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Subject[tip:x86/urgent] x86/process: Delete useless check for dead process with LDT
Commit-ID:  50e04acf2990d0d93983720b0a85b11ef805df60
Gitweb: https://git.kernel.org/tip/50e04acf2990d0d93983720b0a85b11ef805df60
Author: Jann Horn <jannh@google.com>
AuthorDate: Sat, 13 Jul 2019 00:41:52 +0200
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Wed, 17 Jul 2019 00:42:27 +0200

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 2684927c6b93 ("[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


---
arch/x86/kernel/process_64.c | 12 +-----------
1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 250e4c4ac6d9..af64519b2695 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -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 {
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