lkml.org 
[lkml]   [2016]   [May]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[Patch v4 1/9] iommu/amd: clean up the cmpxchg64 invocation
Date
Change it as it's designed for and keep it consistent with other
places.

Signed-off-by: Baoquan He <bhe@redhat.com>
---
drivers/iommu/amd_iommu.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 5efadad..9ec7cad 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1287,7 +1287,8 @@ static u64 *alloc_pte(struct protection_domain *domain,

__npte = PM_LEVEL_PDE(level, virt_to_phys(page));

- if (cmpxchg64(pte, __pte, __npte)) {
+ /* pte could have been changed somewhere. */
+ if (cmpxchg64(pte, __pte, __npte) != __pte) {
free_page((unsigned long)page);
continue;
}
--
2.5.5
\
 
 \ /
  Last update: 2016-05-25 09:01    [W:0.081 / U:0.740 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site