From: Arnd Bergmann <arnd@arndb.de>
To: afzal mohammed <afzal.mohd.ma@gmail.com>
Cc: Russell King <linux@armlinux.org.uk>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: ARM: static kernel in vmalloc space
Date: Tue, 12 May 2020 21:49:59 +0200 [thread overview]
Message-ID: <CAK8P3a1DQWG1+ab2+vQ2XCAKYxPUjJk5g3W3094j-adDXSQfzQ@mail.gmail.com> (raw)
In-Reply-To: <20200512104758.GA12980@afzalpc>
On Tue, May 12, 2020 at 12:48 PM afzal mohammed <afzal.mohd.ma@gmail.com> wrote:
>
> On Mon, May 11, 2020 at 05:29:29PM +0200, Arnd Bergmann wrote:
>
> > What do you currently do with the module address space?
>
> In the current setup, module address space was untouched, i.e. virtual
> address difference b/n text & module space is far greater than 32MB, at
> least > (2+768+16)MB and modules can't be loaded unless ARM_MODULE_PLTS
> is enabled (this was checked now)
>
> > easiest way is to just always put modules into vmalloc space, as we already
> > do with CONFIG_ARM_MODULE_PLTS when the special area gets full,
> > but that could be optimized once the rest works.
>
> Okay
Any idea which bit you want to try next? Creating a raw_copy_{from,to}_user()
based on get_user_pages()/kmap_atomic()/memcpy() is probably a good
next thing to do. I think it can be done one page at a time with only
checking for
get_fs(), access_ok(), and page permissions, while get_user()/put_user()
need to handle a few more corner cases.
Arnd
next prev parent reply other threads:[~2020-05-12 19:50 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-31 9:32 [PATCH 0/3] Highmem support for 32-bit RISC-V Eric Lin
2020-03-31 9:32 ` [PATCH 1/3] riscv/mm: Add pkmap region and CONFIG_HIGHMEM Eric Lin
2020-03-31 9:32 ` [PATCH 2/3] riscv/mm: Implement kmap() and kmap_atomic() Eric Lin
2020-03-31 9:32 ` [PATCH 3/3] riscv/mm: Add pkmap in print_vm_layout() Eric Lin
2020-04-02 9:31 ` [PATCH 0/3] Highmem support for 32-bit RISC-V Arnd Bergmann
2020-04-08 3:51 ` Alan Kao
2020-04-08 14:40 ` Arnd Bergmann
2020-04-14 15:17 ` afzal mohammed
2020-04-14 19:29 ` Arnd Bergmann
2020-04-15 13:54 ` afzal mohammed
2020-05-03 14:50 ` afzal mohammed
2020-05-03 20:20 ` Arnd Bergmann
2020-05-04 9:10 ` afzal mohammed
2020-05-04 11:27 ` Arnd Bergmann
2020-05-11 14:21 ` ARM: static kernel in vmalloc space (was Re: [PATCH 0/3] Highmem support for 32-bit RISC-V) afzal mohammed
2020-05-11 15:29 ` Arnd Bergmann
2020-05-12 10:47 ` ARM: static kernel in vmalloc space afzal mohammed
2020-05-12 19:49 ` Arnd Bergmann [this message]
2020-05-14 11:17 ` afzal mohammed
2020-05-14 12:41 ` Arnd Bergmann
2020-05-14 13:35 ` afzal mohammed
2020-05-14 14:44 ` afzal mohammed
2020-05-14 15:32 ` Arnd Bergmann
2020-05-16 6:06 ` afzal mohammed
2020-05-16 7:35 ` Arnd Bergmann
2020-06-07 12:59 ` ARM: vmsplit 4g/4g afzal mohammed
2020-06-07 16:11 ` Russell King - ARM Linux admin
2020-06-08 11:09 ` afzal mohammed
2020-06-10 10:10 ` Linus Walleij
2020-06-12 10:25 ` afzal mohammed
2020-06-15 9:11 ` Linus Walleij
2020-06-15 10:01 ` afzal mohammed
2020-06-07 19:26 ` Arnd Bergmann
2020-06-08 11:18 ` afzal mohammed
2020-06-08 14:43 ` Arnd Bergmann
2020-06-08 15:17 ` afzal mohammed
2020-06-09 12:15 ` afzal mohammed
2020-06-09 14:22 ` Arnd Bergmann
2020-05-14 16:25 ` ARM: static kernel in vmalloc space Russell King - ARM Linux admin
2020-05-14 21:12 ` Arnd Bergmann
2020-05-14 23:40 ` Russell King - ARM Linux admin
2020-05-15 15:41 ` Arnd Bergmann
2020-07-30 9:33 ` Linus Walleij
2020-07-30 10:17 ` Arnd Bergmann
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