mm: add a low limit to alloc_large_system_hash
UDP stack needs a minimum hash size value for proper operation and also
uses alloc_large_system_hash() for proper NUMA distribution of its hash
tables and automatic sizing depending on available system memory.
On some low memory situations, udp_table_init() must ignore the
alloc_large_system_hash() result and reallocs a bigger memory area.
As we cannot easily free old hash table, we leak it and kmemleak can
issue a warning.
This patch adds a low limit parameter to alloc_large_system_hash() to
solve this problem.
We then specify UDP_HTABLE_SIZE_MIN for UDP/UDPLite hash table
allocation.
Reported-by: Mark Asselstine <mark.asselstine@windriver.com>
Reported-by: Tim Bird <tim.bird@am.sony.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/fs/dcache.c b/fs/dcache.c
index 8c1ab8f..4435d8b 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -3093,6 +3093,7 @@
HASH_EARLY,
&d_hash_shift,
&d_hash_mask,
+ 0,
0);
for (loop = 0; loop < (1U << d_hash_shift); loop++)
@@ -3123,6 +3124,7 @@
0,
&d_hash_shift,
&d_hash_mask,
+ 0,
0);
for (loop = 0; loop < (1U << d_hash_shift); loop++)