lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Sat, 21 May 2016 02:41:51 +0000 From: Wei Yang <richard.weiyang@...il.com> To: joro@...tes.org Cc: dwmw2@...radead.org, iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, Wei Yang <richard.weiyang@...il.com> Subject: [PATCH] iommu/vt-d: reduce extra first level entry in iommu->domains In commit <8bf478163e69> ("iommu/vt-d: Split up iommu->domains array"), it it splits iommu->domains in two levels. Each first level contains 256 entries of second level. In case of the ndomains is exact a multiple of 256, it would have one more extra first level entry for current implementation. This patch refines this calculation to reduce the extra first level entry. Signed-off-by: Wei Yang <richard.weiyang@...il.com> --- drivers/iommu/intel-iommu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index e3061d3..2204ca4 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1634,7 +1634,7 @@ static int iommu_init_domains(struct intel_iommu *iommu) return -ENOMEM; } - size = ((ndomains >> 8) + 1) * sizeof(struct dmar_domain **); + size = (ALIGN(ndomains, 256) >> 8) * sizeof(struct dmar_domain **); iommu->domains = kzalloc(size, GFP_KERNEL); if (iommu->domains) { @@ -1699,7 +1699,7 @@ static void disable_dmar_iommu(struct intel_iommu *iommu) static void free_dmar_iommu(struct intel_iommu *iommu) { if ((iommu->domains) && (iommu->domain_ids)) { - int elems = (cap_ndoms(iommu->cap) >> 8) + 1; + int elems = ALIGN(cap_ndoms(iommu->cap), 256) >> 8; int i; for (i = 0; i < elems; i++) -- 1.7.9.5
Powered by blists - more mailing lists