wireguard-linux/arch/xtensa/include/asm/cmpxchg.h, branch jd/unified-crypt-queue

xtensa: use "m" constraint instead of "a" in cmpxchg.h assembly

2019-11-26T19:33:39Z

Use "m" constraint instead of "r" for the address, as "m" allows compiler to access adjacent locations using base + offset, while "r" requires updating the base register every time. Signed-off-by: Max Filippov

xtensa: use named assembly arguments in cmpxchg.h

2019-11-26T19:33:39Z

Numeric assembly arguments are hard to understand and assembly code that uses them is hard to modify. Use named arguments in __cmpxchg_u32 and xchg_u32. Signed-off-by: Max Filippov

xtensa: add exclusive atomics support

2019-05-07T17:36:31Z

Implement atomic primitives using exclusive access opcodes available in the recent xtensa cores. Since l32ex/s32ex don't have any memory ordering guarantees don't define __smp_mb__before_atomic/__smp_mb__after_atomic to make them use memw. Signed-off-by: Max Filippov

xtensa: provide xchg for sizes 1 and 2

2019-02-07T20:24:17Z

This is required for generic queued spinlocks, implement it. Signed-off-by: Max Filippov

xtensa: implement fake NMI

2015-08-17T04:33:39Z

In case perf IRQ is the highest of the medium-level IRQs, and is alone on its level, it may be treated as NMI: - LOCKLEVEL is defined to be one level less than EXCM level, - IRQ masking never lowers current IRQ level, - new fake exception cause code, EXCCAUSE_MAPPED_NMI is assigned to that IRQ; new second level exception handler, do_nmi, assigned to it handles it as NMI, - atomic operations in configurations without s32c1i still need to mask all interrupts. Cc: Peter Zijlstra Acked-by: Peter Zijlstra (Intel) Signed-off-by: Max Filippov

arch: xtensa: include: asm: compiling issue, need cmpxchg64() defined.

2013-06-05T17:14:21Z

When compiling with 'allmodconfig', some of drivers need cmpxchg64(), xtensa does not supply 64-bit implementation for 'xchg', so use the 'generic' implementation. e.g. (for next-20130527 tree): drivers/block/blockconsole.c:164:2: error: implicit declaration of function ‘cmpxchg64’ [-Werror=implicit-function-declaration] Signed-off-by: Chen Gang Signed-off-by: Max Filippov Signed-off-by: Chris Zankel

xtensa: clean up files to make them code-style compliant

2012-12-19T05:10:25Z

Remove heading and trailing spaces, trim trailing lines, and wrap lines that are longer than 80 characters. Signed-off-by: Chris Zankel

xtensa: add s32c1i-based atomic ops implementations

2012-12-19T05:10:22Z

Signed-off-by: Max Filippov Signed-off-by: Chris Zankel

xtensa: reorganize SR referencing

2012-10-16T04:48:08Z

- reference SRs by names where possible, not by numbers; - get rid of __stringify around SR names where possible; - remove unneeded SR names from asm/regs.h; - add SREG_ prefix to remaining SR names; Signed-off-by: Max Filippov Signed-off-by: Chris Zankel

Disintegrate asm/system.h for Xtensa

2012-03-28T17:30:03Z

Disintegrate asm/system.h for Xtensa. Signed-off-by: David Howells cc: Chris Zankel