From: Vineet Gupta <vineet.gupta1@synopsys.com>
To: Andrey Abramov <st5pub@yandex.ru>,
benh <benh@kernel.crashing.org>, paulus <paulus@samba.org>,
mpe <mpe@ellerman.id.au>, tglx <tglx@linutronix.de>,
mingo <mingo@redhat.com>, bp <bp@alien8.de>, hpa <hpa@zytor.com>,
x86 <x86@kernel.org>, mark <mark@fasheh.com>,
jlbec <jlbec@evilplan.org>, richard <richard@nod.at>,
dedekind1 <dedekind1@gmail.com>,
adrian.hunter <adrian.hunter@intel.com>,
gregkh <gregkh@linuxfoundation.org>,
naveen.n.rao <naveen.n.rao@linux.vnet.ibm.com>,
jpoimboe <jpoimboe@redhat.com>,
"Dave Chinner" <dchinner@redhat.com>,
darrick.wong <darrick.wong@oracle.com>,
ard.biesheuvel <ard.biesheuvel@linaro.org>,
George Spelvin <lkml@sdf.org>,
linux-snps-arc <linux-snps-arc@lists.infradead.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
ocfs2-devel <ocfs2-devel@oss.oracle.com>,
linux-mtd <linux-mtd@lists.infradead.org>,
sfr <sfr@canb.auug.org.au>
Cc: mhocko <mhocko@suse.com>, rppt <rppt@linux.ibm.com>
Subject: Re: [PATCH v2 1/5] arch/arc: unwind.c: replace swap function with built-in one
Date: Mon, 1 Apr 2019 17:53:20 +0000 [thread overview]
Message-ID: <C2D7FE5348E1B147BCA15975FBA23075014643F9C4@US01WEMBX2.internal.synopsys.com> (raw)
In-Reply-To: 23405591554057090@iva8-b333b7f98ab0.qloud-c.yandex.net
On 3/31/19 11:31 AM, Andrey Abramov wrote:
> Replace swap_eh_frame_hdr_table_entries with built-in one, because
> swap_eh_frame_hdr_table_entries does a simple byte to byte swap.
>
> Since Spectre mitigations have made indirect function calls more
> expensive, and the default simple byte copies swap is implemented
> without them, an "optimized" custom swap function is now
> a waste of time as well as code.
>
> Signed-off-by: Andrey Abramov <st5pub@yandex.ru>
> Reviewed by: George Spelvin <lkml@sdf.org>
>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Thx,
-Vineet
WARNING: multiple messages have this Message-ID (diff)
From: Vineet Gupta <vineet.gupta1@synopsys.com>
To: Andrey Abramov <st5pub@yandex.ru>,
benh <benh@kernel.crashing.org>, paulus <paulus@samba.org>,
mpe <mpe@ellerman.id.au>, tglx <tglx@linutronix.de>,
mingo <mingo@redhat.com>, bp <bp@alien8.de>, hpa <hpa@zytor.com>,
x86 <x86@kernel.org>, mark <mark@fasheh.com>,
jlbec <jlbec@evilplan.org>, richard <richard@nod.at>,
dedekind1 <dedekind1@gmail.com>,
adrian.hunter <adrian.hunter@intel.com>,
gregkh <gregkh@linuxfoundation.org>,
naveen.n.rao <naveen.n.rao@linux.vnet.ibm.com>,
jpoimboe <jpoimboe@redhat.com>,
"Dave Chinner" <dchinner@redhat.com>,
darrick.wong <darrick.wong@oracle.com>,
ard.biesheuvel <ard.biesheuvel@linaro.org>,
George Spelvin <lkml@sdf.org>,
linux-snps-arc <linux-snps-arc@lists.infradead.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
ocfs2-devel <ocfs2-devel@oss.oracle.com>,
linux-mtd <linux-mtd@lists.infradead.org>,
sfr <sfr@canb.auug.org.au>
Cc: mhocko <mhocko@suse.com>, rppt <rppt@linux.ibm.com>
Subject: Re: [PATCH v2 1/5] arch/arc: unwind.c: replace swap function with built-in one
Date: Mon, 1 Apr 2019 17:53:20 +0000 [thread overview]
Message-ID: <C2D7FE5348E1B147BCA15975FBA23075014643F9C4@US01WEMBX2.internal.synopsys.com> (raw)
In-Reply-To: 23405591554057090@iva8-b333b7f98ab0.qloud-c.yandex.net
On 3/31/19 11:31 AM, Andrey Abramov wrote:
> Replace swap_eh_frame_hdr_table_entries with built-in one, because
> swap_eh_frame_hdr_table_entries does a simple byte to byte swap.
