5a79859ae0
Remove the 31 bit support in order to reduce maintenance cost and
effectively remove dead code. Since a couple of years there is no
distribution left that comes with a 31 bit kernel.
The 31 bit kernel also has been broken since more than a year before
anybody noticed. In addition I added a removal warning to the kernel
shown at ipl for 5 minutes: a960062e58 ("s390: add 31 bit warning
message") which let everybody know about the plan to remove 31 bit
code. We didn't get any response.
Given that the last 31 bit only machine was introduced in 1999 let's
remove the code.
Anybody with 31 bit user space code can still use the compat mode.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
187 lines
6.4 KiB
C
187 lines
6.4 KiB
C
#ifndef __ARCH_S390_PERCPU__
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#define __ARCH_S390_PERCPU__
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#include <linux/preempt.h>
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#include <asm/cmpxchg.h>
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/*
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* s390 uses its own implementation for per cpu data, the offset of
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* the cpu local data area is cached in the cpu's lowcore memory.
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*/
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#define __my_cpu_offset S390_lowcore.percpu_offset
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/*
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* For 64 bit module code, the module may be more than 4G above the
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* per cpu area, use weak definitions to force the compiler to
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* generate external references.
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*/
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#if defined(CONFIG_SMP) && defined(MODULE)
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#define ARCH_NEEDS_WEAK_PER_CPU
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#endif
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/*
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* We use a compare-and-swap loop since that uses less cpu cycles than
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* disabling and enabling interrupts like the generic variant would do.
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*/
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#define arch_this_cpu_to_op_simple(pcp, val, op) \
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({ \
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typedef typeof(pcp) pcp_op_T__; \
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pcp_op_T__ old__, new__, prev__; \
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pcp_op_T__ *ptr__; \
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preempt_disable(); \
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ptr__ = raw_cpu_ptr(&(pcp)); \
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prev__ = *ptr__; \
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do { \
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old__ = prev__; \
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new__ = old__ op (val); \
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prev__ = cmpxchg(ptr__, old__, new__); \
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} while (prev__ != old__); \
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preempt_enable(); \
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new__; \
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})
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#define this_cpu_add_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
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#define this_cpu_add_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
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#define this_cpu_add_return_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
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#define this_cpu_add_return_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
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#define this_cpu_and_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
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#define this_cpu_and_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
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#define this_cpu_or_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
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#define this_cpu_or_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
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#ifndef CONFIG_HAVE_MARCH_Z196_FEATURES
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#define this_cpu_add_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
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#define this_cpu_add_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
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#define this_cpu_add_return_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
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#define this_cpu_add_return_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
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#define this_cpu_and_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
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#define this_cpu_and_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
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#define this_cpu_or_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
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#define this_cpu_or_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
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#else /* CONFIG_HAVE_MARCH_Z196_FEATURES */
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#define arch_this_cpu_add(pcp, val, op1, op2, szcast) \
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{ \
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typedef typeof(pcp) pcp_op_T__; \
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pcp_op_T__ val__ = (val); \
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pcp_op_T__ old__, *ptr__; \
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preempt_disable(); \
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ptr__ = raw_cpu_ptr(&(pcp)); \
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if (__builtin_constant_p(val__) && \
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((szcast)val__ > -129) && ((szcast)val__ < 128)) { \
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asm volatile( \
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op2 " %[ptr__],%[val__]\n" \
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: [ptr__] "+Q" (*ptr__) \
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: [val__] "i" ((szcast)val__) \
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: "cc"); \
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} else { \
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asm volatile( \
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op1 " %[old__],%[val__],%[ptr__]\n" \
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: [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
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: [val__] "d" (val__) \
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: "cc"); \
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} \
