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From: David Gibson <david@gibson.dropbear.id.au>
To: thuth@redhat.com, groug@kaod.org, peter.maydell@linaro.org,
	balaton@eik.bme.hu
Cc: qemu-ppc@nongnu.org, qemu-devel@nongnu.org,
	David Gibson <david@gibson.dropbear.id.au>
Subject: [Qemu-devel] [PATCH] target/ppc: Initialize lazy_tlb_flush correctly
Date: Tue, 20 Mar 2018 13:03:45 +1100	[thread overview]
Message-ID: <20180320020345.24930-1-david@gibson.dropbear.id.au> (raw)

ppc_tr_init_disas_context() correctly sets lazy_tlb_flush to true on
certain CPU models.  However, it leaves it uninitialized, instead of
setting it to false on all others.

It wasn't caught before now because we didn't have examples in the tests
that exercised this path.  However it can now be caught using clang's
undefined behaviour sanitizer and the sam460ex board.

Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 target/ppc/translate.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index 218665b408..3457d29f8e 100644
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -7237,10 +7237,9 @@ static int ppc_tr_init_disas_context(DisasContextBase *dcbase,
     ctx->sf_mode = msr_is_64bit(env, env->msr);
     ctx->has_cfar = !!(env->flags & POWERPC_FLAG_CFAR);
 #endif
-    if (env->mmu_model == POWERPC_MMU_32B ||
-        env->mmu_model == POWERPC_MMU_601 ||
-        (env->mmu_model & POWERPC_MMU_64B))
-            ctx->lazy_tlb_flush = true;
+    ctx->lazy_tlb_flush = env->mmu_model == POWERPC_MMU_32B
+        || env->mmu_model == POWERPC_MMU_601
+        || (env->mmu_model & POWERPC_MMU_64B);
 
     ctx->fpu_enabled = !!msr_fp;
     if ((env->flags & POWERPC_FLAG_SPE) && msr_spe)
-- 
2.14.3

             reply	other threads:[~2018-03-20  2:03 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-20  2:03 David Gibson [this message]
2018-03-20 10:12 ` [Qemu-devel] [PATCH] target/ppc: Initialize lazy_tlb_flush correctly Thomas Huth
2018-03-20 10:22 ` Greg Kurz

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