@@ -6043,20 +6043,7 @@ static void __build_all_zonelists(void *data)
int nid;
int __maybe_unused cpu;
pg_data_t *self = data;
- unsigned long flags;
- /*
- * Explicitly disable this CPU's interrupts before taking seqlock
- * to prevent any IRQ handler from calling into the page allocator
- * (e.g. GFP_ATOMIC) that could hit zonelist_iter_begin and livelock.
- */
- local_irq_save(flags);
- /*
- * Explicitly disable this CPU's synchronous printk() before taking
- * seqlock to prevent any printk() from trying to hold port->lock, for
- * tty_insert_flip_string_and_push_buffer() on other CPU might be
- * calling kmalloc(GFP_ATOMIC | __GFP_NOWARN) with port->lock held.
- */
write_seqlock(&zonelist_update_seq);
#ifdef CONFIG_NUMA
@@ -6091,7 +6078,6 @@ static void __build_all_zonelists(void *data)
}
write_sequnlock(&zonelist_update_seq);
- local_irq_restore(flags);
}
static noinline void __init
v5.10.180-rt89-rc1 stable review patch. If anyone has any objections, please let me know. ----------- This reverts commit a992c387b41186ab968fd176ca26b432b05c53ec. The support for deferred printing was removed in v5.10-rc1-rt1 by commit 9153e3c5cb0c9 ("printk: remove deferred printing") because: Since printing occurs either atomically or from the printing kthread, there is no need for any deferring or tracking possible recursion paths. Remove all printk context tracking. Also, disabling interrupts in __build_all_zonelists() should produce warnings once that code path is hit. Fixes: a992c387b4118 ("mm/page_alloc: fix potential deadlock on zonelist_update_seq seqlock") Fixes: 083183f8bea0f ("rt: printk: remove new references to deferred printing") Signed-off-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com> --- mm/page_alloc.c | 14 -------------- 1 file changed, 14 deletions(-)