When CONFIG_SPECULATIVE_HARDEN_LOCK is active, this reads:
static always_inline bool lock_evaluate_nospec(bool condition)
{
return arch_lock_evaluate_nospec(condition);
return condition;
}
Insert an #else to take out the second return.
Fixes: 7ef0084418e1 ("x86/spinlock: introduce support for blocking speculation into critical regions")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: Roger Pau Monné <roger.pau@citrix.com>
CC: Stefano Stabellini <sstabellini@kernel.org>
CC: consulting@bugseng.com <consulting@bugseng.com>
CC: Roberto Bagnara <roberto.bagnara@bugseng.com>
CC: Federico Serafini <federico.serafini@bugseng.com>
CC: Nicola Vetrini <nicola.vetrini@bugseng.com>
---
xen/include/xen/nospec.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/xen/include/xen/nospec.h b/xen/include/xen/nospec.h
index 9fb15aa26aa9..828dbd4e0ad8 100644
--- a/xen/include/xen/nospec.h
+++ b/xen/include/xen/nospec.h
@@ -82,8 +82,9 @@ static always_inline bool lock_evaluate_nospec(bool condition)
{
#ifdef CONFIG_SPECULATIVE_HARDEN_LOCK
return arch_lock_evaluate_nospec(condition);
-#endif
+#else
return condition;
+#endif
}
#endif /* XEN_NOSPEC_H */
base-commit: 0e7ea8ca5fc9bce9248414f6aaf2dc861abd45d9
--
2.30.2
On Wed, 10 Apr 2024, Andrew Cooper wrote: > When CONFIG_SPECULATIVE_HARDEN_LOCK is active, this reads: > > static always_inline bool lock_evaluate_nospec(bool condition) > { > return arch_lock_evaluate_nospec(condition); > return condition; > } > > Insert an #else to take out the second return. > > Fixes: 7ef0084418e1 ("x86/spinlock: introduce support for blocking speculation into critical regions") > Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
> On 10 Apr 2024, at 20:26, Andrew Cooper <andrew.cooper3@citrix.com> wrote: > > When CONFIG_SPECULATIVE_HARDEN_LOCK is active, this reads: > > static always_inline bool lock_evaluate_nospec(bool condition) > { > return arch_lock_evaluate_nospec(condition); > return condition; > } > > Insert an #else to take out the second return. > > Fixes: 7ef0084418e1 ("x86/spinlock: introduce support for blocking speculation into critical regions") > Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> > --- Reviewed-by: Luca Fancellu <luca.fancellu@arm.com>
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