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Luc Van Oostenryck authored
The generic implementation of raw_cpu_generic_add_return() is: #define raw_cpu_generic_add_return(pcp, val) \ ({ \ typeof(&(pcp)) __p = raw_cpu_ptr(&(pcp)); \ \ *__p += val; \ *__p; \ }) where the 'pcp' argument is a __percpu lvalue. There, the variable '__p' is declared as a __percpu pointer the type of the address of 'pcp') but: 1) the value assigned to it, the return value of raw_cpu_ptr(), is a plain (__kernel) pointer, not a __percpu one. 2) this variable is dereferenced just after while a __percpu pointer is implicitly __noderef. So, fix the declaration of the 'pcp' variable to its correct type: the plain (non-percpu) pointer corresponding to pcp's address, using the fact that typeof() ignores the address space and the 'noderef' attribute of its agument. Same for raw_cpu_generic_xchg(), raw_cpu_generic_cmpxchg() & raw_cpu_generic_cmpxchg_double(). This removes 209 warnings on ARM, 525 on ARM64, 220 on x86 & more than 2600 on ppc64 (all of them with the default config). Cc: Tejun Heo <tj@kernel.org> Cc: Nicholas Piggin <npiggin@gmail.com> Reported-by: Ben Dooks <ben.dooks@codethink.co.uk> Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Dennis Zhou <dennis@kernel.org>
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