UPSTREAM: kernel: Provide READ_ONCE and ASSIGN_ONCE
ACCESS_ONCE does not work reliably on non-scalar types. For
example gcc 4.6 and 4.7 might remove the volatile tag for such
accesses during the SRA (scalar replacement of aggregates) step
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145)
Let's provide READ_ONCE/ASSIGN_ONCE that will do all accesses via
scalar types as suggested by Linus Torvalds. Accesses larger than
the machines word size cannot be guaranteed to be atomic. These
macros will use memcpy and emit a build warning.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Issue: SEC-1289
Bug: 28705983
(cherry picked from commit 230fa253df6352af12ad0a16128760b5cb3f92df)
Change-Id: I6235247c7b3a5e14093d477417000ed82f7586a3
(cherry picked from commit 14f9e22136b225bc02f5a7924077e96d14c7e6cc)
1 file changed