parisc: fix warning in flush_tlb_all

I've got the following splat after enabling preemption:

[    3.724721] BUG: using __this_cpu_add() in preemptible [00000000] code: swapper/0/1
[    3.734630] caller is __this_cpu_preempt_check+0x38/0x50
[    3.740635] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.15.0-rc4-64bit+ #324
[    3.744605] Hardware name: 9000/785/C8000
[    3.744605] Backtrace:
[    3.744605]  [<00000000401d9d58>] show_stack+0x74/0xb0
[    3.744605]  [<0000000040c27bd4>] dump_stack_lvl+0x10c/0x188
[    3.744605]  [<0000000040c27c84>] dump_stack+0x34/0x48
[    3.744605]  [<0000000040c33438>] check_preemption_disabled+0x178/0x1b0
[    3.744605]  [<0000000040c334f8>] __this_cpu_preempt_check+0x38/0x50
[    3.744605]  [<00000000401d632c>] flush_tlb_all+0x58/0x2e0
[    3.744605]  [<00000000401075c0>] 0x401075c0
[    3.744605]  [<000000004010b8fc>] 0x4010b8fc
[    3.744605]  [<00000000401080fc>] 0x401080fc
[    3.744605]  [<00000000401d5224>] do_one_initcall+0x128/0x378
[    3.744605]  [<0000000040102de8>] 0x40102de8
[    3.744605]  [<0000000040c33864>] kernel_init+0x60/0x3a8
[    3.744605]  [<00000000401d1020>] ret_from_kernel_thread+0x20/0x28
[    3.744605]

Fix this by moving the __inc_irq_stat() into the locked section.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index 3f7d6d5..65f50f0 100644 (file)
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -842,9 +842,9 @@ void flush_tlb_all(void)
 {
        int do_recycle;
 
-       __inc_irq_stat(irq_tlb_count);
        do_recycle = 0;
        spin_lock(&sid_lock);
+       __inc_irq_stat(irq_tlb_count);
        if (dirty_space_ids > RECYCLE_THRESHOLD) {
            BUG_ON(recycle_inuse);  /* FIXME: Use a semaphore/wait queue here */
            get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
@@ -863,8 +863,8 @@ void flush_tlb_all(void)
 #else
 void flush_tlb_all(void)
 {
-       __inc_irq_stat(irq_tlb_count);
        spin_lock(&sid_lock);
+       __inc_irq_stat(irq_tlb_count);
        flush_tlb_all_local(NULL);
        recycle_sids();
        spin_unlock(&sid_lock);