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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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The kernel build for s390 fails for gcc compilers with version 3.x, set the minimum required version of gcc to version 4.3. As the atomic builtins are available with all gcc 4.x compilers, use the __sync_val_compare_and_swap and __sync_bool_compare_and_swap functions to replace the complex macro and inline assembler magic in include/asm/cmpxchg.h. The compiler can just-do-it and generates better code with the builtins. While we are at it use __sync_bool_compare_and_swap for the _raw_compare_and_swap function in the spinlock code as well. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/*
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* Copyright IBM Corp. 1999, 2011
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*
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
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*/
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#ifndef __ASM_CMPXCHG_H
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#define __ASM_CMPXCHG_H
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#include <linux/mmdebug.h>
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#include <linux/types.h>
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#include <linux/bug.h>
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#define cmpxchg(ptr, o, n) \
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({ \
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__typeof__(*(ptr)) __o = (o); \
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__typeof__(*(ptr)) __n = (n); \
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(__typeof__(*(ptr))) __sync_val_compare_and_swap((ptr),__o,__n);\
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})
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#define cmpxchg64 cmpxchg
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#define cmpxchg_local cmpxchg
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#define cmpxchg64_local cmpxchg
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#define xchg(ptr, x) \
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({ \
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__typeof__(ptr) __ptr = (ptr); \
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__typeof__(*(ptr)) __old; \
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do { \
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__old = *__ptr; \
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} while (!__sync_bool_compare_and_swap(__ptr, __old, x)); \
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__old; \
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})
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#define __HAVE_ARCH_CMPXCHG
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#define __cmpxchg_double_op(p1, p2, o1, o2, n1, n2, insn) \
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({ \
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register __typeof__(*(p1)) __old1 asm("2") = (o1); \
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register __typeof__(*(p2)) __old2 asm("3") = (o2); \
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register __typeof__(*(p1)) __new1 asm("4") = (n1); \
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register __typeof__(*(p2)) __new2 asm("5") = (n2); \
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int cc; \
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asm volatile( \
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insn " %[old],%[new],%[ptr]\n" \
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" ipm %[cc]\n" \
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" srl %[cc],28" \
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: [cc] "=d" (cc), [old] "+d" (__old1), "+d" (__old2) \
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: [new] "d" (__new1), "d" (__new2), \
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[ptr] "Q" (*(p1)), "Q" (*(p2)) \
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: "memory", "cc"); \
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!cc; \
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})
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#define __cmpxchg_double_4(p1, p2, o1, o2, n1, n2) \
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__cmpxchg_double_op(p1, p2, o1, o2, n1, n2, "cds")
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#define __cmpxchg_double_8(p1, p2, o1, o2, n1, n2) \
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__cmpxchg_double_op(p1, p2, o1, o2, n1, n2, "cdsg")
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extern void __cmpxchg_double_called_with_bad_pointer(void);
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#define __cmpxchg_double(p1, p2, o1, o2, n1, n2) \
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({ \
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int __ret; \
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switch (sizeof(*(p1))) { \
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case 4: \
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__ret = __cmpxchg_double_4(p1, p2, o1, o2, n1, n2); \
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break; \
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case 8: \
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__ret = __cmpxchg_double_8(p1, p2, o1, o2, n1, n2); \
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break; \
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default: \
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__cmpxchg_double_called_with_bad_pointer(); \
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} \
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__ret; \
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})
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#define cmpxchg_double(p1, p2, o1, o2, n1, n2) \
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({ \
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__typeof__(p1) __p1 = (p1); \
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__typeof__(p2) __p2 = (p2); \
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int __ret; \
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BUILD_BUG_ON(sizeof(*(p1)) != sizeof(long)); \
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BUILD_BUG_ON(sizeof(*(p2)) != sizeof(long)); \
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VM_BUG_ON((unsigned long)((__p1) + 1) != (unsigned long)(__p2));\
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if (sizeof(long) == 4) \
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__ret = __cmpxchg_double_4(__p1, __p2, o1, o2, n1, n2); \
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else \
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__ret = __cmpxchg_double_8(__p1, __p2, o1, o2, n1, n2); \
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__ret; \
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})
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#define system_has_cmpxchg_double() 1
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#endif /* __ASM_CMPXCHG_H */
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