>
> Since Spectre mitigations have made indirect function calls more
> expensive, and the default simple byte copies swap is implemented
> without them, an "optimized" custom swap function is now
> a waste of time as well as code.
>
> Signed-off-by: Andrey Abramov <st5pub@yandex.ru>
> Reviewed by: George Spelvin <lkml@sdf.org>
>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Thx,
-Vineet
______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/
WARNING: multiple messages have this Message-ID (diff)
From: vineet.gupta1@synopsys.com (Vineet Gupta)
To: linux-snps-arc@lists.infradead.org
Subject: [PATCH v2 1/5] arch/arc: unwind.c: replace swap function with built-in one
Date: Mon, 1 Apr 2019 17:53:20 +0000 [thread overview]
Message-ID: <C2D7FE5348E1B147BCA15975FBA23075014643F9C4@US01WEMBX2.internal.synopsys.com> (raw)
In-Reply-To: 23405591554057090@iva8-b333b7f98ab0.qloud-c.yandex.net
On 3/31/19 11:31 AM, Andrey Abramov wrote:
> Replace swap_eh_frame_hdr_table_entries with built-in one, because
> swap_eh_frame_hdr_table_entries does a simple byte to byte swap.
>
> Since Spectre mitigations have made indirect function calls more
> expensive, and the default simple byte copies swap is implemented
> without them, an "optimized" custom swap function is now
> a waste of time as well as code.
>
> Signed-off-by: Andrey Abramov <st5pub at yandex.ru>
> Reviewed by: George Spelvin <lkml at sdf.org>
>
Acked-by: Vineet Gupta <vgupta at synopsys.com>
Thx,
-Vineet
next prev parent reply other threads:[~2019-04-01 17:55 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-31 18:28 [PATCH v2 0/5] simple sort swap function improvements Andrey Abramov
2019-03-31 18:28 ` Andrey Abramov
2019-03-31 18:28 ` Andrey Abramov
2019-03-31 18:31 ` [PATCH v2 1/5] arch/arc: unwind.c: replace swap function with built-in one Andrey Abramov
2019-03-31 18:31 ` Andrey Abramov
2019-03-31 18:31 ` Andrey Abramov
2019-04-01 17:53 ` Vineet Gupta [this message]
2019-04-01 17:53 ` Vineet Gupta
2019-04-01 17:53 ` Vineet Gupta
2019-03-31 18:35 ` [PATCH v2 2/5] powerpc: module_[32|64].c: " Andrey Abramov
2019-03-31 18:35 ` Andrey Abramov
2019-03-31 18:35 ` Andrey Abramov
2019-04-01 11:08 ` Michael Ellerman
2019-04-01 11:08 ` Michael Ellerman
2019-04-01 11:08 ` Michael Ellerman
2019-04-01 11:08 ` Michael Ellerman
2019-03-31 18:42 ` [PATCH v2 3/5] ocfs2: dir, refcounttree, xattr: replace swap functions " Andrey Abramov
2019-03-31 18:42 ` Andrey Abramov
2019-03-31 18:42 ` Andrey Abramov
2019-03-31 18:47 ` [PATCH v2 4/5] ubifs: find.c: replace swap function " Andrey Abramov
2019-03-31 18:47 ` Andrey Abramov
2019-03-31 18:47 ` Andrey Abramov
2019-03-31 18:52 ` [PATCH v2 5/5] Lib: sort.h: replace int size with size_t size in the swap function Andrey Abramov
2019-03-31 18:52 ` Andrey Abramov
2019-03-31 18:52 ` Andrey Abramov
2019-04-01 9:35 ` Andy Shevchenko
2019-04-01 9:35 ` Andy Shevchenko
2019-04-01 9:35 ` Andy Shevchenko
2019-04-01 9:35 ` Andy Shevchenko
2019-04-01 9:56 ` George Spelvin
2019-04-01 9:56 ` George Spelvin
2019-04-01 9:56 ` George Spelvin
2019-04-01 9:56 ` George Spelvin
2019-04-01 10:28 ` Andy Shevchenko
2019-04-01 10:28 ` Andy Shevchenko
2019-04-01 10:28 ` Andy Shevchenko
2019-04-01 10:28 ` Andy Shevchenko
2019-04-01 9:25 ` [PATCH v2 0/5] simple sort swap function improvements Andy Shevchenko
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