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    SubjectRe: [PATCH 01/14] arm/arm64: smccc: Add SMCCC-specific return codes
    On Tue, May 22, 2018 at 04:06:35PM +0100, Marc Zyngier wrote:
    > We've so far used the PSCI return codes for SMCCC because they
    > were extremely similar. But with the new ARM DEN 0070A specification,
    > "NOT_REQUIRED" (-2) is clashing with PSCI's "PSCI_RET_INVALID_PARAMS".
    >
    > Let's bite the bullet and add SMCCC specific return codes. Users
    > can be repainted as and when required.
    >
    > Acked-by: Will Deacon <will.deacon@arm.com>
    > Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

    Reviewed-by: Mark Rutland <mark.rutland@arm.com>

    Mark.

    > ---
    > include/linux/arm-smccc.h | 5 +++++
    > 1 file changed, 5 insertions(+)
    >
    > diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
    > index a031897fca76..c89da86de99f 100644
    > --- a/include/linux/arm-smccc.h
    > +++ b/include/linux/arm-smccc.h
    > @@ -291,5 +291,10 @@ asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
    > */
    > #define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__)
    >
    > +/* Return codes defined in ARM DEN 0070A */
    > +#define SMCCC_RET_SUCCESS 0
    > +#define SMCCC_RET_NOT_SUPPORTED -1
    > +#define SMCCC_RET_NOT_REQUIRED -2
    > +
    > #endif /*__ASSEMBLY__*/
    > #endif /*__LINUX_ARM_SMCCC_H*/
    > --
    > 2.14.2
    >
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    > kvmarm@lists.cs.columbia.edu
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