linux.git/arch/sparc/lib, branch v6.14

sparc/crc32: expose CRC32 functions through lib

2024-12-02T01:23:01+00:00

Move the sparc CRC32C assembly code into the lib directory and wire it
up to the library interface.  This allows it to be used without going
through the crypto API.  It remains usable via the crypto API too via
the shash algorithms that use the library interface.  Thus all the
arch-specific "shash" code becomes unnecessary and is removed.

Note: to see the diff from arch/sparc/crypto/crc32c_glue.c to
arch/sparc/lib/crc32_glue.c, view this commit with 'git show -M10'.

Reviewed-by: Ard Biesheuvel 
Link: https://lore.kernel.org/r/20241202010844.144356-11-ebiggers@kernel.org
Signed-off-by: Eric Biggers

sparc32: add __cmpxchg_u{8,16}() and teach __cmpxchg() to handle those sizes

2024-04-10T05:06:00+00:00

trivial now

Signed-off-by: Al Viro 
Signed-off-by: Paul E. McKenney

sparc32: unify __cmpxchg_u{32,64}

2024-04-10T05:06:00+00:00

Add a macro that expands to one of those when given u32 or u64
as an argument - atomic32.c has a lot of similar stuff already.

Signed-off-by: Al Viro 
Signed-off-by: Paul E. McKenney

sparc32: make the first argument of __cmpxchg_u64() volatile u64 *

2024-04-10T05:06:00+00:00

... to match all cmpxchg variants.

Signed-off-by: Al Viro 
Signed-off-by: Paul E. McKenney

sparc32: make __cmpxchg_u32() return u32

2024-04-10T05:06:00+00:00

Conversion between u32 and unsigned long is tautological there,
and the only use of return value is to return it from
__cmpxchg() (which return unsigned long).

Get rid of explicit casts in __cmpxchg_u32() call, while we are
at it - normal conversions for arguments will do just fine.

Signed-off-by: Al Viro 
Signed-off-by: Paul E. McKenney

sparc32: Use generic cmpdi2/ucmpdi2 variants

2024-03-08T20:20:23+00:00

Use the generic variants - the implementation is the same.
As a nice side-effect fix the following warnings:

cmpdi2.c: warning: no previous prototype for '__cmpdi2' [-Wmissing-prototypes]
ucmpdi2.c: warning: no previous prototype for '__ucmpdi2' [-Wmissing-prototypes]

Signed-off-by: Sam Ravnborg 
Fixes: 0fcb70851fbf ("Makefile.extrawarn: turn on missing-prototypes globally")
Reviewed-by: Randy Dunlap 
Tested-by: Randy Dunlap  # build-tested
Reviewed-by: Maciej W. Rozycki 
Tested-by: Maciej W. Rozycki  # build-tested
Cc: "David S. Miller" 
Cc: Andreas Larsson 
Reviewed-by: Andreas Larsson 
Tested-by: Andreas Larsson 
Signed-off-by: Andreas Larsson 
Link: https://lore.kernel.org/r/20240224-sam-fix-sparc32-all-builds-v2-1-1f186603c5c4@ravnborg.org

arch: turn off -Werror for architectures with known warnings

2023-12-11T01:21:33+00:00

A couple of architectures enable -Werror for their own files regardless of
CONFIG_WERROR but also have known warnings that fail the build with
-Wmissing-prototypes enabled by default:

