42 lines
1.6 KiB
Diff
42 lines
1.6 KiB
Diff
https://www.postgresql.org/message-id/dea97b6d-f55f-1f6d-9109-504aa7dfa421@gentoo.org
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The attached patch adds native spinlock support to PostgreSQL on RISC-V
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systems. As suspected by Richard W.M. Jones of Red Hat back in 2016, the
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__sync_lock_test_and_set() approach applied on arm and arm64 works here
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as well.
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Tested against PostgreSQL 13.3 on a physical rv64gc system (BeagleV
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Starlight beta board) - builds and installs fine, all tests pass. From
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what I can see in gcc documentation this should in theory work on rv32
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(and possibly rv128) as well, therefore the patch as it stands covers
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all RISC-V systems (i.e. doesn't check the value of __risc_xlen) - but I
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haven't confirmed this experimentally.
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--- a/src/include/storage/s_lock.h
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+++ b/src/include/storage/s_lock.h
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@@ -315,12 +315,12 @@
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#endif /* __ia64__ || __ia64 */
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/*
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- * On ARM and ARM64, we use __sync_lock_test_and_set(int *, int) if available.
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+ * On ARM, ARM64 and RISC-V, we use __sync_lock_test_and_set(int *, int) if available.
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*
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* We use the int-width variant of the builtin because it works on more chips
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* than other widths.
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*/
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-#if defined(__arm__) || defined(__arm) || defined(__aarch64__) || defined(__aarch64)
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+#if defined(__arm__) || defined(__arm) || defined(__aarch64__) || defined(__aarch64) || defined(__riscv)
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#ifdef HAVE_GCC__SYNC_INT32_TAS
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#define HAS_TEST_AND_SET
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@@ -337,7 +337,7 @@
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#define S_UNLOCK(lock) __sync_lock_release(lock)
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#endif /* HAVE_GCC__SYNC_INT32_TAS */
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-#endif /* __arm__ || __arm || __aarch64__ || __aarch64 */
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+#endif /* __arm__ || __arm || __aarch64__ || __aarch64 || __riscv */
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/* S/390 and S/390x Linux (32- and 64-bit zSeries) */
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