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From: David Laight <David.Laight@ACULAB.COM>
To: "'michael@michaelkloos.com'" <michael@michaelkloos.com>,
	"paul.walmsley@sifive.com" <paul.walmsley@sifive.com>,
	"palmer@dabbelt.com" <palmer@dabbelt.com>,
	"aou@eecs.berkeley.edu" <aou@eecs.berkeley.edu>
Cc: "linux-riscv@lists.infradead.org"
	<linux-riscv@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH v2] Fixed: Misaligned memory access.  Fixed pointer comparison.
Date: Sun, 23 Jan 2022 13:31:34 +0000	[thread overview]
Message-ID: <fed7ee473044432180c67b4adc0eb45d@AcuMS.aculab.com> (raw)
In-Reply-To: <20220123034518.3717116-1-michael@michaelkloos.com>

From: michael@michaelkloos.com
> Sent: 23 January 2022 03:45
> 
> Rewrote the riscv memmove() assembly implementation.  The
> previous implementation did not check memory alignment and it
> compared 2 pointers with a signed comparison.  The misaligned
> memory access would cause the kernel to crash on systems that
> did not emulate it in firmware and did not support it in hardware.
> Firmware emulation is slow and may not exist.  Additionally,
> hardware support may not exist and would likely still run slower
> than aligned accesses even if it did.  The RISC-V spec does not
> guarantee that support for misaligned memory accesses will exist.
> It should not be depended on.
...

From the way my email client display the patch I think it is
using both tabs and spaces for indentation.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)


WARNING: multiple messages have this Message-ID (diff)
From: David Laight <David.Laight@ACULAB.COM>
To: "'michael@michaelkloos.com'" <michael@michaelkloos.com>,
	"paul.walmsley@sifive.com" <paul.walmsley@sifive.com>,
	"palmer@dabbelt.com" <palmer@dabbelt.com>,
	"aou@eecs.berkeley.edu" <aou@eecs.berkeley.edu>
Cc: "linux-riscv@lists.infradead.org"
	<linux-riscv@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH v2] Fixed: Misaligned memory access.  Fixed pointer comparison.
Date: Sun, 23 Jan 2022 13:31:34 +0000	[thread overview]
Message-ID: <fed7ee473044432180c67b4adc0eb45d@AcuMS.aculab.com> (raw)
In-Reply-To: <20220123034518.3717116-1-michael@michaelkloos.com>

From: michael@michaelkloos.com
> Sent: 23 January 2022 03:45
> 
> Rewrote the riscv memmove() assembly implementation.  The
> previous implementation did not check memory alignment and it
> compared 2 pointers with a signed comparison.  The misaligned
> memory access would cause the kernel to crash on systems that
> did not emulate it in firmware and did not support it in hardware.
> Firmware emulation is slow and may not exist.  Additionally,
> hardware support may not exist and would likely still run slower
> than aligned accesses even if it did.  The RISC-V spec does not
> guarantee that support for misaligned memory accesses will exist.
> It should not be depended on.
...

From the way my email client display the patch I think it is
using both tabs and spaces for indentation.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

  reply	other threads:[~2022-01-23 13:31 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-23  3:45 [PATCH v2] Fixed: Misaligned memory access. Fixed pointer comparison Michael T. Kloos
2022-01-23  3:45 ` Michael T. Kloos
2022-01-23 13:31 ` David Laight [this message]
2022-01-23 13:31   ` David Laight
2022-01-23 16:53   ` Michael T. Kloos
2022-01-23 16:53     ` Michael T. Kloos
2022-01-23 22:35     ` David Laight
2022-01-23 22:35       ` David Laight
2022-01-23 23:03       ` Michael T. Kloos
2022-01-23 23:03         ` Michael T. Kloos
2022-01-23 15:44 ` Jessica Clarke
2022-01-23 15:44   ` Jessica Clarke
2022-01-23 17:15   ` Michael T. Kloos
2022-01-23 17:15     ` Michael T. Kloos
2022-01-24  9:21 ` David Laight
2022-01-24  9:21   ` David Laight
2022-01-24 19:19   ` Michael T. Kloos
2022-01-24 19:19     ` Michael T. Kloos
2022-01-24 22:28     ` David Laight
2022-01-24 22:28       ` David Laight
2022-01-24 13:38 ` kernel test robot

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