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From:   Kristen Carlson Accardi <kristen@linux.intel.com>
To:     linux-kernel@vger.kernel.org, linux-sgx@vger.kernel.org,
        cgroups@vger.kernel.org, Jarkko Sakkinen <jarkko@kernel.org>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>
Cc:     Kristen Carlson Accardi <kristen@linux.intel.com>,
        Sean Christopherson <seanjc@google.com>
Subject: [RFC PATCH 13/20] x86/sgx: Prepare for multiple LRUs
Date:   Thu, 22 Sep 2022 10:10:50 -0700
Message-Id: <20220922171057.1236139-14-kristen@linux.intel.com>
In-Reply-To: <20220922171057.1236139-1-kristen@linux.intel.com>
References: <20220922171057.1236139-1-kristen@linux.intel.com>
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From: Sean Christopherson <sean.j.christopherson@intel.com>

Add sgx_can_reclaim() wrapper so that in a subsequent patch, multiple LRUs
can be used cleanly.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com>
Cc: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kernel/cpu/sgx/main.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
index 9f2cb264a347..ac49346302ed 100644
--- a/arch/x86/kernel/cpu/sgx/main.c
+++ b/arch/x86/kernel/cpu/sgx/main.c
@@ -386,10 +386,15 @@ static int sgx_reclaim_pages(int nr_to_scan, bool ignore_age)
 	return i;
 }
 
+static bool sgx_can_reclaim(void)
+{
+	return !list_empty(&sgx_global_lru.reclaimable);
+}
+
 static bool sgx_should_reclaim(unsigned long watermark)
 {
 	return atomic_long_read(&sgx_nr_free_pages) < watermark &&
-	       !list_empty(&sgx_global_lru.reclaimable);
+		sgx_can_reclaim();
 }
 
 /*
@@ -588,7 +593,7 @@ struct sgx_epc_page *sgx_alloc_epc_page(void *owner, bool reclaim)
 			break;
 		}
 
-		if (list_empty(&sgx_global_lru.reclaimable))
+		if (!sgx_can_reclaim())
 			return ERR_PTR(-ENOMEM);
 
 		if (!reclaim) {
-- 
2.37.3