firmware: smccc: Pass only the required device probe arguments

The device probe passes zeroes for all seven argument registers to
arm_smccc_1_1_invoke(). On ARM32 Thumb-2, this binds an input to r7 and
GCC 8.5 reports "r7 cannot be used in asm here".

The current smccc_devices entries need at most one argument after the
function ID: TRNG_VERSION has none and RSI_ABI_VERSION takes a requested
version. Pass zero for that argument and omit the unused arguments,
avoiding the r7 constraint. Check argument requirements when adding new
probe functions to smccc_devices.

Cc: Lorenzo Pieralisi <lpieralisi@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Sudeep Holla <sudeep.holla@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Steven Price <steven.price@arm.com>
Cc: Suzuki K Poulose <Suzuki.Poulose@arm.com>
Cc: Andre Przywara <andre.przywara@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Fixes: d8263a131bb0 ("firmware: hwrng: arm_smccc_trng: Register as an SMCCC device")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202610070641.B8hxBJcf-lkp@intel.com/
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
Reviewed-by: Sudeep Holla <sudeep.holla@kernel.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

0 files changed, 0 insertions, 0 deletions