diff options
author | Tiejun Chen <tiejun.chen@windriver.com> | 2014-01-20 03:39:34 -0500 |
---|---|---|
committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-01-29 01:02:26 -0500 |
commit | 94b09d75546247ec7e0d441f352f548946619fe8 (patch) | |
tree | 70119625d7a0ccd906c1d0add2dbceed48086316 /arch/powerpc | |
parent | 91b973f90c1220d71923e7efe1e61f5329806380 (diff) |
powerpc/hugetlb: Replace __get_cpu_var with get_cpu_var
Replace __get_cpu_var safely with get_cpu_var to avoid
the following call trace:
[ 7253.637591] BUG: using smp_processor_id() in preemptible [00000000 00000000]
code: hugemmap01/9048
[ 7253.637601] caller is free_hugepd_range.constprop.25+0x88/0x1a8
[ 7253.637605] CPU: 1 PID: 9048 Comm: hugemmap01 Not tainted 3.10.20-rt14+ #114
[ 7253.637606] Call Trace:
[ 7253.637617] [cb049d80] [c0007ea4] show_stack+0x4c/0x168 (unreliable)
[ 7253.637624] [cb049dc0] [c031c674] debug_smp_processor_id+0x114/0x134
[ 7253.637628] [cb049de0] [c0016d28] free_hugepd_range.constprop.25+0x88/0x1a8
[ 7253.637632] [cb049e00] [c001711c] hugetlb_free_pgd_range+0x6c/0x168
[ 7253.637639] [cb049e40] [c0117408] free_pgtables+0x12c/0x150
[ 7253.637646] [cb049e70] [c011ce38] unmap_region+0xa0/0x11c
[ 7253.637671] [cb049ef0] [c011f03c] do_munmap+0x224/0x3bc
[ 7253.637676] [cb049f20] [c011f2e0] vm_munmap+0x38/0x5c
[ 7253.637682] [cb049f40] [c000ef88] ret_from_syscall+0x0/0x3c
[ 7253.637686] --- Exception: c01 at 0xff16004
Signed-off-by: Tiejun Chen<tiejun.chen@windriver.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r-- | arch/powerpc/mm/hugetlbpage.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index 90bb6d9409bf..eb923654ba80 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c | |||
@@ -472,12 +472,13 @@ static void hugepd_free(struct mmu_gather *tlb, void *hugepte) | |||
472 | { | 472 | { |
473 | struct hugepd_freelist **batchp; | 473 | struct hugepd_freelist **batchp; |
474 | 474 | ||
475 | batchp = &__get_cpu_var(hugepd_freelist_cur); | 475 | batchp = &get_cpu_var(hugepd_freelist_cur); |
476 | 476 | ||
477 | if (atomic_read(&tlb->mm->mm_users) < 2 || | 477 | if (atomic_read(&tlb->mm->mm_users) < 2 || |
478 | cpumask_equal(mm_cpumask(tlb->mm), | 478 | cpumask_equal(mm_cpumask(tlb->mm), |
479 | cpumask_of(smp_processor_id()))) { | 479 | cpumask_of(smp_processor_id()))) { |
480 | kmem_cache_free(hugepte_cache, hugepte); | 480 | kmem_cache_free(hugepte_cache, hugepte); |
481 | put_cpu_var(hugepd_freelist_cur); | ||
481 | return; | 482 | return; |
482 | } | 483 | } |
483 | 484 | ||
@@ -491,6 +492,7 @@ static void hugepd_free(struct mmu_gather *tlb, void *hugepte) | |||
491 | call_rcu_sched(&(*batchp)->rcu, hugepd_free_rcu_callback); | 492 | call_rcu_sched(&(*batchp)->rcu, hugepd_free_rcu_callback); |
492 | *batchp = NULL; | 493 | *batchp = NULL; |
493 | } | 494 | } |
495 | put_cpu_var(hugepd_freelist_cur); | ||
494 | } | 496 | } |
495 | #endif | 497 | #endif |
496 | 498 | ||