diff options
Diffstat (limited to 'debian/patches-rt/mm-protect-activate-switch-mm.patch')
| -rw-r--r-- | debian/patches-rt/mm-protect-activate-switch-mm.patch | 72 |
1 files changed, 0 insertions, 72 deletions
diff --git a/debian/patches-rt/mm-protect-activate-switch-mm.patch b/debian/patches-rt/mm-protect-activate-switch-mm.patch deleted file mode 100644 index afad8f532..000000000 --- a/debian/patches-rt/mm-protect-activate-switch-mm.patch +++ /dev/null @@ -1,72 +0,0 @@ -From: Yong Zhang <yong.zhang0@gmail.com> -Date: Tue, 15 May 2012 13:53:56 +0800 -Subject: mm: Protect activate_mm() by preempt_[disable&enable]_rt() -Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.2/older/patches-5.2.17-rt9.tar.xz - -User preempt_*_rt instead of local_irq_*_rt or otherwise there will be -warning on ARM like below: - -WARNING: at build/linux/kernel/smp.c:459 smp_call_function_many+0x98/0x264() -Modules linked in: -[<c0013bb4>] (unwind_backtrace+0x0/0xe4) from [<c001be94>] (warn_slowpath_common+0x4c/0x64) -[<c001be94>] (warn_slowpath_common+0x4c/0x64) from [<c001bec4>] (warn_slowpath_null+0x18/0x1c) -[<c001bec4>] (warn_slowpath_null+0x18/0x1c) from [<c0053ff8>](smp_call_function_many+0x98/0x264) -[<c0053ff8>] (smp_call_function_many+0x98/0x264) from [<c0054364>] (smp_call_function+0x44/0x6c) -[<c0054364>] (smp_call_function+0x44/0x6c) from [<c0017d50>] (__new_context+0xbc/0x124) -[<c0017d50>] (__new_context+0xbc/0x124) from [<c009e49c>] (flush_old_exec+0x460/0x5e4) -[<c009e49c>] (flush_old_exec+0x460/0x5e4) from [<c00d61ac>] (load_elf_binary+0x2e0/0x11ac) -[<c00d61ac>] (load_elf_binary+0x2e0/0x11ac) from [<c009d060>] (search_binary_handler+0x94/0x2a4) -[<c009d060>] (search_binary_handler+0x94/0x2a4) from [<c009e8fc>] (do_execve+0x254/0x364) -[<c009e8fc>] (do_execve+0x254/0x364) from [<c0010e84>] (sys_execve+0x34/0x54) -[<c0010e84>] (sys_execve+0x34/0x54) from [<c000da00>] (ret_fast_syscall+0x0/0x30) ----[ end trace 0000000000000002 ]--- - -The reason is that ARM need irq enabled when doing activate_mm(). -According to mm-protect-activate-switch-mm.patch, actually -preempt_[disable|enable]_rt() is sufficient. - -Inspired-by: Steven Rostedt <rostedt@goodmis.org> -Signed-off-by: Yong Zhang <yong.zhang0@gmail.com> -Cc: Steven Rostedt <rostedt@goodmis.org> -Link: http://lkml.kernel.org/r/1337061236-1766-1-git-send-email-yong.zhang0@gmail.com -Signed-off-by: Thomas Gleixner <tglx@linutronix.de> ---- - fs/exec.c | 2 ++ - mm/mmu_context.c | 2 ++ - 2 files changed, 4 insertions(+) - ---- a/fs/exec.c -+++ b/fs/exec.c -@@ -1032,12 +1032,14 @@ static int exec_mmap(struct mm_struct *m - } - } - task_lock(tsk); -+ preempt_disable_rt(); - active_mm = tsk->active_mm; - tsk->mm = mm; - tsk->active_mm = mm; - activate_mm(active_mm, mm); - tsk->mm->vmacache_seqnum = 0; - vmacache_flush(tsk); -+ preempt_enable_rt(); - task_unlock(tsk); - if (old_mm) { - up_read(&old_mm->mmap_sem); ---- a/mm/mmu_context.c -+++ b/mm/mmu_context.c -@@ -25,6 +25,7 @@ void use_mm(struct mm_struct *mm) - struct task_struct *tsk = current; - - task_lock(tsk); -+ preempt_disable_rt(); - active_mm = tsk->active_mm; - if (active_mm != mm) { - mmgrab(mm); -@@ -32,6 +33,7 @@ void use_mm(struct mm_struct *mm) - } - tsk->mm = mm; - switch_mm(active_mm, mm, tsk); -+ preempt_enable_rt(); - task_unlock(tsk); - #ifdef finish_arch_post_lock_switch - finish_arch_post_lock_switch(); |