[PATCH v2 2/7] powerpc/secvar: WARN_ON_ONCE() if multiple secvar ops are set
From: Russell Currey <hidden>
Date: 2022-12-30 04:21:55
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
The secvar code only supports one consumer at a time. Multiple consumers aren't possible at this point in time, but we'd want it to be obvious if it ever could happen. Signed-off-by: Russell Currey <redacted> --- arch/powerpc/kernel/secvar-ops.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/secvar-ops.c b/arch/powerpc/kernel/secvar-ops.c
index 6a29777d6a2d..aa1b2adc2710 100644
--- a/arch/powerpc/kernel/secvar-ops.c
+++ b/arch/powerpc/kernel/secvar-ops.c@@ -8,10 +8,12 @@ #include <linux/cache.h> #include <asm/secvar.h> +#include <asm/bug.h> -const struct secvar_operations *secvar_ops __ro_after_init; +const struct secvar_operations *secvar_ops __ro_after_init = NULL; void set_secvar_ops(const struct secvar_operations *ops) { + WARN_ON_ONCE(secvar_ops); secvar_ops = ops; }
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2.38.1