44 lines
1.4 KiB
Diff
44 lines
1.4 KiB
Diff
--- ceph-17.2.0-359-gb2fe9ec8/cmake/modules/CheckCxxAtomic.cmake.orig 2022-06-03 08:45:32.341075140 -0400
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+++ ceph-17.2.0-359-gb2fe9ec8/cmake/modules/CheckCxxAtomic.cmake 2022-06-03 08:46:47.195775813 -0400
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@@ -10,8 +10,9 @@
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check_cxx_source_compiles("
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#include <atomic>
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#include <cstdint>
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+#include <cstddef>
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-#if defined(__s390x__) || defined(__mips__)
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+#if defined(__SIZEOF_INT128__)
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// Boost needs 16-byte atomics for tagged pointers.
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// These are implemented via inline instructions on the platform
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// if 16-byte alignment can be proven, and are delegated to libatomic
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@@ -21,13 +22,27 @@
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// We specifically test access via an otherwise unknown pointer here
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// to ensure we get the most complex case. If this access can be
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// done without libatomic, then all accesses can be done.
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-bool atomic16(std::atomic<unsigned __int128> *ptr)
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+struct tagged_ptr {
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+ int* ptr;
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+ std::size_t tag;
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+};
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+
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+void atomic16(std::atomic<tagged_ptr> *ptr) __attribute__ ((used));
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+void atomic16(std::atomic<tagged_ptr> *ptr)
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{
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- return *ptr != 0;
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+ tagged_ptr p{nullptr, 1};
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+ ptr->store(p);
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+ tagged_ptr f = ptr->load();
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+ tagged_ptr new_tag{nullptr, 0};
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+ ptr->compare_exchange_strong(f, new_tag);
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}
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#endif
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int main() {
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+#if defined(__SIZEOF_INT128__)
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+ std::atomic<tagged_ptr> ptr;
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+ atomic16(&ptr);
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+#endif
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std::atomic<uint8_t> w1;
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std::atomic<uint16_t> w2;
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std::atomic<uint32_t> w4;
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