patches: add patch for compat/lib-rhashtable.c

The file compat/lib-rhashtable.c is a copy from the backported kernel
source lib/rhashtable.c. This patch reverts a recent change to that
file, ie. commit 43ca5bc4f72e ("lib/rhashtable.c: simplify a strange
allocation pattern"). It introduced the function gfpflags_allow_blocking()
introduced in 4.4 kernel and kvmalloc() introduced in 4.12-rc1. Looking
at those functions backporting them is complicated so instead add this
patch that reverts the change for kernel prior to 4.12.

Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/patches/lib-rhashtable.patch b/patches/lib-rhashtable.patch
new file mode 100644 (file)
index 0000000..9c262b0
--- /dev/null
+++ b/patches/lib-rhashtable.patch
@@ -0,0 +1,32 @@
+--- a/compat/lib-rhashtable.c
++++ b/compat/lib-rhashtable.c
+@@ -86,11 +86,26 @@ static int alloc_bucket_locks(struct rhashtable *ht, struct bucket_table *tbl,
+               size = min(size, 1U << tbl->nest);
+ 
+       if (sizeof(spinlock_t) != 0) {
++#if LINUX_VERSION_IS_LESS(4,12,0)
++              tbl->locks = NULL;
++#ifdef CONFIG_NUMA
++              if (size * sizeof(spinlock_t) > PAGE_SIZE &&
++                  gfp == GFP_KERNEL)
++                      tbl->locks = vmalloc(size * sizeof(spinlock_t));
++#endif
++              if (gfp != GFP_KERNEL)
++                      gfp |= __GFP_NOWARN | __GFP_NORETRY;
++
++              if (!tbl->locks)
++                      tbl->locks = kmalloc_array(size, sizeof(spinlock_t),
++                                                 gfp);
++#else
+               if (gfpflags_allow_blocking(gfp))
+                       tbl->locks = kvmalloc(size * sizeof(spinlock_t), gfp);
+               else
+                       tbl->locks = kmalloc_array(size, sizeof(spinlock_t),
+                                                  gfp);
++#endif
+               if (!tbl->locks)
+                       return -ENOMEM;
+               for (i = 0; i < size; i++)
+-- 
+1.9.1
+