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percpu: remove some sparse warnings
Make the following changes to remove some sparse warnings. * Make DEFINE_PER_CPU_SECTION() declare __pcpu_unique_* before defining it. * Annotate pcpu_extend_area_map() that it is entered with pcpu_lock held, releases it and then reacquires it. * Make percpu related macros use unique nested variable names. * While at it, add pcpu prefix to __size_call[_return]() macros as to-be-implemented sparse annotations will add percpu specific stuff to these macros. Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Christoph Lameter <cl@linux-foundation.org> Cc: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Tejun Heo
parent
64ef291f46
commit
0f5e4816db
4 changed files with 39 additions and 37 deletions
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@ -74,31 +74,31 @@ extern void __bad_percpu_size(void);
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#define percpu_to_op(op, var, val) \
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do { \
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typedef typeof(var) T__; \
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typedef typeof(var) pto_T__; \
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if (0) { \
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T__ tmp__; \
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tmp__ = (val); \
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pto_T__ pto_tmp__; \
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pto_tmp__ = (val); \
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} \
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switch (sizeof(var)) { \
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case 1: \
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asm(op "b %1,"__percpu_arg(0) \
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: "+m" (var) \
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: "qi" ((T__)(val))); \
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: "qi" ((pto_T__)(val))); \
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break; \
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case 2: \
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asm(op "w %1,"__percpu_arg(0) \
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: "+m" (var) \
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: "ri" ((T__)(val))); \
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: "ri" ((pto_T__)(val))); \
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break; \
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case 4: \
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asm(op "l %1,"__percpu_arg(0) \
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: "+m" (var) \
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: "ri" ((T__)(val))); \
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: "ri" ((pto_T__)(val))); \
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break; \
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case 8: \
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asm(op "q %1,"__percpu_arg(0) \
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: "+m" (var) \
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: "re" ((T__)(val))); \
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: "re" ((pto_T__)(val))); \
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break; \
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default: __bad_percpu_size(); \
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} \
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@ -106,31 +106,31 @@ do { \
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#define percpu_from_op(op, var, constraint) \
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({ \
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typeof(var) ret__; \
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typeof(var) pfo_ret__; \
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switch (sizeof(var)) { \
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case 1: \
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asm(op "b "__percpu_arg(1)",%0" \
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: "=q" (ret__) \
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: "=q" (pfo_ret__) \
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: constraint); \
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break; \
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case 2: \
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asm(op "w "__percpu_arg(1)",%0" \
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: "=r" (ret__) \
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: "=r" (pfo_ret__) \
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: constraint); \
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break; \
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case 4: \
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asm(op "l "__percpu_arg(1)",%0" \
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: "=r" (ret__) \
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: "=r" (pfo_ret__) \
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: constraint); \
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break; \
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case 8: \
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asm(op "q "__percpu_arg(1)",%0" \
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: "=r" (ret__) \
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: "=r" (pfo_ret__) \
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: constraint); \
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break; \
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default: __bad_percpu_size(); \
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} \
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ret__; \
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pfo_ret__; \
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})
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/*
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@ -60,6 +60,7 @@
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#define DEFINE_PER_CPU_SECTION(type, name, sec) \
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__PCPU_DUMMY_ATTRS char __pcpu_scope_##name; \
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extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \
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__PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \
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__PCPU_ATTRS(sec) PER_CPU_DEF_ATTRIBUTES __weak \
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__typeof__(type) per_cpu__##name
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@ -226,20 +226,20 @@ do { \
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extern void __bad_size_call_parameter(void);
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#define __size_call_return(stem, variable) \
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({ typeof(variable) ret__; \
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#define __pcpu_size_call_return(stem, variable) \
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({ typeof(variable) pscr_ret__; \
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switch(sizeof(variable)) { \
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case 1: ret__ = stem##1(variable);break; \
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case 2: ret__ = stem##2(variable);break; \
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case 4: ret__ = stem##4(variable);break; \
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case 8: ret__ = stem##8(variable);break; \
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case 1: pscr_ret__ = stem##1(variable);break; \
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case 2: pscr_ret__ = stem##2(variable);break; \
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case 4: pscr_ret__ = stem##4(variable);break; \
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case 8: pscr_ret__ = stem##8(variable);break; \
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default: \
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__bad_size_call_parameter();break; \
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} \
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ret__; \
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pscr_ret__; \
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})
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#define __size_call(stem, variable, ...) \
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#define __pcpu_size_call(stem, variable, ...) \
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do { \
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switch(sizeof(variable)) { \
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case 1: stem##1(variable, __VA_ARGS__);break; \
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@ -299,7 +299,7 @@ do { \
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# ifndef this_cpu_read_8
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# define this_cpu_read_8(pcp) _this_cpu_generic_read(pcp)
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# endif
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# define this_cpu_read(pcp) __size_call_return(this_cpu_read_, (pcp))
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# define this_cpu_read(pcp) __pcpu_size_call_return(this_cpu_read_, (pcp))
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#endif
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#define _this_cpu_generic_to_op(pcp, val, op) \
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@ -322,7 +322,7 @@ do { \
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# ifndef this_cpu_write_8
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# define this_cpu_write_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), =)
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# endif
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# define this_cpu_write(pcp, val) __size_call(this_cpu_write_, (pcp), (val))
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# define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, (pcp), (val))
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#endif
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#ifndef this_cpu_add
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@ -338,7 +338,7 @@ do { \
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# ifndef this_cpu_add_8
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# define this_cpu_add_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=)
