From: Chung-Lin Tang <chunglin_tang@mentor.com>
To: Valdis.Kletnieks@vt.edu, Ley Foon Tan <lftan@altera.com>
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org, lftan.linux@gmail.com,
cltang@codesourcery.com
Subject: Re: [PATCH v3 25/29] nios2: Module support
Date: Wed, 10 Sep 2014 15:29:25 +0800 [thread overview]
Message-ID: <540FFDD5.8000403@mentor.com> (raw)
In-Reply-To: <75377.1410297958@turing-police.cc.vt.edu>
On 14/9/10 5:25 AM, Valdis.Kletnieks@vt.edu wrote:
> On Mon, 08 Sep 2014 17:22:36 +0800, Ley Foon Tan said:
>> This patch adds support for loadable modules.
>>
>> Signed-off-by: Ley Foon Tan <lftan@altera.com>
>
>> +/*
>> + * Modules should NOT be allocated with kmalloc for (obvious) reasons.
>> + * But we do it for now to avoid relocation issues. CALL26/PCREL26 cannot reach
>> + * from 0x80000000 (vmalloc area) to 0xc00000000 (kernel) (kmalloc returns
>> + * addresses in 0xc0000000)
>> + */
>
> That's a nice scary comment to see. :)
>
> What's the long-term plan here?
>
We would probably need to add the ability to add trampolines in some
way, though this of course impairs a little performance. Or if the
default region of vmalloc can be configured to use the same 256MB region
as the kernel.
I wonder how MIPS (which has similar same-region call/jump instructions)
deals with this?
Chung-Lin
next prev parent reply other threads:[~2014-09-10 7:29 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-08 9:22 [PATCH v3 00/29] nios2 Linux kernel port Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 01/29] asm-generic: add generic futex for !CONFIG_SMP Ley Foon Tan
2014-09-23 10:20 ` LF.Tan
2014-09-23 10:20 ` LF.Tan
2014-09-23 10:40 ` Arnd Bergmann
2014-09-23 10:40 ` Arnd Bergmann
2014-09-24 10:18 ` Ley Foon Tan
2014-09-24 10:18 ` Ley Foon Tan
2014-09-24 10:40 ` Arnd Bergmann
2014-09-24 10:40 ` Arnd Bergmann
2014-09-24 10:57 ` Ley Foon Tan
2014-09-24 11:10 ` Arnd Bergmann
2014-09-24 11:10 ` Arnd Bergmann
2014-09-25 8:33 ` Ley Foon Tan
2014-09-25 8:33 ` Ley Foon Tan
2014-09-25 10:54 ` Arnd Bergmann
2014-09-25 10:54 ` Arnd Bergmann
2014-09-26 2:22 ` Ley Foon Tan
2014-09-26 2:22 ` Ley Foon Tan
2014-09-26 6:41 ` Geert Uytterhoeven
2014-09-26 6:41 ` Geert Uytterhoeven
2014-09-26 8:30 ` Ley Foon Tan
2014-09-26 13:17 ` Tobias Klauser
2014-09-26 13:17 ` Tobias Klauser
2014-09-26 13:33 ` Arnd Bergmann
2014-09-26 13:33 ` Arnd Bergmann
2014-09-23 21:47 ` Thomas Gleixner
2014-09-23 21:47 ` Thomas Gleixner
2014-09-24 10:29 ` Ley Foon Tan
2014-09-24 10:29 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 02/29] nios2: Assembly macros and definitions Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 03/29] nios2: Kernel booting and initialization Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 04/29] nios2: Exception handling Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 05/29] nios2: Traps exception handling Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 06/29] nios2: Memory management Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 07/29] nios2: I/O Mapping Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 08/29] nios2: MMU Fault handling Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 09/29] nios2: Page table management Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 10/29] nios2: Process management Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 11/29] nios2: Cache handling Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 12/29] nios2: TLB handling Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 13/29] nios2: Interrupt handling Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 14/29] nios2: DMA mapping API Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 15/29] Add ELF machine define for Nios2 Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 16/29] nios2: ELF definitions Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 17/29] nios2: System calls handling Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 18/29] nios2: Signal handling support Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 19/29] nios2: Library functions Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 20/29] nios2: Device tree support Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 21/29] nios2: Time keeping Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 22/29] nios2: Cpuinfo handling Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 23/29] nios2: Miscellaneous header files Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 24/29] nios2: Nios2 registers Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 25/29] nios2: Module support Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-09 21:25 ` Valdis.Kletnieks
2014-09-10 7:29 ` Chung-Lin Tang [this message]
2014-09-10 7:29 ` Chung-Lin Tang
2014-09-10 7:49 ` Tobias Klauser
2014-09-08 9:22 ` [PATCH v3 26/29] nios2: ptrace support Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-16 9:43 ` Tobias Klauser
2014-09-16 9:43 ` Tobias Klauser
2014-09-18 5:10 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 27/29] MAINTAINERS: Add nios2 maintainer Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 28/29] Documentation: Add documentation for Nios2 architecture Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-26 2:27 ` Ley Foon Tan
2014-09-26 2:27 ` Ley Foon Tan
2014-09-26 8:31 ` Ley Foon Tan
2014-09-08 9:22 ` [PATCH v3 29/29] nios2: Build infrastructure Ley Foon Tan
2014-09-08 9:22 ` Ley Foon Tan
2014-09-08 12:13 ` [PATCH v3 00/29] nios2 Linux kernel port David Howells
2014-09-09 2:02 ` Al Viro
2014-09-09 2:02 ` Al Viro
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