Commit f9c98d02 authored by Hugh Dickins's avatar Hugh Dickins Committed by Linus Torvalds
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[PATCH] mm: m68k kill stram swap 



Please, please now delete the Atari CONFIG_STRAM_SWAP code.  It may be
excellent and ingenious code, but its reference to swap_vfsmnt betrays that it
hasn't been built since 2.5.1 (four years old come December), it's delving
deep into matters which are the preserve of core mm code, its only purpose is
to give the more conscientious mm guys an anxiety attack from time to time;
yet we keep on breaking it more and more.

If you want to use RAM for swap, then if the MTD driver does not already
provide just what you need, I'm sure David could be persuaded to add the
extra.  But you'd also like to be able to allocate extents of that swap for
other use: we can give you a core interface for that if you need.  But unbuilt
for four years suggests to me that there's no need at all.

I cannot swear the patch below won't break your build, but believe so.

Signed-off-by: default avatarHugh Dickins <hugh@veritas.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 147efea8

Documentation/kernel-parameters.txt

+0 −2
Original line number Diff line number Diff line
@@ -1460,8 +1460,6 @@ running once the system is up. 
	stifb=		[HW]

			Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]]



	stram_swap=	[HW,M68k]



	swiotlb=	[IA-64] Number of I/O TLB slabs



	switches=	[HW,M68k]

Documentation/m68k/kernel-options.txt

+1 −23
Original line number Diff line number Diff line
@@ -626,7 +626,7 @@ ignored (others aren't affected). 
    can be performed in optimal order. Not all SCSI devices support

    tagged queuing (:-().



4.6 switches=

4.5 switches=

-------------



Syntax: switches=<list of switches>
@@ -661,28 +661,6 @@ correctly. 
earlier initialization ("ov_"-less) takes precedence. But the

switching-off on reset still happens in this case.



4.5) stram_swap=

----------------



Syntax: stram_swap=<do_swap>[,<max_swap>]



  This option is available only if the kernel has been compiled with

CONFIG_STRAM_SWAP enabled. Normally, the kernel then determines

dynamically whether to actually use ST-RAM as swap space. (Currently,

the fraction of ST-RAM must be less or equal 1/3 of total memory to

enable this swapping.) You can override the kernel's decision by

specifying this option. 1 for <do_swap> means always enable the swap,

even if you have less alternate RAM. 0 stands for never swap to

ST-RAM, even if it's small enough compared to the rest of memory.



  If ST-RAM swapping is enabled, the kernel usually uses all free

ST-RAM as swap "device". If the kernel resides in ST-RAM, the region

allocated by it is obviously never used for swapping :-) You can also

limit this amount by specifying the second parameter, <max_swap>, if

you want to use parts of ST-RAM as normal system memory. <max_swap> is

in kBytes and the number should be a multiple of 4 (otherwise: rounded

down).



5) Options for Amiga Only:

==========================

arch/m68k/Kconfig

+1 −23
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@@ -388,33 +388,11 @@ config AMIGA_PCMCIA 
	  Include support in the kernel for pcmcia on Amiga 1200 and Amiga

	  600. If you intend to use pcmcia cards say Y; otherwise say N.



config STRAM_SWAP

	bool "Support for ST-RAM as swap space"

	depends on ATARI && BROKEN

	---help---

	  Some Atari 68k machines (including the 520STF and 1020STE) divide

	  their addressable memory into ST and TT sections.  The TT section

	  (up to 512MB) is the main memory; the ST section (up to 4MB) is

	  accessible to the built-in graphics board, runs slower, and is

	  present mainly for backward compatibility with older machines.



	  This enables support for using (parts of) ST-RAM as swap space,

	  instead of as normal system memory. This can first enhance system

	  performance if you have lots of alternate RAM (compared to the size

	  of ST-RAM), because executable code always will reside in faster

	  memory. ST-RAM will remain as ultra-fast swap space. On the other

	  hand, it allows much improved dynamic allocations of ST-RAM buffers

	  for device driver modules (e.g. floppy, ACSI, SLM printer, DMA

	  sound). The probability that such allocations at module load time

	  fail is drastically reduced.



config STRAM_PROC

	bool "ST-RAM statistics in /proc"

	depends on ATARI

	help

	  Say Y here to report ST-RAM usage statistics in /proc/stram.  See

	  the help for CONFIG_STRAM_SWAP for discussion of ST-RAM and its

	  uses.

	  Say Y here to report ST-RAM usage statistics in /proc/stram.



config HEARTBEAT

	bool "Use power LED as a heartbeat" if AMIGA || APOLLO || ATARI || MAC ||Q40

arch/m68k/atari/stram.c

+15 −903

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