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KVM: arm64: Stop sparse from moaning at __hyp_this_cpu_ptr

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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>
This commit is contained in:
Marc Zyngier 2020-06-07 10:55:28 +01:00
parent 29eb5a3c57
commit b990d37fdf
1 changed files with 10 additions and 3 deletions
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13
arch/arm64/include/asm/kvm_asm.h
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@ -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) \