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x86/process: Delete useless check for dead process with LDT 

At release_thread(), ->mm is NULL; and it is fine for the former mm to
still have an LDT. Delete this check in process_64.c, similar to
commit 2684927c6b ("[PATCH] x86: Deprecate useless bug"), which did the
same in process_32.c.

Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190712224152.13129-1-jannh@google.com
This commit is contained in:
Jann Horn 2019-07-13 00:41:52 +02:00 committed by Thomas Gleixner
parent 29e7e9664a
commit 50e04acf29
1 changed files with 1 additions and 11 deletions
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12
arch/x86/kernel/process_64.c
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@ -143,17 +143,7 @@ void __show_regs(struct pt_regs *regs, enum show_regs_mode mode)
void release_thread(struct task_struct *dead_task)
{
if (dead_task->mm) {
#ifdef CONFIG_MODIFY_LDT_SYSCALL
if (dead_task->mm->context.ldt) {
pr_warn("WARNING: dead process %s still has LDT? <%p/%d>\n",
dead_task->comm,
dead_task->mm->context.ldt->entries,
dead_task->mm->context.ldt->nr_entries);
BUG();
}
#endif
}
WARN_ON(dead_task->mm);
}
enum which_selector {