From: James Hogan <jhogan@kernel.org>
To: "Maciej W. Rozycki" <macro@mips.com>
Cc: Huacai Chen <chenhc@lemote.com>,
Ralf Baechle <ralf@linux-mips.org>,
"Steven J . Hill" <Steven.Hill@cavium.com>,
linux-mips@linux-mips.org, Fuxin Zhang <zhangfx@lemote.com>,
Zhangjin Wu <wuzhangjin@gmail.com>
Subject: Re: [PATCH V2 12/12] MIPS: Loongson: Introduce and use WAR_LLSC_MB
Date: Wed, 21 Feb 2018 11:43:26 +0000 [thread overview]
Message-ID: <20180221114326.GJ6245@saruman> (raw)
In-Reply-To: <alpine.DEB.2.00.1802202339250.3553@tp.orcam.me.uk>
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On Wed, Feb 21, 2018 at 10:09:06AM +0000, Maciej W. Rozycki wrote:
> On Tue, 20 Feb 2018, James Hogan wrote:
>
> > > diff --git a/arch/mips/loongson64/Platform b/arch/mips/loongson64/Platform
> > > index 0fce460..3700dcf 100644
> > > --- a/arch/mips/loongson64/Platform
> > > +++ b/arch/mips/loongson64/Platform
> > > @@ -23,6 +23,9 @@ ifdef CONFIG_CPU_LOONGSON2F_WORKAROUNDS
> > > endif
> > >
> > > cflags-$(CONFIG_CPU_LOONGSON3) += -Wa,--trap
> > > +ifneq ($(call as-option,-Wa$(comma)-mfix-loongson3-llsc,),)
> > > + cflags-$(CONFIG_CPU_LOONGSON3) += -Wa$(comma)-mno-fix-loongson3-llsc
> > > +endif
> >
> > Could this be a separate patch?
> >
> > This needs more explanation.
> > - What does this do exactly?
> > - Why are you turning *OFF* the compiler fix?
> > - Was some fix we don't want already in use by default?
>
> FYI, support for `-mfix-loongson3-llsc' in GAS has only recently been
> proposed: <https://sourceware.org/ml/binutils/2018-01/msg00303.html> and
> is still pending review.
Thanks for that link Maciej. GNU changelogs are useless, so this is the
interesting bit:
> +@item -mfix-loongson3-llsc
> +@itemx -mno-fix-loongson3-llsc
> +Insert @code{sync} instruction before @samp{ll} or @samp{lld} instrction
> +to work around Loongson3 @samp{LL}/@samp{SC} errata.
> +This issue exists in all Loongson3 CPUs.
Cheers
James
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next prev parent reply other threads:[~2018-02-21 11:43 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-27 3:12 [PATCH V2 00/12] MIPS: Loongson: new features and improvements Huacai Chen
2018-01-27 3:12 ` [PATCH V2 01/12] MIPS: Loongson: Add Loongson-3A R3.1 basic support Huacai Chen
2018-01-27 3:12 ` [PATCH V2 02/12] MIPS: Loongson64: Define and use some CP0 registers Huacai Chen
2018-02-15 11:36 ` James Hogan
2018-01-27 3:12 ` [PATCH V2 03/12] MIPS: Loongson-3: Enable Store Fill Buffer at runtime Huacai Chen
2018-02-15 12:43 ` James Hogan
2018-01-27 3:19 ` [PATCH V2 04/12] MIPS: c-r4k: Add r4k_blast_scache_node for Loongson-3 Huacai Chen
2018-02-19 22:19 ` James Hogan
2018-01-27 3:20 ` [PATCH V2 05/12] MIPS: Loongson fix name confict - MEM_RESERVED Huacai Chen
2018-01-27 3:21 ` [PATCH V2 06/12] MIPS: Ensure pmd_present() returns false after pmd_mknotpresent() Huacai Chen
2018-01-27 3:22 ` [PATCH V2 07/12] MIPS: Add __cpu_full_name[] to make CPU names more human-readable Huacai Chen
2018-01-27 3:22 ` [PATCH V2 08/12] MIPS: Align kernel load address to 64KB Huacai Chen
2018-02-19 23:07 ` James Hogan
2018-02-20 22:14 ` Maciej W. Rozycki
2018-02-20 22:14 ` Maciej W. Rozycki
2018-02-20 22:25 ` James Hogan
2018-02-20 22:25 ` James Hogan
2018-02-20 22:53 ` Maciej W. Rozycki
2018-02-20 22:53 ` Maciej W. Rozycki
2018-02-20 22:58 ` James Hogan
2018-02-20 22:58 ` James Hogan
2018-02-20 23:38 ` Maciej W. Rozycki
2018-02-20 23:38 ` Maciej W. Rozycki
2018-02-21 11:13 ` James Hogan
2018-02-21 11:13 ` James Hogan
2018-02-26 12:41 ` Maciej W. Rozycki
2018-02-26 12:41 ` Maciej W. Rozycki
2018-01-27 3:22 ` [PATCH V2 09/12] MIPS: Loongson: Add kexec/kdump support Huacai Chen
2018-02-19 23:54 ` James Hogan
2018-01-27 3:22 ` [PATCH V2 10/12] MIPS: Loongson: Make CPUFreq usable for Loongson-3 Huacai Chen
2018-01-27 3:23 ` [PATCH V2 11/12] MIPS: Loongson-3: Fix CPU UART irq delivery problem Huacai Chen
2018-02-20 21:49 ` James Hogan
2018-01-27 3:23 ` [PATCH V2 12/12] MIPS: Loongson: Introduce and use WAR_LLSC_MB Huacai Chen
2018-02-20 22:21 ` James Hogan
2018-02-21 10:09 ` Maciej W. Rozycki
2018-02-21 10:09 ` Maciej W. Rozycki
2018-02-21 11:43 ` James Hogan [this message]
2018-02-20 21:42 ` [PATCH V2 10/12] MIPS: Loongson: Make CPUFreq usable for Loongson-3 James Hogan
2018-02-15 11:05 ` [PATCH V2 00/12] MIPS: Loongson: new features and improvements James Hogan
2018-02-28 2:23 ` Huacai Chen
2018-02-28 10:03 ` James Hogan
2018-03-01 2:35 ` Huacai Chen
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