include/exec/memory.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
Although the doc comment says "Called within RCU critical section" the
address_space_read() function takes the RCU read lock itself. There is
no need for the caller to hold an RCU read lock.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Fixes: b2a44fcad74f1cc7a6786d38eba7db12ab2352ba ("address_space_read: address_space_to_flatview needs RCU lock")
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
include/exec/memory.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/exec/memory.h b/include/exec/memory.h
index c3d417d317..60508a1e19 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -2768,7 +2768,7 @@ static inline bool memory_access_is_direct(MemoryRegion *mr, bool is_write)
*
* Return a MemTxResult indicating whether the operation succeeded
* or failed (eg unassigned memory, device rejected the transaction,
- * IOMMU fault). Called within RCU critical section.
+ * IOMMU fault).
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
--
2.31.1
On 9/9/21 4:10 PM, Stefan Hajnoczi wrote: > Although the doc comment says "Called within RCU critical section" the > address_space_read() function takes the RCU read lock itself. There is > no need for the caller to hold an RCU read lock. > > Cc: Paolo Bonzini <pbonzini@redhat.com> > Fixes: b2a44fcad74f1cc7a6786d38eba7db12ab2352ba ("address_space_read: address_space_to_flatview needs RCU lock") > Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> > --- > include/exec/memory.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
On 09.09.21 16:10, Stefan Hajnoczi wrote: > Although the doc comment says "Called within RCU critical section" the > address_space_read() function takes the RCU read lock itself. There is > no need for the caller to hold an RCU read lock. > > Cc: Paolo Bonzini <pbonzini@redhat.com> > Fixes: b2a44fcad74f1cc7a6786d38eba7db12ab2352ba ("address_space_read: address_space_to_flatview needs RCU lock") > Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> > --- > include/exec/memory.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/exec/memory.h b/include/exec/memory.h > index c3d417d317..60508a1e19 100644 > --- a/include/exec/memory.h > +++ b/include/exec/memory.h > @@ -2768,7 +2768,7 @@ static inline bool memory_access_is_direct(MemoryRegion *mr, bool is_write) > * > * Return a MemTxResult indicating whether the operation succeeded > * or failed (eg unassigned memory, device rejected the transaction, > - * IOMMU fault). Called within RCU critical section. > + * IOMMU fault). > * > * @as: #AddressSpace to be accessed > * @addr: address within that address space > Reviewed-by: David Hildenbrand <david@redhat.com> -- Thanks, David / dhildenb
On 09/09/21 16:10, Stefan Hajnoczi wrote: > Although the doc comment says "Called within RCU critical section" the > address_space_read() function takes the RCU read lock itself. There is > no need for the caller to hold an RCU read lock. > > Cc: Paolo Bonzini <pbonzini@redhat.com> > Fixes: b2a44fcad74f1cc7a6786d38eba7db12ab2352ba ("address_space_read: address_space_to_flatview needs RCU lock") > Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> > --- > include/exec/memory.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/exec/memory.h b/include/exec/memory.h > index c3d417d317..60508a1e19 100644 > --- a/include/exec/memory.h > +++ b/include/exec/memory.h > @@ -2768,7 +2768,7 @@ static inline bool memory_access_is_direct(MemoryRegion *mr, bool is_write) > * > * Return a MemTxResult indicating whether the operation succeeded > * or failed (eg unassigned memory, device rejected the transaction, > - * IOMMU fault). Called within RCU critical section. > + * IOMMU fault). > * > * @as: #AddressSpace to be accessed > * @addr: address within that address space > Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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