LKML Archive on lore.kernel.org
 help / color / Atom feed
From: Guenter Roeck <linux@roeck-us.net>
To: Palmer Dabbelt <palmer@sifive.com>
Cc: Christoph Hellwig <hch@infradead.org>,
	aou@eecs.berkeley.edu, Arnd Bergmann <arnd@arndb.de>,
	tklauser@distanz.ch, Andrew Waterman <andrew@sifive.com>,
	dan.carpenter@oracle.com, linux@dominikbrodowski.net,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	marcus@mc.pp.se
Subject: Re: [PATCH v2 2/2] RISC-V: Don't use a global include guard for uapi/asm/syscalls.h
Date: Thu, 9 Aug 2018 21:11:34 -0700
Message-ID: <988c739c-a275-c018-2502-08f817b2f818@roeck-us.net> (raw)
In-Reply-To: <mhng-ef018453-7a99-48b3-bda5-5408383d9566@palmer-si-x1c4>

On 08/09/2018 08:59 PM, Palmer Dabbelt wrote:
> On Thu, 09 Aug 2018 19:40:55 PDT (-0700), linux@roeck-us.net wrote:
>> On 08/09/2018 06:03 PM, Palmer Dabbelt wrote:
>>> On Thu, 09 Aug 2018 14:24:22 PDT (-0700), linux@roeck-us.net wrote:
>>>> On Thu, Aug 09, 2018 at 01:25:24PM -0700, Palmer Dabbelt wrote:
>>>>> This file is expected to be included multiple times in the same file in
>>>>> order to allow the __SYSCALL macro to generate system call tables.  With
>>>>> a global include guard we end up missing __NR_riscv_flush_icache in the
>>>>> syscall table, which results in icache flushes that escape the vDSO call
>>>>> to not actually do anything.
>>>>>
>>>>> The fix is to move to per-#define include guards, which allows the
>>>>> system call tables to actually be populated.  Thanks to Macrus Comstedt
>>>>> for finding and fixing the bug!
>>>>>
>>>>> I also went ahead and fixed the SPDX header to use a //-style comment,
>>>>> which I've been told is the canonical way to do it.
>>>>>
>>>>> Cc: Marcus Comstedt <marcus@mc.pp.se>
>>>>> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
>>>>
>>>> [Compile-]Tested-by: Guenter Roeck <linux@roeck-us.net>
>>>>
>>>> on top of linux-next after reverting the version of the patch there.
>>>>
>>>> I also tried to run the resulting image (defconfig) with qemu (built
>>>> from https://github.com/riscv/riscv-qemu.git), but that still doesn't
>>>> work. I assume there are still some patches missing ?
>>>
>>> Do you have the PLIC patches?  They'll be necessary to make this all work, and there's a v4 out now that when combined with for-next should get you to userspace.
>>>
>>>     https://lore.kernel.org/lkml/20180809075602.989-1-hch@lst.de/T/#u
>>>
>> Yes, after merging that branch on top of linux-next I can boot into Linux.
>> If I add my "riscv: Drop setup_initrd" patch as well, I can boot using
>> initrd, otherwise I have to use virtio-blk-device.
> 
> Awesome!  If you patch isn't on for-next then I must have missed it, do you mind sending me a pointer?  I can't find any references in my email.
> 
Hmm ... weird. I don't find it either. Maybe I sent it only in my dreams.
I'll send it out for review.

Guenter

>>> Also, what is your methodology?  I follow
>>>
>>>     https://wiki.qemu.org/Documentation/Platforms/RISCV
>>>
>>> and could could natively compile and run hello world with an earlier version of Christoph's patch set, which is really only cosmetically different than the v4. I use qemu's master branch as well, which when I tried was exactly 3.0.0-rc3.
>>>
>>
>> That doesn't work for me, possibly because I don't specify a bbl
>> image with -kernel but vmlinux (using -bios for the bbl image).
>> I use branch qemu-for-upstream of https://github.com/riscv/riscv-qemu.git.
>>
>> Guenter
> 


  reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-09 20:25 [PATCH v2 0/2] RISC-V: Don't use a global include guard for uapi/asm/syscalls Palmer Dabbelt
2018-08-09 20:25 ` [PATCH v2 1/2] RISC-V: Define sys_riscv_flush_icache when SMP=n Palmer Dabbelt
2018-08-09 21:20   ` Guenter Roeck
2018-08-09 20:25 ` [PATCH v2 2/2] RISC-V: Don't use a global include guard for uapi/asm/syscalls.h Palmer Dabbelt
2018-08-09 21:24   ` Guenter Roeck
2018-08-10  1:03     ` Palmer Dabbelt
2018-08-10  2:40       ` Guenter Roeck
2018-08-10  3:59         ` Palmer Dabbelt
2018-08-10  4:11           ` Guenter Roeck [this message]
2018-08-10  4:53           ` Guenter Roeck

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=988c739c-a275-c018-2502-08f817b2f818@roeck-us.net \
    --to=linux@roeck-us.net \
    --cc=andrew@sifive.com \
    --cc=aou@eecs.berkeley.edu \
    --cc=arnd@arndb.de \
    --cc=dan.carpenter@oracle.com \
    --cc=hch@infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-riscv@lists.infradead.org \
    --cc=linux@dominikbrodowski.net \
    --cc=marcus@mc.pp.se \
    --cc=palmer@sifive.com \
    --cc=tklauser@distanz.ch \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org linux-kernel@archiver.kernel.org
	public-inbox-index lkml


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/ public-inbox