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preempt_enable(); \
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}
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#define this_cpu_add_4(pcp, val) arch_this_cpu_add(pcp, val, "laa", "asi", int)
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#define this_cpu_add_8(pcp, val) arch_this_cpu_add(pcp, val, "laag", "agsi", long)
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#define arch_this_cpu_add_return(pcp, val, op) \
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({ \
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typedef typeof(pcp) pcp_op_T__; \
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pcp_op_T__ val__ = (val); \
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pcp_op_T__ old__, *ptr__; \
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preempt_disable(); \
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ptr__ = raw_cpu_ptr(&(pcp)); \
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asm volatile( \
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op " %[old__],%[val__],%[ptr__]\n" \
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: [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
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: [val__] "d" (val__) \
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: "cc"); \
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preempt_enable(); \
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old__ + val__; \
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})
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#define this_cpu_add_return_4(pcp, val) arch_this_cpu_add_return(pcp, val, "laa")
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#define this_cpu_add_return_8(pcp, val) arch_this_cpu_add_return(pcp, val, "laag")
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#define arch_this_cpu_to_op(pcp, val, op) \
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{ \
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typedef typeof(pcp) pcp_op_T__; \
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pcp_op_T__ val__ = (val); \
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pcp_op_T__ old__, *ptr__; \
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preempt_disable(); \
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ptr__ = raw_cpu_ptr(&(pcp)); \
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asm volatile( \
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op " %[old__],%[val__],%[ptr__]\n" \
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: [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
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: [val__] "d" (val__) \
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: "cc"); \
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preempt_enable(); \
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}
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#define this_cpu_and_4(pcp, val) arch_this_cpu_to_op(pcp, val, "lan")
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#define this_cpu_and_8(pcp, val) arch_this_cpu_to_op(pcp, val, "lang")
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#define this_cpu_or_4(pcp, val) arch_this_cpu_to_op(pcp, val, "lao")
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#define this_cpu_or_8(pcp, val) arch_this_cpu_to_op(pcp, val, "laog")
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#endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */
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#define arch_this_cpu_cmpxchg(pcp, oval, nval) \
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({ \
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typedef typeof(pcp) pcp_op_T__; \
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pcp_op_T__ ret__; \
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pcp_op_T__ *ptr__; \
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preempt_disable(); \
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ptr__ = raw_cpu_ptr(&(pcp)); \
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ret__ = cmpxchg(ptr__, oval, nval); \
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preempt_enable(); \
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ret__; \
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})
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#define this_cpu_cmpxchg_1(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
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#define this_cpu_cmpxchg_2(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
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#define this_cpu_cmpxchg_4(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
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#define this_cpu_cmpxchg_8(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
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#define arch_this_cpu_xchg(pcp, nval) \
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({ \
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typeof(pcp) *ptr__; \
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typeof(pcp) ret__; \
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preempt_disable(); \
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ptr__ = raw_cpu_ptr(&(pcp)); \
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ret__ = xchg(ptr__, nval); \
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preempt_enable(); \
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ret__; \
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})
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#define this_cpu_xchg_1(pcp, nval) arch_this_cpu_xchg(pcp, nval)
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#define this_cpu_xchg_2(pcp, nval) arch_this_cpu_xchg(pcp, nval)
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#define this_cpu_xchg_4(pcp, nval) arch_this_cpu_xchg(pcp, nval)
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#define this_cpu_xchg_8(pcp, nval) arch_this_cpu_xchg(pcp, nval)
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#define arch_this_cpu_cmpxchg_double(pcp1, pcp2, o1, o2, n1, n2) \
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({ \
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typeof(pcp1) o1__ = (o1), n1__ = (n1); \
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typeof(pcp2) o2__ = (o2), n2__ = (n2); \
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typeof(pcp1) *p1__; \
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typeof(pcp2) *p2__; \
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int ret__; \
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preempt_disable(); \
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p1__ = raw_cpu_ptr(&(pcp1)); \
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p2__ = raw_cpu_ptr(&(pcp2)); \
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ret__ = __cmpxchg_double(p1__, p2__, o1__, o2__, n1__, n2__); \
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preempt_enable(); \
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ret__; \
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})
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#define this_cpu_cmpxchg_double_4 arch_this_cpu_cmpxchg_double
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#define this_cpu_cmpxchg_double_8 arch_this_cpu_cmpxchg_double
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#include <asm-generic/percpu.h>
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#endif /* __ARCH_S390_PERCPU__ */
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