com
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

diff --git a/arch/x86/kernel/doublefault_32.c b/arch/x86/kernel/doublefault_32.c
index d1d49e3d536b84f1c4b7a75f8c7aeb2d365c6121..3b58d8703094f54b078063ff92a0cff405052aab 100644 (file)
--- a/arch/x86/kernel/doublefault_32.c
+++ b/arch/x86/kernel/doublefault_32.c
@@ -77,9 +77,6 @@ asmlinkage noinstr void __noreturn doublefault_shim(void)
         * some way to reconstruct CR3.  We could make a credible guess based
         * on cpu_tlbstate, but that would be racy and would not account for
         * PTI.
-        *
-        * Instead, don't bother.  We can return through
-        * rewind_stack_do_exit() instead.
         */
        panic("cannot return from double fault\n");
 }