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authorLinus Torvalds <torvalds@linux-foundation.org>2023-04-28 09:43:49 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2023-04-28 09:43:49 -0700
commit22b8cc3e78f5448b4c5df00303817a9137cd663f (patch)
tree4c90f7ebbf4d439ae37f879f0e0f97c2eafd434b /mm/madvise.c
parent7b664cc38ea7bdd5e3ce018bba98583741921bd4 (diff)
parent97740266de26e5dfe6e4fbecacb6995b66c2e378 (diff)
Merge tag 'x86_mm_for_6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 LAM (Linear Address Masking) support from Dave Hansen: "Add support for the new Linear Address Masking CPU feature. This is similar to ARM's Top Byte Ignore and allows userspace to store metadata in some bits of pointers without masking it out before use" * tag 'x86_mm_for_6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mm/iommu/sva: Do not allow to set FORCE_TAGGED_SVA bit from outside x86/mm/iommu/sva: Fix error code for LAM enabling failure due to SVA selftests/x86/lam: Add test cases for LAM vs thread creation selftests/x86/lam: Add ARCH_FORCE_TAGGED_SVA test cases for linear-address masking selftests/x86/lam: Add inherit test cases for linear-address masking selftests/x86/lam: Add io_uring test cases for linear-address masking selftests/x86/lam: Add mmap and SYSCALL test cases for linear-address masking selftests/x86/lam: Add malloc and tag-bits test cases for linear-address masking x86/mm/iommu/sva: Make LAM and SVA mutually exclusive iommu/sva: Replace pasid_valid() helper with mm_valid_pasid() mm: Expose untagging mask in /proc/$PID/status x86/mm: Provide arch_prctl() interface for LAM x86/mm: Reduce untagged_addr() overhead for systems without LAM x86/uaccess: Provide untagged_addr() and remove tags before address check mm: Introduce untagged_addr_remote() x86/mm: Handle LAM on context switch x86: CPUID and CR3/CR4 flags for Linear Address Masking x86: Allow atomic MM_CONTEXT flags setting x86/mm: Rework address range check in get_user() and put_user()
Diffstat (limited to 'mm/madvise.c')
-rw-r--r--mm/madvise.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/madvise.c b/mm/madvise.c
index 24c5cffe3e6c..b5ffbaf616f5 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -1390,8 +1390,6 @@ int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int beh
size_t len;
struct blk_plug plug;
- start = untagged_addr(start);
-
if (!madvise_behavior_valid(behavior))
return -EINVAL;
@@ -1423,6 +1421,9 @@ int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int beh
mmap_read_lock(mm);
}
+ start = untagged_addr_remote(mm, start);
+ end = start + len;
+
blk_start_plug(&plug);
error = madvise_walk_vmas(mm, start, end, behavior,
madvise_vma_behavior);