From: afzal mohammed <afzal.mohd.ma@gmail.com>
To: Arnd Bergmann <arnd@arndb.de>
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: Thu, 14 May 2020 20:14:21 +0530 [thread overview]
Message-ID: <20200514144421.GA6090@afzalpc> (raw)
In-Reply-To: <20200514133545.GA5020@afzalpc>
Hi,
On Thu, May 14, 2020 at 07:05:45PM +0530, afzal mohammed wrote:
> So if we make VMSPLIT_4G_4G, depends on !HIGH_MEMORY (w/ mention of
> caveat in Kconfig help that this is meant for platforms w/ <=4GB), then
> we can do copy_{from,to}_user the same way currently do, and no need to
> do the user page pinning & kmap, right ?
i think user page pinning is still required, but kmap can be avoided
by using lowmem corresponding to that page, right ?, or am i
completely wrong ?
Regards
afzal
WARNING: multiple messages have this Message-ID (diff)
From: afzal mohammed <afzal.mohd.ma@gmail.com>
To: Arnd Bergmann <arnd@arndb.de>
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: Thu, 14 May 2020 20:14:21 +0530 [thread overview]
Message-ID: <20200514144421.GA6090@afzalpc> (raw)
In-Reply-To: <20200514133545.GA5020@afzalpc>
Hi,
On Thu, May 14, 2020 at 07:05:45PM +0530, afzal mohammed wrote:
> So if we make VMSPLIT_4G_4G, depends on !HIGH_MEMORY (w/ mention of
> caveat in Kconfig help that this is meant for platforms w/ <=4GB), then
> we can do copy_{from,to}_user the same way currently do, and no need to
> do the user page pinning & kmap, right ?
i think user page pinning is still required, but kmap can be avoided
by using lowmem corresponding to that page, right ?, or am i
completely wrong ?
Regards
afzal
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next prev parent reply other threads:[~2020-05-14 14:44 UTC|newest]
Thread overview: 89+ 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 ` 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 ` Eric Lin
2020-03-31 9:32 ` [PATCH 2/3] riscv/mm: Implement kmap() and kmap_atomic() Eric Lin
2020-03-31 9:32 ` Eric Lin
2020-03-31 9:32 ` [PATCH 3/3] riscv/mm: Add pkmap in print_vm_layout() Eric Lin
2020-03-31 9:32 ` Eric Lin
2020-04-02 9:31 ` [PATCH 0/3] Highmem support for 32-bit RISC-V Arnd Bergmann
2020-04-02 9:31 ` Arnd Bergmann
2020-04-08 3:51 ` Alan Kao
2020-04-08 3:51 ` Alan Kao
2020-04-08 14:40 ` Arnd Bergmann
2020-04-08 14:40 ` Arnd Bergmann
2020-04-14 15:17 ` afzal mohammed
2020-04-14 15:17 ` afzal mohammed
2020-04-14 19:29 ` Arnd Bergmann
2020-04-14 19:29 ` Arnd Bergmann
2020-04-15 13:54 ` afzal mohammed
2020-04-15 13:54 ` afzal mohammed
2020-05-03 14:50 ` afzal mohammed
2020-05-03 14:50 ` afzal mohammed
2020-05-03 20:20 ` Arnd Bergmann
2020-05-03 20:20 ` Arnd Bergmann
2020-05-04 9:10 ` afzal mohammed
2020-05-04 9:10 ` afzal mohammed
2020-05-04 9:10 ` afzal mohammed
2020-05-04 11:27 ` Arnd Bergmann
2020-05-04 11:27 ` Arnd Bergmann
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 14:21 ` afzal mohammed
2020-05-11 15:29 ` Arnd Bergmann
2020-05-11 15:29 ` Arnd Bergmann
2020-05-12 10:47 ` ARM: static kernel in vmalloc space afzal mohammed
2020-05-12 10:47 ` afzal mohammed
2020-05-12 19:49 ` Arnd Bergmann
2020-05-12 19:49 ` Arnd Bergmann
2020-05-14 11:17 ` afzal mohammed
2020-05-14 11:17 ` afzal mohammed
2020-05-14 12:41 ` Arnd Bergmann
2020-05-14 12:41 ` Arnd Bergmann
2020-05-14 13:35 ` afzal mohammed
2020-05-14 13:35 ` afzal mohammed
2020-05-14 14:44 ` afzal mohammed [this message]
2020-05-14 14:44 ` afzal mohammed
2020-05-14 15:32 ` Arnd Bergmann
2020-05-14 15:32 ` Arnd Bergmann
2020-05-16 6:06 ` afzal mohammed
2020-05-16 6:06 ` afzal mohammed
2020-05-16 7:35 ` Arnd Bergmann
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
2020-06-07 16:11 ` Russell King - ARM Linux admin
2020-06-08 11:09 ` afzal mohammed
2020-06-08 11:09 ` afzal mohammed
2020-06-10 10:10 ` Linus Walleij
2020-06-10 10:10 ` Linus Walleij
2020-06-12 10:25 ` afzal mohammed
2020-06-12 10:25 ` afzal mohammed
2020-06-15 9:11 ` Linus Walleij
2020-06-15 9:11 ` Linus Walleij
2020-06-15 10:01 ` afzal mohammed
2020-06-15 10:01 ` afzal mohammed
2020-06-07 19:26 ` Arnd Bergmann
2020-06-07 19:26 ` Arnd Bergmann
2020-06-08 11:18 ` afzal mohammed
2020-06-08 11:18 ` afzal mohammed
2020-06-08 14:43 ` Arnd Bergmann
2020-06-08 14:43 ` Arnd Bergmann
2020-06-08 15:17 ` afzal mohammed
2020-06-08 15:17 ` afzal mohammed
2020-06-09 12:15 ` afzal mohammed
2020-06-09 12:15 ` afzal mohammed
2020-06-09 14:22 ` Arnd Bergmann
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 16:25 ` Russell King - ARM Linux admin
2020-05-14 21:12 ` Arnd Bergmann
2020-05-14 21:12 ` Arnd Bergmann
2020-05-14 23:40 ` Russell King - ARM Linux admin
2020-05-14 23:40 ` Russell King - ARM Linux admin
2020-05-15 15:41 ` Arnd Bergmann
2020-05-15 15:41 ` Arnd Bergmann
2020-07-30 9:33 ` Linus Walleij
2020-07-30 9:33 ` Linus Walleij
2020-07-30 10:17 ` Arnd Bergmann
2020-07-30 10:17 ` Arnd Bergmann
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