Hi Andrew,
Today's linux-next merge of the akpm-current tree got a conflict in
kernel/futex.c between commit a52b89ebb6d4 ("futexes: Increase hash table
size for better performance") from the tip tree and commit 61beee6c76e5
("futex: switch to USER_DS for futex test") from the akpm-current tree.
I fixed it up (see below) and can carry the fix as necessary (no action
is required).
--
Cheers,
Stephen Rothwell s...@canb.auug.org.au
diff --cc kernel/futex.c
index 3666aa0017ed,66d23727c6ab..000000000000
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@@ -63,7 -63,7 +63,8 @@@
#include <linux/sched/rt.h>
#include <linux/hugetlb.h>
#include <linux/freezer.h>
+#include <linux/bootmem.h>
+ #include <linux/uaccess.h>
#include <asm/futex.h>
@@@ -2845,19 -2734,9 +2846,20 @@@ SYSCALL_DEFINE6(futex, u32 __user *, ua
static int __init futex_init(void)
{
+ mm_segment_t fs;
u32 curval;
- int i;
+ unsigned long i;
+
+#if CONFIG_BASE_SMALL
+ futex_hashsize = 16;
+#else
+ futex_hashsize = roundup_pow_of_two(256 * num_possible_cpus());
+#endif
+
+ futex_queues = alloc_large_system_hash("futex", sizeof(*futex_queues),
+ futex_hashsize, 0,
+ futex_hashsize < 256 ?
HASH_SMALL : 0,
+ NULL, NULL, futex_hashsize,
futex_hashsize);
/*
* This will fail and we want it. Some arch implementations do
@@@ -2869,10 -2748,13 +2871,13 @@@
* implementation, the non-functional ones will return
* -ENOSYS.
*/
+ fs = get_fs();
+ set_fs(USER_DS);
if (cmpxchg_futex_value_locked(&curval, NULL, 0, 0) == -EFAULT)
futex_cmpxchg_enabled = 1;
+ set_fs(fs);
- for (i = 0; i < ARRAY_SIZE(futex_queues); i++) {
+ for (i = 0; i < futex_hashsize; i++) {
plist_head_init(&futex_queues[i].chain);
spin_lock_init(&futex_queues[i].lock);
}
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