From: Marcelo Tosatti <marcelo@kvack.org>
To: Christoph Lameter <clameter@engr.sgi.com>,
Andi Kleen <ak@suse.de>, Arjan van de Ven <arjan@infradead.org>,
Arnd Bergmann <arnd@arndb.de>
Cc: linux-mm@kvack.org
Subject: [PATCH 1/2] optional GENERIC_ISA_DMA
Date: Thu, 28 Dec 2006 23:05:55 -0200 [thread overview]
Message-ID: <20061229010555.GA1116@dmt> (raw)
The following patch makes CONFIG_GENERIC_ISA_DMA/ISA_DMA_API a configure
option.
Newer/embedded systems usually do not have an ISA bus: kernel/dma.o and
arch/i386/kernel/i8237.o are dead code on such systems.
This is a preparation for the second patch: allow ZONE_DMA to be unset
on x86.
Against 2.6.20-rc2-mm1, on top of Christoph's ZONE_DMA work.
--- ./arch/i386/kernel/Makefile.orig 2006-12-28 22:56:50.000000000 -0200
+++ ./arch/i386/kernel/Makefile 2006-12-28 22:56:58.000000000 -0200
@@ -7,13 +7,14 @@
obj-y := process.o signal.o entry.o traps.o irq.o \
ptrace.o time.o ioport.o ldt.o setup.o i8259.o sys_i386.o \
pci-dma.o i386_ksyms.o i387.o bootflag.o e820.o\
- quirks.o i8237.o topology.o alternative.o i8253.o tsc.o
+ quirks.o topology.o alternative.o i8253.o tsc.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-y += cpu/
obj-y += acpi/
obj-$(CONFIG_X86_BIOS_REBOOT) += reboot.o
obj-$(CONFIG_MCA) += mca.o
+obj-$(CONFIG_GENERIC_ISA_DMA) += i8237.o
obj-$(CONFIG_X86_MSR) += msr.o
obj-$(CONFIG_X86_CPUID) += cpuid.o
obj-$(CONFIG_MICROCODE) += microcode.o
--- ./arch/i386/Kconfig.orig 2006-12-28 22:56:43.000000000 -0200
+++ ./arch/i386/Kconfig 2006-12-28 22:58:14.000000000 -0200
@@ -53,10 +53,6 @@
config SBUS
bool
-config GENERIC_ISA_DMA
- bool
- default y
-
config GENERIC_IOMAP
bool
default y
@@ -1134,11 +1130,12 @@
config ISA_DMA_API
bool
- default y
+ default n
config ISA
bool "ISA support"
depends on !(X86_VOYAGER || X86_VISWS)
+ select GENERIC_ISA_DMA
help
Find out whether you have ISA slots on your motherboard. ISA is the
name of a bus system, i.e. the way the CPU talks to the other stuff
@@ -1146,6 +1143,21 @@
(MCA) or VESA. ISA is an older system, now being displaced by PCI;
newer boards don't support it. If you have ISA, say Y, otherwise N.
+config GENERIC_ISA_DMA
+ bool "ISA DMA API"
+ select ISA_DMA_API
+ default y
+ help
+ This enables support for the ISA DMA API, which provides DMA
+ channel management. Its automatically selected by CONFIG_ISA.
+
+ Say N here if you do not have ISA devices on your x86 system.
+ Doing so might disable the DMA zone (0-16MiB), which simplifies
+ virtual memory management.
+
+ If unsure, say Y.
+
+
config EISA
bool "EISA support"
depends on ISA
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
reply other threads:[~2006-12-29 1:05 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly 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=20061229010555.GA1116@dmt \
--to=marcelo@kvack.org \
--cc=ak@suse.de \
--cc=arjan@infradead.org \
--cc=arnd@arndb.de \
--cc=clameter@engr.sgi.com \
--cc=linux-mm@kvack.org \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox