Merge tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic
Pul removal of obsolete architecture ports from Arnd Bergmann:
"This removes the entire architecture code for blackfin, cris, frv,
m32r, metag, mn10300, score, and tile, including the associated device
drivers.
I have been working with the (former) maintainers for each one to
ensure that my interpretation was right and the code is definitely
unused in mainline kernels. Many had fond memories of working on the
respective ports to start with and getting them included in upstream,
but also saw no point in keeping the port alive without any users.
In the end, it seems that while the eight architectures are extremely
different, they all suffered the same fate: There was one company in
charge of an SoC line, a CPU microarchitecture and a software
ecosystem, which was more costly than licensing newer off-the-shelf
CPU cores from a third party (typically ARM, MIPS, or RISC-V). It
seems that all the SoC product lines are still around, but have not
used the custom CPU architectures for several years at this point. In
contrast, CPU instruction sets that remain popular and have actively
maintained kernel ports tend to all be used across multiple licensees.
[ See the new nds32 port merged in the previous commit for the next
generation of "one company in charge of an SoC line, a CPU
microarchitecture and a software ecosystem" - Linus ]
The removal came out of a discussion that is now documented at
https://lwn.net/Articles/748074/. Unlike the original plans, I'm not
marking any ports as deprecated but remove them all at once after I
made sure that they are all unused. Some architectures (notably tile,
mn10300, and blackfin) are still being shipped in products with old
kernels, but those products will never be updated to newer kernel
releases.
After this series, we still have a few architectures without mainline
gcc support:
- unicore32 and hexagon both have very outdated gcc releases, but the
maintainers promised to work on providing something newer. At least
in case of hexagon, this will only be llvm, not gcc.
- openrisc, risc-v and nds32 are still in the process of finishing
their support or getting it added to mainline gcc in the first
place. They all have patched gcc-7.3 ports that work to some
degree, but complete upstream support won't happen before gcc-8.1.
Csky posted their first kernel patch set last week, their situation
will be similar
[ Palmer Dabbelt points out that RISC-V support is in mainline gcc
since gcc-7, although gcc-7.3.0 is the recommended minimum - Linus ]"
This really says it all:
2498 files changed, 95 insertions(+), 467668 deletions(-)
* tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: (74 commits)
MAINTAINERS: UNICORE32: Change email account
staging: iio: remove iio-trig-bfin-timer driver
tty: hvc: remove tile driver
tty: remove bfin_jtag_comm and hvc_bfin_jtag drivers
serial: remove tile uart driver
serial: remove m32r_sio driver
serial: remove blackfin drivers
serial: remove cris/etrax uart drivers
usb: Remove Blackfin references in USB support
usb: isp1362: remove blackfin arch glue
usb: musb: remove blackfin port
usb: host: remove tilegx platform glue
pwm: remove pwm-bfin driver
i2c: remove bfin-twi driver
spi: remove blackfin related host drivers
watchdog: remove bfin_wdt driver
can: remove bfin_can driver
mmc: remove bfin_sdh driver
input: misc: remove blackfin rotary driver
input: keyboard: remove bf54x driver
...
This commit is contained in:
Linus Torvalds
@@ -26,8 +26,8 @@ On what hardware does it run?
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Although originally developed first for 32-bit x86-based PCs (386 or higher),
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today Linux also runs on (at least) the Compaq Alpha AXP, Sun SPARC and
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UltraSPARC, Motorola 68000, PowerPC, PowerPC64, ARM, Hitachi SuperH, Cell,
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IBM S/390, MIPS, HP PA-RISC, Intel IA-64, DEC VAX, AMD x86-64, AXIS CRIS,
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Xtensa, Tilera TILE, ARC and Renesas M32R architectures.
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IBM S/390, MIPS, HP PA-RISC, Intel IA-64, DEC VAX, AMD x86-64 Xtensa, and
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ARC architectures.
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Linux is easily portable to most general-purpose 32- or 64-bit architectures
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as long as they have a paged memory management unit (PMMU) and a port of the
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@@ -89,7 +89,6 @@ parameter is applicable::
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APM Advanced Power Management support is enabled.
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ARM ARM architecture is enabled.
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AX25 Appropriate AX.25 support is enabled.
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BLACKFIN Blackfin architecture is enabled.
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CLK Common clock infrastructure is enabled.
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CMA Contiguous Memory Area support is enabled.
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DRM Direct Rendering Management support is enabled.
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@@ -1025,7 +1025,7 @@
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address. The serial port must already be setup
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and configured. Options are not yet supported.
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earlyprintk= [X86,SH,BLACKFIN,ARM,M68k,S390]
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earlyprintk= [X86,SH,ARM,M68k,S390]
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earlyprintk=vga
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earlyprintk=efi
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earlyprintk=sclp
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@@ -1347,10 +1347,6 @@
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If specified, z/VM IUCV HVC accepts connections
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from listed z/VM user IDs only.
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hwthread_map= [METAG] Comma-separated list of Linux cpu id to
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hardware thread id mappings.
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Format: <cpu>:<hwthread>
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keep_bootcon [KNL]
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Do not unregister boot console at start. This is only
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useful for debugging when something happens in the window
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