arch/alpha/lib/memcpy.c:153:8: error: no previous prototype for 'memcpy' [-Werror=missing-prototypes]
arch/alpha/kernel/irq.c:96:1: error: no previous prototype for 'handle_irq' [-Werror=missing-prototypes]
arch/mips/kernel/signal.c:673:17: error: no previous prototype for ‘sys_rt_sigreturn’ [-Werror=missing-prototypes]
arch/mips/kernel/signal.c:636:17: error: no previous prototype for ‘sys_sigreturn’ [-Werror=missing-prototypes]
arch/mips/kernel/syscall.c:51:16: error: no previous prototype for ‘sysm_pipe’ [-Werror=missing-prototypes]
arch/mips/mm/fault.c:323:17: error: no previous prototype for ‘do_page_fault’ [-Werror=missing-prototypes]
arch/sparc/vdso/vma.c:246:12: warning: no previous prototype for ‘init_vdso_image’ [-Wmissing-prototypes]v
arch/sparc/vdso/vdso32/../vclock_gettime.c:343:1: warning: no previous prototype for ‘__vdso_gettimeofday_stick’ [-Wmissing-prototypes]
arch/sparc/vdso/vclock_gettime.c:343:1: warning: no previous prototype for ‘__vdso_gettimeofday_stick’ [-Wmissing-prototypes]
arch/sparc/prom/p1275.c:52:6: warning: no previous prototype for ‘prom_cif_init’ [-Wmissing-prototypes]
arch/sparc/prom/misc_64.c:165:5: warning: no previous prototype for ‘prom_get_mmu_ihandle’ [-Wmissing-prototypes]

This appears to be an artifact from the times when this architecture code
was better maintained that most device drivers and before CONFIG_WERROR
was added.  Now it just gets in the way, so remove all of these.

Powerpc and x86 both still have their own Kconfig options to enable
-Werror for some of their files.  These architectures are better
maintained than most and the options are easy to disable, so leave those
untouched.

Link: https://lkml.kernel.org/r/4be73872-c1f5-4c31-8201-712c19290a22@app.fastmail.com
Signed-off-by: Arnd Bergmann 
Reported-by: Stephen Rothwell 
Cc: "David S. Miller" 
Cc: Thomas Bogendoerfer 
Signed-off-by: Andrew Morton

sparc32: fix a braino in fault handling in csum_and_copy_..._user()

2023-10-28T00:06:06+00:00

Fault handler used to make non-trivial calls, so it needed
to set a stack frame up.  Used to be
	save ... - grab a stack frame, old %o... become %i...
	....
	ret	- go back to address originally in %o7, currently %i7
	 restore - switch to previous stack frame, in delay slot
Non-trivial calls had been gone since ab5e8b331244 and that code should
have become
	retl	- go back to address in %o7
	 clr %o0 - have return value set to 0
What it had become instead was
	ret	- go back to address in %i7 - return address of *caller*
	 clr %o0 - have return value set to 0
which is not good, to put it mildly - we forcibly return 0 from
csum_and_copy_{from,to}_iter() (which is what the call of that
thing had been inlined into) and do that without dropping the
stack frame of said csum_and_copy_..._iter().  Confuses the
hell out of the caller of csum_and_copy_..._iter(), obviously...

Reviewed-by: Sam Ravnborg 
Fixes: ab5e8b331244 "sparc32: propagate the calling conventions change down to __csum_partial_copy_sparc_generic()"
Signed-off-by: Al Viro

sparc: replace #include with #include

2023-08-22T09:12:25+00:00

Commit ddb5cdbafaaa ("kbuild: generate KSYMTAB entries by modpost")
deprecated , which is now a wrapper of .

Replace #include  with #include .

After all the  lines are converted,  and
 will be removed.

Signed-off-by: Masahiro Yamada 
Acked-by: Sam Ravnborg

bitops: wrap non-atomic bitops with a transparent macro

2022-07-01T02:52:41+00:00

In preparation for altering the non-atomic bitops with a macro, wrap
them in a transparent definition. This requires prepending one more
'_' to their names in order to be able to do that seamlessly. It is
a simple change, given that all the non-prefixed definitions are now
in asm-generic.
sparc32 already has several triple-underscored functions, so I had
to rename them ('___' -> 'sp32_').

Signed-off-by: Alexander Lobakin 
Reviewed-by: Marco Elver 
Reviewed-by: Andy Shevchenko 
Signed-off-by: Yury Norov