KVM: arm64: Stop sparse from moaning at __hyp_this_cpu_ptr (b990d37f) · Commits · 戴 / test

Sparse complains that __hyp_this_cpu_ptr() returns something that is flagged noderef and not in the correct address space (both being the result of the __percpu annotation). Pretend that __hyp_this_cpu_ptr() knows what it is doing by forcefully casting the pointer with __kernel __force. Signed-off-by:

Marc Zyngier <maz@kernel.org>

arch/arm64/include/asm/kvm_asm.h

+10 −3

Original line number	Diff line number	Diff line
		@@ -81,12 +81,19 @@ extern u32 __kvm_get_mdcr_el2(void);

		extern char __smccc_workaround_1_smc[__SMCCC_WORKAROUND_1_SMC_SZ];

		/* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */
		/*
		* Home-grown __this_cpu_{ptr,read} variants that always work at HYP,
		* provided that sym is really a symbol and not a pointer obtained from
		* a data structure. As for SHIFT_PERCPU_PTR(), the creative casting keeps
		* sparse quiet.
		*/
		#define __hyp_this_cpu_ptr(sym) \
		({ \
		void *__ptr = hyp_symbol_addr(sym); \
		void *__ptr; \
		__verify_pcpu_ptr(&sym); \
		__ptr = hyp_symbol_addr(sym); \
		__ptr += read_sysreg(tpidr_el2); \
		(typeof(&sym))__ptr; \
		(typeof(sym) __kernel __force *)__ptr; \
		})

		#define __hyp_this_cpu_read(sym) \

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