diff options
Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2050-mm-hmm.c-only-set-FAULT_FLAG_ALLOW_RETRY-for-non-blo.patch')
| -rw-r--r-- | meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2050-mm-hmm.c-only-set-FAULT_FLAG_ALLOW_RETRY-for-non-blo.patch | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2050-mm-hmm.c-only-set-FAULT_FLAG_ALLOW_RETRY-for-non-blo.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2050-mm-hmm.c-only-set-FAULT_FLAG_ALLOW_RETRY-for-non-blo.patch new file mode 100644 index 00000000..a85e3bd2 --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2050-mm-hmm.c-only-set-FAULT_FLAG_ALLOW_RETRY-for-non-blo.patch @@ -0,0 +1,40 @@ +From 609842ba18fa87c0567bd56a644d23d8ee8ee5a0 Mon Sep 17 00:00:00 2001 +From: "Kuehling, Felix" <Felix.Kuehling@amd.com> +Date: Tue, 28 May 2019 15:29:03 -0400 +Subject: [PATCH 2050/2940] mm/hmm.c: only set FAULT_FLAG_ALLOW_RETRY for + non-blocking +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Don't set this flag by default in hmm_vma_do_fault. It is set +conditionally just a few lines below. Setting it unconditionally +can lead to handle_mm_fault doing a non-blocking fault, returning +-EBUSY and unlocking mmap_sem unexpectedly. + +Link: http://lkml.kernel.org/r/20190510195258.9930-3-Felix.Kuehling@amd.com +Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com> +Reviewed-by: Jérôme Glisse <jglisse@redhat.com> +Cc: Alex Deucher <alex.deucher@amd.com> +Cc: Dave Airlie <airlied@gmail.com> +Signed-off-by: Andrew Morton <akpm@linux-foundation.org> +--- + mm/hmm.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/mm/hmm.c b/mm/hmm.c +index 4609bde6997e..5f5e3217491c 100644 +--- a/mm/hmm.c ++++ b/mm/hmm.c +@@ -331,7 +331,7 @@ struct hmm_vma_walk { + static int hmm_vma_do_fault(struct mm_walk *walk, unsigned long addr, + bool write_fault, uint64_t *pfn) + { +- unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_REMOTE; ++ unsigned int flags = FAULT_FLAG_REMOTE; + struct hmm_vma_walk *hmm_vma_walk = walk->private; + struct hmm_range *range = hmm_vma_walk->range; + struct vm_area_struct *vma = walk->vma; +-- +2.17.1 + |