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Date:   Tue, 23 Feb 2021 01:18:11 +0200
From:   dm9pZCAq <v@0x0c.xyz>
To:     linux-crypto@vger.kernel.org
Cc:     Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH] crypto: jitterentropy: Add automatically deoptimization.
Message-ID: <20210222230023.eflhc5ktynpqy7uy@gentoo>
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This is needed to compile with `CFLAGS_KERNEL=-O2`.

Due to `CFLAGS_jitterentropy.o = -O0` comes after `CFLAGS_KERNEL`
the code is still optimized and gives an error.
This patch deoptimizes the code despite any `CFLAGS`.

Signed-off-by: dm9pZCAq <v@0x0c.xyz>
---
 crypto/jitterentropy.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/crypto/jitterentropy.c b/crypto/jitterentropy.c
index 6e147c43fc18..7d84bc10626f 100644
--- a/crypto/jitterentropy.c
+++ b/crypto/jitterentropy.c
@@ -50,7 +50,14 @@
  * version 2.2.0 provided at https://www.chronox.de/jent.html
  */
 
-#ifdef __OPTIMIZE__
+
+#ifdef __clang__
+ #pragma clang optimize off
+#else
+ #pragma GCC optimize ("O0")
+#endif
+
+#if !defined(__clang__) && defined(__OPTIMIZE__)
  #error "The CPU Jitter random number generator must not be compiled with optimizations. See documentation. Use the compiler switch -O0 for compiling jitterentropy.c."
 #endif
 
-- 
2.30.1