[patch] distcc patch for Linux kernel 2.4.26

linux.patch (text/plain), 1.71 KB, created by Duke on 2004-06-28 14:41:45 UTC

--- a/mm/page_alloc.c.orig 2004-04-29 17:38:14.184021976 -0300
+++ b/mm/page_alloc.c 2004-04-29 17:47:27.906843312 -0300
@@ -46,6 +46,34 @@
 
 int vm_gfp_debug = 0;
 
+static void FASTCALL(__free_pages_ok (struct page *page, unsigned int order));
+
+static spinlock_t free_pages_ok_no_irq_lock = SPIN_LOCK_UNLOCKED;
+struct page * free_pages_ok_no_irq_head;
+
+static void do_free_pages_ok_no_irq(void * arg)
+{
+       struct page * page, * __page;
+
+       spin_lock_irq(&free_pages_ok_no_irq_lock);
+
+       page = free_pages_ok_no_irq_head;
+       free_pages_ok_no_irq_head = NULL;
+
+       spin_unlock_irq(&free_pages_ok_no_irq_lock);
+
+       while (page) {
+               __page = page;
+               page = page->next_hash;
+               __free_pages_ok(__page, __page->index);
+       }
+}
+
+static struct tq_struct free_pages_ok_no_irq_task = {
+       .routine        = do_free_pages_ok_no_irq,
+};
+
+
 /*
  * Temporary debugging check.
  */
@@ -81,7 +109,6 @@
  * -- wli
  */
 
-static void FASTCALL(__free_pages_ok (struct page *page, unsigned int order));
 static void __free_pages_ok (struct page *page, unsigned int order)
 {
  unsigned long index, page_idx, mask, flags;
@@ -94,8 +121,20 @@
   * a reference to a page in order to pin it for io. -ben
   */
  if (PageLRU(page)) {
-  if (unlikely(in_interrupt()))
-   BUG();
+  if (unlikely(in_interrupt())) {
+   unsigned long flags;
+
+   spin_lock_irqsave(&free_pages_ok_no_irq_lock, flags);
+   page->next_hash = free_pages_ok_no_irq_head;
+   free_pages_ok_no_irq_head = page;
+   page->index = order;
+ 
+   spin_unlock_irqrestore(&free_pages_ok_no_irq_lock, flags);
+ 
+   schedule_task(&free_pages_ok_no_irq_task);
+   return;
+  }
+  
   lru_cache_del(page);
  }