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percpu: reorder macros in percpu header files
* In include/asm-generic/percpu.h, collect {raw|_this}_cpu_generic*()
macros into one place. They were dispersed through
{raw|this}_cpu_*_N() definitions and the visiual inconsistency was
making following the code unnecessarily difficult.
* In include/linux/percpu-defs.h, move __verify_pcpu_ptr() later in
the file so that it's right above accessor definitions where it's
actually used.
This is pure reorganization.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Christoph Lameter <cl@linux.com>
This commit is contained in:
Tejun Heo
parent
a32f8d8eda
commit
9c28278a24
@ -65,6 +65,105 @@ extern void setup_per_cpu_areas(void);
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#define PER_CPU_DEF_ATTRIBUTES
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#endif
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#define raw_cpu_generic_to_op(pcp, val, op) \
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do { \
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*raw_cpu_ptr(&(pcp)) op val; \
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} while (0)
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#define raw_cpu_generic_add_return(pcp, val) \
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({ \
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raw_cpu_add(pcp, val); \
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raw_cpu_read(pcp); \
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})
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#define raw_cpu_generic_xchg(pcp, nval) \
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({ typeof(pcp) ret__; \
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ret__ = raw_cpu_read(pcp); \
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raw_cpu_write(pcp, nval); \
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ret__; \
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})
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#define raw_cpu_generic_cmpxchg(pcp, oval, nval) \
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({ \
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typeof(pcp) ret__; \
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ret__ = raw_cpu_read(pcp); \
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if (ret__ == (oval)) \
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raw_cpu_write(pcp, nval); \
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ret__; \
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})
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#define raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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({ \
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int __ret = 0; \
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if (raw_cpu_read(pcp1) == (oval1) && \
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raw_cpu_read(pcp2) == (oval2)) { \
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raw_cpu_write(pcp1, (nval1)); \
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raw_cpu_write(pcp2, (nval2)); \
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__ret = 1; \
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} \
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(__ret); \
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})
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#define _this_cpu_generic_read(pcp) \
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({ typeof(pcp) ret__; \
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preempt_disable(); \
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ret__ = *this_cpu_ptr(&(pcp)); \
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preempt_enable(); \
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ret__; \
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})
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#define _this_cpu_generic_to_op(pcp, val, op) \
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do { \
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unsigned long flags; \
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raw_local_irq_save(flags); \
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*raw_cpu_ptr(&(pcp)) op val; \
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raw_local_irq_restore(flags); \
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} while (0)
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#define _this_cpu_generic_add_return(pcp, val) \
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({ \
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typeof(pcp) ret__; \
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unsigned long flags; \
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raw_local_irq_save(flags); \
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raw_cpu_add(pcp, val); \
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ret__ = raw_cpu_read(pcp); \
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raw_local_irq_restore(flags); \
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ret__; \
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})
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#define _this_cpu_generic_xchg(pcp, nval) \
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({ typeof(pcp) ret__; \
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unsigned long flags; \
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raw_local_irq_save(flags); \
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ret__ = raw_cpu_read(pcp); \
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raw_cpu_write(pcp, nval); \
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raw_local_irq_restore(flags); \
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ret__; \
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})
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#define _this_cpu_generic_cmpxchg(pcp, oval, nval) \
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({ \
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typeof(pcp) ret__; \
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unsigned long flags; \
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raw_local_irq_save(flags); \
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ret__ = raw_cpu_read(pcp); \
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if (ret__ == (oval)) \
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raw_cpu_write(pcp, nval); \
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raw_local_irq_restore(flags); \
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ret__; \
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})
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#define _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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({ \
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int ret__; \
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unsigned long flags; \
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raw_local_irq_save(flags); \
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ret__ = raw_cpu_generic_cmpxchg_double(pcp1, pcp2, \
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oval1, oval2, nval1, nval2); \
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raw_local_irq_restore(flags); \
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ret__; \
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})
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# ifndef raw_cpu_read_1
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# define raw_cpu_read_1(pcp) (*raw_cpu_ptr(&(pcp)))
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# endif
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@ -78,11 +177,6 @@ extern void setup_per_cpu_areas(void);
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# define raw_cpu_read_8(pcp) (*raw_cpu_ptr(&(pcp)))
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# endif
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#define raw_cpu_generic_to_op(pcp, val, op) \
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do { \
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*raw_cpu_ptr(&(pcp)) op val; \
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} while (0)
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# ifndef raw_cpu_write_1
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# define raw_cpu_write_1(pcp, val) raw_cpu_generic_to_op((pcp), (val), =)
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# endif
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@ -135,12 +229,6 @@ do { \
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# define raw_cpu_or_8(pcp, val) raw_cpu_generic_to_op((pcp), (val), |=)
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# endif
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#define raw_cpu_generic_add_return(pcp, val) \
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({ \
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raw_cpu_add(pcp, val); \
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raw_cpu_read(pcp); \
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})
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# ifndef raw_cpu_add_return_1
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# define raw_cpu_add_return_1(pcp, val) raw_cpu_generic_add_return(pcp, val)
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# endif
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@ -154,13 +242,6 @@ do { \
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# define raw_cpu_add_return_8(pcp, val) raw_cpu_generic_add_return(pcp, val)
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# endif
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#define raw_cpu_generic_xchg(pcp, nval) \
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({ typeof(pcp) ret__; \
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ret__ = raw_cpu_read(pcp); \
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raw_cpu_write(pcp, nval); \
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ret__; \
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})
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# ifndef raw_cpu_xchg_1
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# define raw_cpu_xchg_1(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
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# endif
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@ -174,15 +255,6 @@ do { \
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# define raw_cpu_xchg_8(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
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# endif
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#define raw_cpu_generic_cmpxchg(pcp, oval, nval) \
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({ \
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typeof(pcp) ret__; \
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ret__ = raw_cpu_read(pcp); \
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if (ret__ == (oval)) \
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raw_cpu_write(pcp, nval); \
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ret__; \
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})
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# ifndef raw_cpu_cmpxchg_1
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# define raw_cpu_cmpxchg_1(pcp, oval, nval) raw_cpu_generic_cmpxchg(pcp, oval, nval)
