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| author | Will Deacon <will@kernel.org> | 2021-02-12 17:54:55 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-02-12 17:54:55 +0300 |
| commit | f96a816fa5e5b7bdbfc1802dfb7f8155df2746d0 (patch) | |
| tree | 837f1f2cb1f866362770ebca1d94814253d3276b /arch/arm64 | |
| parent | 88ddf0df1620c67c12f9a950cecf1dac99fb8e08 (diff) | |
| parent | d13c613f136c9090f3863c49b2306d57ab59feba (diff) | |
| download | linux-f96a816fa5e5b7bdbfc1802dfb7f8155df2746d0.tar.xz | |
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
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/assembler.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h index 8cded93f99c3..ca31594d3d6c 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -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 |