linux.git/arch/sparc/lib, branch v5.14 Linux kernel source tree locking/atomic: sparc: move to ARCH_ATOMIC 2021-05-26T11:20:52+00:00 Mark Rutland mark.rutland@arm.com 2021-05-25T14:02:29+00:00 ff5b4f1ed580c59d1f26ddddc6b2622347571cec We'd like all architectures to convert to ARCH_ATOMIC, as once all architectures are converted it will be possible to make significant cleanups to the atomics headers, and this will make it much easier to generically enable atomic functionality (e.g. debug logic in the instrumented wrappers). As a step towards that, this patch migrates sparc to ARCH_ATOMIC. The arch code provides arch_{atomic,atomic64,xchg,cmpxchg}*(), and common code wraps these with optional instrumentation to provide the regular functions. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Will Deacon <will@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20210525140232.53872-31-mark.rutland@arm.com 
We'd like all architectures to convert to ARCH_ATOMIC, as once all
architectures are converted it will be possible to make significant
cleanups to the atomics headers, and this will make it much easier to
generically enable atomic functionality (e.g. debug logic in the
instrumented wrappers).

As a step towards that, this patch migrates sparc to ARCH_ATOMIC. The
arch code provides arch_{atomic,atomic64,xchg,cmpxchg}*(), and common
code wraps these with optional instrumentation to provide the regular
functions.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210525140232.53872-31-mark.rutland@arm.com
sparc32: switch copy_user.S away from range exception table entries 2021-01-04T01:05:17+00:00 Al Viro viro@zeniv.linux.org.uk 2020-07-16T14:19:37+00:00 c4da8e0dc6f7cec80f32af080cadf47c1753a2ab Those were the last range exception table entries, which will allow to get rid of a lot of weirdness. Emits the same code into .text. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
Those were the last range exception table entries, which will allow
to get rid of a lot of weirdness.  Emits the same code into .text.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
sparc32: get rid of range exception table entries in checksum_32.S 2021-01-04T01:05:16+00:00 Al Viro viro@zeniv.linux.org.uk 2020-07-14T21:33:55+00:00 cfd5fa7021a54b8ed9bad16246b6b34851fd48d1 trivial - we don't even look at instruction offsets in the handler Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
trivial - we don't even look at instruction offsets in the handler

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
sparc32: switch __bzero() away from range exception table entries 2021-01-04T01:05:15+00:00 Al Viro viro@zeniv.linux.org.uk 2020-07-14T21:27:56+00:00 df06c27ebd86af2b4c43f698c3d38b781dbc722d Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
sparc32: kill lookup_fault() 2021-01-04T01:05:14+00:00 Al Viro viro@zeniv.linux.org.uk 2020-07-14T19:12:34+00:00 5f99d33810b00666825784342868240e5790c704 No callers left. As the result we can kill * lookup_fault() itself * the kludge in do_sparc_fault() for passing the arguments for eventual lookup_fault() into exception handler and labels used by it * the last of magical exception table entries (in __clear_user()) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
No callers left.  As the result we can kill
	* lookup_fault() itself
	* the kludge in do_sparc_fault() for passing the
arguments for eventual lookup_fault() into exception handler and
labels used by it
	* the last of magical exception table entries (in __clear_user())

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
sparc32: don't bother with lookup_fault() in __bzero() 2021-01-04T01:05:13+00:00 Al Viro viro@zeniv.linux.org.uk 2020-07-14T19:10:46+00:00 e51ea5442996261d4bc3a5b934d27cc0ce6a991c Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[regression fix] really dumb fuckup in sparc64 __csum_partial_copy() changes 2020-12-08T21:37:47+00:00 Al Viro viro@zeniv.linux.org.uk 2020-12-08T21:37:47+00:00 6220e48d9640538ff700f2e7d24c2f9277555fd6 ~0U is -1, not 1 Reported-by: Anatoly Pugachev <matorola@gmail.com> Tested-by: Anatoly Pugachev <matorola@gmail.com> Fixes: fdf8bee96f9a "sparc64: propagate the calling convention changes down to __csum_partial_copy_...()" X-brown-paperbag: yes Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
~0U is -1, not 1

Reported-by: Anatoly Pugachev <matorola@gmail.com>
Tested-by: Anatoly Pugachev <matorola@gmail.com>
Fixes: fdf8bee96f9a "sparc64: propagate the calling convention changes down to __csum_partial_copy_...()"
X-brown-paperbag: yes
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
sparc64: propagate the calling convention changes down to __csum_partial_copy_...() 2020-08-20T19:45:21+00:00 Al Viro viro@zeniv.linux.org.uk 2020-07-19T22:31:07+00:00 fdf8bee96f9aeaac4559725c2dfae6e1bd7b7043 ... and rename them into csum_and_copy_...() - the wrappers become pointless. [braino fixed] Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
... and rename them into csum_and_copy_...() - the wrappers become pointless.
[braino fixed]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
sparc32: propagate the calling conventions change down to __csum_partial_copy_sparc_generic() 2020-08-20T19:45:19+00:00 Al Viro viro@zeniv.linux.org.uk 2020-07-13T19:12:48+00:00 ab5e8b33124468fe9d7d6042de5a9b35414c784e ... and get rid of zeroing the target, etc. on fault. All exception handlers merge into one; moreover, since we are not calling lookup_fault() anymore, we don't need the magic with passing arguments for it from the page fault handler. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
... and get rid of zeroing the target, etc. on fault.
All exception handlers merge into one; moreover, since we are not
calling lookup_fault() anymore, we don't need the magic with passing
arguments for it from the page fault handler.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
csum_partial_copy_nocheck(): drop the last argument 2020-08-20T19:45:14+00:00 Al Viro viro@zeniv.linux.org.uk 2020-07-11T04:12:07+00:00 cc44c17baf7f3f833d36b2f2a1edb1cc0b6f2cc4 It's always 0. Note that we theoretically could use ~0U as well - result will be the same modulo 0xffff, _if_ the damn thing did the right thing for any value of initial sum; later we'll make use of that when convenient. However, unlike csum_and_copy_..._user(), there are instances that did not work for arbitrary initial sums; c6x is one such. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
It's always 0.  Note that we theoretically could use ~0U as well -
result will be the same modulo 0xffff, _if_ the damn thing did the
right thing for any value of initial sum; later we'll make use of
that when convenient.

However, unlike csum_and_copy_..._user(), there are instances that
did not work for arbitrary initial sums; c6x is one such.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>