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79 lines
3.0 KiB
79 lines
3.0 KiB
From f5cf70d9d1dc7f4cbeffb7fb75cbbe08720e3873 Mon Sep 17 00:00:00 2001
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From: Gustavo Romero <gromero@br.ibm.com>
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Date: Sun, 26 Mar 2017 15:08:15 +0000
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Subject: [PATCH] Remove dependency on glibc on PPC
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Remove dependency on glibc by using gcc builtin function and no glibc
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wrappers.
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Currently there are no surrogates in musl for:
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__ppc_get_timebase()
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__ppc_set_ppr_low()
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__ppc_set_ppr_med()
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however glibc __ppc_get_timebase() is just a wrapper for GCC builtin
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__builtin_get_timebase() available since GCC 4.8 [1], so assuming that
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aports on ppc64le will never be built using GCC < 4.8 we can just
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switch directly to the GCC builtin function.
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Also __ppc_set_ppr_{low,med}() are not available on musl but both
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are simple glibc wrappers on a single asm instruction, hence there
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is no harm in using asm directly instead. Actually, using asm
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directly was the first solution adopted in MariaDB [2].
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[1] https://goo.gl/jxLV6O
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[2] https://goo.gl/9bjuVC
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--- a/storage/xtradb/include/ut0ut.h
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+++ b/storage/xtradb/include/ut0ut.h
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@@ -83,9 +83,8 @@ private:
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the YieldProcessor macro defined in WinNT.h. It is a CPU architecture-
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independent way by using YieldProcessor. */
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# define UT_RELAX_CPU() YieldProcessor()
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-# elif defined(__powerpc__) && defined __GLIBC__
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-#include <sys/platform/ppc.h>
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-# define UT_RELAX_CPU() __ppc_get_timebase()
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+# elif defined(__powerpc__)
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+# define UT_RELAX_CPU() __builtin_ppc_get_timebase()
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# else
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# define UT_RELAX_CPU() ((void)0) /* avoid warning for an empty statement */
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# endif
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@@ -99,9 +98,8 @@ private:
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#endif
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# if defined(HAVE_HMT_PRIORITY_INSTRUCTION)
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-#include <sys/platform/ppc.h>
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-# define UT_LOW_PRIORITY_CPU() __ppc_set_ppr_low()
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-# define UT_RESUME_PRIORITY_CPU() __ppc_set_ppr_med()
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+# define UT_LOW_PRIORITY_CPU() __asm__ __volatile__ ("or 1,1,1")
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+# define UT_RESUME_PRIORITY_CPU() __asm__ __volatile__ ("or 2,2,2")
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# else
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# define UT_LOW_PRIORITY_CPU() ((void)0)
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# define UT_RESUME_PRIORITY_CPU() ((void)0)
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--- a/storage/innobase/include/ut0ut.h
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+++ b/storage/innobase/include/ut0ut.h
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@@ -68,9 +68,8 @@ Created 1/20/1994 Heikki Tuuri
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the YieldProcessor macro defined in WinNT.h. It is a CPU architecture-
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independent way by using YieldProcessor. */
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# define UT_RELAX_CPU() YieldProcessor()
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-#elif defined(__powerpc__) && defined __GLIBC__
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-# include <sys/platform/ppc.h>
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-# define UT_RELAX_CPU() __ppc_get_timebase()
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+#elif defined(__powerpc__)
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+# define UT_RELAX_CPU() __builtin_ppc_get_timebase()
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#else
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# define UT_RELAX_CPU() do { \
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volatile int32 volatile_var; \
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@@ -88,9 +87,8 @@ Created 1/20/1994 Heikki Tuuri
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#endif
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#if defined(HAVE_HMT_PRIORITY_INSTRUCTION)
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-# include <sys/platform/ppc.h>
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-# define UT_LOW_PRIORITY_CPU() __ppc_set_ppr_low()
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-# define UT_RESUME_PRIORITY_CPU() __ppc_set_ppr_med()
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+# define UT_LOW_PRIORITY_CPU() __asm__ __volatile__ ("or 1,1,1")
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+# define UT_RESUME_PRIORITY_CPU() __asm__ __volatile__ ("or 2,2,2")
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#else
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# define UT_LOW_PRIORITY_CPU() ((void)0)
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# define UT_RESUME_PRIORITY_CPU() ((void)0)
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