From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Tue, 12 Jul 2016 05:17:56 +0000 (+0800)
Subject: crypto: api - Optimise away crypto_yield when hard preemption is on
X-Git-Tag: v4.8-rc1~165^2~15
X-Git-Url: http://git.cascardo.info/?p=cascardo%2Flinux.git;a=commitdiff_plain;h=4140139734459db4dffc50dad7b9e21ed79a8dd9

crypto: api - Optimise away crypto_yield when hard preemption is on

When hard preemption is enabled there is no need to explicitly
call crypto_yield.  This patch eliminates it if that is the case.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index 0483f652ac27..8637cdfe382a 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -442,8 +442,10 @@ static inline int crypto_memneq(const void *a, const void *b, size_t size)
 
 static inline void crypto_yield(u32 flags)
 {
+#if !defined(CONFIG_PREEMPT) || defined(CONFIG_PREEMPT_VOLUNTARY)
 	if (flags & CRYPTO_TFM_REQ_MAY_SLEEP)
 		cond_resched();
+#endif
 }
 
 #endif	/* _CRYPTO_ALGAPI_H */