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Merge branch 'for-next/crypto' into for-next/core 

Introduce a new macro to allow yielding the vector unit if preemption
is required. The initial users of this are being merged via the crypto
tree for 5.12.

* for-next/crypto:
  arm64: assembler: add cond_yield macro
This commit is contained in:
Will Deacon 2021-02-12 14:54:55 +00:00
parent 88ddf0df16 d13c613f13
commit f96a816fa5
1 changed files with 16 additions and 0 deletions
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16
arch/arm64/include/asm/assembler.h
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@ -762,6 +762,22 @@ USER(\label, ic ivau, \tmp2) // invalidate I line PoU
.Lyield_out_\@ :
.endm
/*
* Check whether preempt-disabled code should yield as soon as it
* is able. This is the case if re-enabling preemption a single
* time results in a preempt count of zero, and the TIF_NEED_RESCHED
* flag is set. (Note that the latter is stored negated in the
* top word of the thread_info::preempt_count field)
*/
.macro cond_yield, lbl:req, tmp:req
#ifdef CONFIG_PREEMPTION
get_current_task \tmp
ldr \tmp, [\tmp, #TSK_TI_PREEMPT]
sub \tmp, \tmp, #PREEMPT_DISABLE_OFFSET
cbz \tmp, \lbl
#endif
.endm
/*
* This macro emits a program property note section identifying
* architecture features which require special handling, mainly for