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# endif
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@ -196,18 +268,6 @@ do { \
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# define raw_cpu_cmpxchg_8(pcp, oval, nval) raw_cpu_generic_cmpxchg(pcp, oval, nval)
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# endif
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#define raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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({ \
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int __ret = 0; \
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if (raw_cpu_read(pcp1) == (oval1) && \
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raw_cpu_read(pcp2) == (oval2)) { \
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raw_cpu_write(pcp1, (nval1)); \
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raw_cpu_write(pcp2, (nval2)); \
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__ret = 1; \
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} \
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(__ret); \
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})
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# ifndef raw_cpu_cmpxchg_double_1
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# define raw_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
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@ -225,14 +285,6 @@ do { \
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raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
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# endif
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#define _this_cpu_generic_read(pcp) \
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({ typeof(pcp) ret__; \
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preempt_disable(); \
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ret__ = *this_cpu_ptr(&(pcp)); \
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preempt_enable(); \
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ret__; \
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})
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# ifndef this_cpu_read_1
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# define this_cpu_read_1(pcp) _this_cpu_generic_read(pcp)
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# endif
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@ -246,14 +298,6 @@ do { \
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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_generic_to_op(pcp, val, op) \
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do { \
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unsigned long flags; \
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raw_local_irq_save(flags); \
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*raw_cpu_ptr(&(pcp)) op val; \
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raw_local_irq_restore(flags); \
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} while (0)
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# ifndef this_cpu_write_1
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# define this_cpu_write_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), =)
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# endif
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@ -306,17 +350,6 @@ do { \
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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_generic_add_return(pcp, val) \
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({ \
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typeof(pcp) ret__; \
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unsigned long flags; \
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raw_local_irq_save(flags); \
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raw_cpu_add(pcp, val); \
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ret__ = raw_cpu_read(pcp); \
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raw_local_irq_restore(flags); \
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ret__; \
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})
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# ifndef this_cpu_add_return_1
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# define this_cpu_add_return_1(pcp, val) _this_cpu_generic_add_return(pcp, val)
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# endif
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@ -330,16 +363,6 @@ do { \
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# define this_cpu_add_return_8(pcp, val) _this_cpu_generic_add_return(pcp, val)
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# endif
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#define _this_cpu_generic_xchg(pcp, nval) \
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({ typeof(pcp) ret__; \
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unsigned long flags; \
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raw_local_irq_save(flags); \
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ret__ = raw_cpu_read(pcp); \
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raw_cpu_write(pcp, nval); \
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raw_local_irq_restore(flags); \
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ret__; \
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})
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# ifndef this_cpu_xchg_1
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# define this_cpu_xchg_1(pcp, nval) _this_cpu_generic_xchg(pcp, nval)
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# endif
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@ -353,18 +376,6 @@ do { \
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# define this_cpu_xchg_8(pcp, nval) _this_cpu_generic_xchg(pcp, nval)
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# endif
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#define _this_cpu_generic_cmpxchg(pcp, oval, nval) \
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({ \
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typeof(pcp) ret__; \
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unsigned long flags; \
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raw_local_irq_save(flags); \
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ret__ = raw_cpu_read(pcp); \
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if (ret__ == (oval)) \
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raw_cpu_write(pcp, nval); \
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raw_local_irq_restore(flags); \
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ret__; \
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})
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# ifndef this_cpu_cmpxchg_1
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# define this_cpu_cmpxchg_1(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval)
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# endif
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@ -378,17 +389,6 @@ do { \
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# define this_cpu_cmpxchg_8(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval)
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# endif
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#define _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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({ \
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int ret__; \
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unsigned long flags; \
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raw_local_irq_save(flags); \
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ret__ = raw_cpu_generic_cmpxchg_double(pcp1, pcp2, \
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oval1, oval2, nval1, nval2); \
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raw_local_irq_restore(flags); \
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ret__; \
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})
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# ifndef this_cpu_cmpxchg_double_1
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# define this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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_this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
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@ -52,19 +52,6 @@
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#define __PCPU_DUMMY_ATTRS \
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__attribute__((section(".discard"), unused))
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/*
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* Macro which verifies @ptr is a percpu pointer without evaluating
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* @ptr. This is to be used in percpu accessors to verify that the
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* input parameter is a percpu pointer.
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*
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* + 0 is required in order to convert the pointer type from a
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* potential array type to a pointer to a single item of the array.
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*/
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#define __verify_pcpu_ptr(ptr) do { \
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const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL; \
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(void)__vpp_verify; \
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} while (0)
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/*
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* s390 and alpha modules require percpu variables to be defined as
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* weak to force the compiler to generate GOT based external
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@ -203,6 +190,19 @@
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*/
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#ifndef __ASSEMBLY__
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/*
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* Macro which verifies @ptr is a percpu pointer without evaluating
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* @ptr. This is to be used in percpu accessors to verify that the
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* input parameter is a percpu pointer.
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*
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* + 0 is required in order to convert the pointer type from a
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* potential array type to a pointer to a single item of the array.
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*/
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#define __verify_pcpu_ptr(ptr) do { \
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const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL; \
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(void)__vpp_verify; \
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} while (0)
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#ifdef CONFIG_SMP
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/*
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