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# endif
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# define this_cpu_add(pcp, val) __size_call(this_cpu_add_, (pcp), (val))
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# define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, (pcp), (val))
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#endif
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#ifndef this_cpu_sub
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@ -366,7 +366,7 @@ do { \
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# ifndef this_cpu_and_8
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# define this_cpu_and_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=)
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# endif
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# define this_cpu_and(pcp, val) __size_call(this_cpu_and_, (pcp), (val))
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# define this_cpu_and(pcp, val) __pcpu_size_call(this_cpu_and_, (pcp), (val))
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#endif
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#ifndef this_cpu_or
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@ -382,7 +382,7 @@ do { \
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# ifndef this_cpu_or_8
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# define this_cpu_or_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=)
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# endif
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# define this_cpu_or(pcp, val) __size_call(this_cpu_or_, (pcp), (val))
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# define this_cpu_or(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val))
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#endif
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#ifndef this_cpu_xor
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@ -398,7 +398,7 @@ do { \
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# ifndef this_cpu_xor_8
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# define this_cpu_xor_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=)
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# endif
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# define this_cpu_xor(pcp, val) __size_call(this_cpu_or_, (pcp), (val))
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# define this_cpu_xor(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val))
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#endif
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/*
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@ -428,7 +428,7 @@ do { \
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# ifndef __this_cpu_read_8
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# define __this_cpu_read_8(pcp) (*__this_cpu_ptr(&(pcp)))
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# endif
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# define __this_cpu_read(pcp) __size_call_return(__this_cpu_read_, (pcp))
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# define __this_cpu_read(pcp) __pcpu_size_call_return(__this_cpu_read_, (pcp))
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#endif
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#define __this_cpu_generic_to_op(pcp, val, op) \
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@ -449,7 +449,7 @@ do { \
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# ifndef __this_cpu_write_8
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# define __this_cpu_write_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), =)
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# endif
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# define __this_cpu_write(pcp, val) __size_call(__this_cpu_write_, (pcp), (val))
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# define __this_cpu_write(pcp, val) __pcpu_size_call(__this_cpu_write_, (pcp), (val))
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#endif
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#ifndef __this_cpu_add
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@ -465,7 +465,7 @@ do { \
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# ifndef __this_cpu_add_8
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# define __this_cpu_add_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=)
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# endif
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# define __this_cpu_add(pcp, val) __size_call(__this_cpu_add_, (pcp), (val))
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# define __this_cpu_add(pcp, val) __pcpu_size_call(__this_cpu_add_, (pcp), (val))
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#endif
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#ifndef __this_cpu_sub
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@ -493,7 +493,7 @@ do { \
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# ifndef __this_cpu_and_8
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# define __this_cpu_and_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=)
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# endif
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# define __this_cpu_and(pcp, val) __size_call(__this_cpu_and_, (pcp), (val))
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# define __this_cpu_and(pcp, val) __pcpu_size_call(__this_cpu_and_, (pcp), (val))
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#endif
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#ifndef __this_cpu_or
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@ -509,7 +509,7 @@ do { \
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# ifndef __this_cpu_or_8
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# define __this_cpu_or_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=)
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# endif
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# define __this_cpu_or(pcp, val) __size_call(__this_cpu_or_, (pcp), (val))
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# define __this_cpu_or(pcp, val) __pcpu_size_call(__this_cpu_or_, (pcp), (val))
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#endif
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#ifndef __this_cpu_xor
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@ -525,7 +525,7 @@ do { \
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# ifndef __this_cpu_xor_8
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# define __this_cpu_xor_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=)
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# endif
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# define __this_cpu_xor(pcp, val) __size_call(__this_cpu_xor_, (pcp), (val))
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# define __this_cpu_xor(pcp, val) __pcpu_size_call(__this_cpu_xor_, (pcp), (val))
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#endif
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/*
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@ -556,7 +556,7 @@ do { \
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# ifndef irqsafe_cpu_add_8
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# define irqsafe_cpu_add_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
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# endif
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# define irqsafe_cpu_add(pcp, val) __size_call(irqsafe_cpu_add_, (pcp), (val))
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# define irqsafe_cpu_add(pcp, val) __pcpu_size_call(irqsafe_cpu_add_, (pcp), (val))
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#endif
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#ifndef irqsafe_cpu_sub
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@ -584,7 +584,7 @@ do { \
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# ifndef irqsafe_cpu_and_8
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# define irqsafe_cpu_and_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
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# endif
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# define irqsafe_cpu_and(pcp, val) __size_call(irqsafe_cpu_and_, (val))
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# define irqsafe_cpu_and(pcp, val) __pcpu_size_call(irqsafe_cpu_and_, (val))
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#endif
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#ifndef irqsafe_cpu_or
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@ -600,7 +600,7 @@ do { \
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# ifndef irqsafe_cpu_or_8
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# define irqsafe_cpu_or_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
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# endif
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# define irqsafe_cpu_or(pcp, val) __size_call(irqsafe_cpu_or_, (val))
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# define irqsafe_cpu_or(pcp, val) __pcpu_size_call(irqsafe_cpu_or_, (val))
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#endif
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#ifndef irqsafe_cpu_xor
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@ -616,7 +616,7 @@ do { \
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# ifndef irqsafe_cpu_xor_8
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# define irqsafe_cpu_xor_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
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# endif
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# define irqsafe_cpu_xor(pcp, val) __size_call(irqsafe_cpu_xor_, (val))
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# define irqsafe_cpu_xor(pcp, val) __pcpu_size_call(irqsafe_cpu_xor_, (val))
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#endif
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#endif /* __LINUX_PERCPU_H */
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@ -365,6 +365,7 @@ static struct pcpu_chunk *pcpu_chunk_addr_search(void *addr)
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* 0 if noop, 1 if successfully extended, -errno on failure.
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*/
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static int pcpu_extend_area_map(struct pcpu_chunk *chunk)
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__releases(lock) __acquires(lock)
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{
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int new_alloc;
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int *new;
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