From: Sameer Goel <sameer.goel@linaro.org>
To: xen-devel@lists.xenproject.org, julien.grall@arm.com,
mjaggi@caviumnetworks.com
Cc: sstabellini@kernel.org, wei.liu2@citrix.com,
george.dunlap@eu.citrix.com, Andrew.Cooper3@citrix.com,
jbeulich@suse.com, Sameer Goel <sameer.goel@linaro.org>,
Ian.Jackson@citrix.com, nd@arm.com, shankerd@codeaurora.org,
roger.pau@citrix.com
Subject: [PATCH 1/7] Port WARN_ON_ONCE() from Linux
Date: Thu, 8 Feb 2018 20:10:49 -0700 [thread overview]
Message-ID: <20180209031055.21926-2-sameer.goel@linaro.org> (raw)
In-Reply-To: <20180209031055.21926-1-sameer.goel@linaro.org>
Port WARN_ON_ONCE macro from Linux.
Signed-off-by: Sameer Goel <sameer.goel@linaro.org>
Acked-by: Julien Grall <julien.grall@linaro.org>
---
xen/arch/arm/xen.lds.S | 1 +
xen/arch/x86/xen.lds.S | 1 +
xen/include/xen/lib.h | 13 +++++++++++++
3 files changed, 15 insertions(+)
diff --git a/xen/arch/arm/xen.lds.S b/xen/arch/arm/xen.lds.S
index b0390180b4..4dc7997cf0 100644
--- a/xen/arch/arm/xen.lds.S
+++ b/xen/arch/arm/xen.lds.S
@@ -87,6 +87,7 @@ SECTIONS
__end_schedulers_array = .;
*(.data.rel)
*(.data.rel.*)
+ *(.data.unlikely)
CONSTRUCTORS
} :text
diff --git a/xen/arch/x86/xen.lds.S b/xen/arch/x86/xen.lds.S
index 095298048f..353ca148ca 100644
--- a/xen/arch/x86/xen.lds.S
+++ b/xen/arch/x86/xen.lds.S
@@ -240,6 +240,7 @@ SECTIONS
*(.data)
*(.data.rel)
*(.data.rel.*)
+ *(.data.unlikely)
CONSTRUCTORS
} :text
diff --git a/xen/include/xen/lib.h b/xen/include/xen/lib.h
index 1d9771340c..697212a061 100644
--- a/xen/include/xen/lib.h
+++ b/xen/include/xen/lib.h
@@ -11,6 +11,19 @@
#define BUG_ON(p) do { if (unlikely(p)) BUG(); } while (0)
#define WARN_ON(p) do { if (unlikely(p)) WARN(); } while (0)
+#define WARN_ON_ONCE(p) \
+({ \
+ static bool __section(".data.unlikely") __warned; \
+ int __ret_warn_once = !!(p); \
+ \
+ if ( unlikely(__ret_warn_once && !__warned) ) \
+ { \
+ __warned = true; \
+ WARN(); \
+ } \
+ unlikely(__ret_warn_once); \
+})
+
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
/* Force a compilation error if condition is true */
#define BUILD_BUG_ON(cond) ({ _Static_assert(!(cond), "!(" #cond ")"); })
--
2.14.1
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next prev parent reply other threads:[~2018-02-09 3:11 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-09 3:10 [PATCH 0/7] SMMUv3 driver Sameer Goel
2018-02-09 3:10 ` Sameer Goel [this message]
2018-02-09 10:29 ` [PATCH 1/7] Port WARN_ON_ONCE() from Linux Roger Pau Monné
2018-02-09 10:45 ` Julien Grall
2018-02-09 10:47 ` Roger Pau Monné
2018-02-13 9:46 ` Jan Beulich
2018-05-18 22:46 ` Sameer Goel
2018-02-12 14:49 ` Wei Liu
2018-02-13 9:48 ` Jan Beulich
2018-02-09 3:10 ` [PATCH 2/7] xen/bitops: Rename LOG_2 to ilog2 Sameer Goel
2018-02-12 14:46 ` Wei Liu
2018-02-09 3:10 ` [PATCH 3/7] passthrough/arm: Modify SMMU driver to use generic device definition Sameer Goel
2018-02-09 3:10 ` [PATCH 4/7] Add verbatim copy of arm-smmu-v3.c from Linux Sameer Goel
2018-02-09 3:10 ` [PATCH 5/7] xen/iommu: smmu-v3: Add Xen specific code to enable the ported driver Sameer Goel
2018-03-01 14:07 ` Julien Grall
2018-03-01 14:21 ` Jan Beulich
2018-03-01 14:33 ` Julien Grall
2018-03-01 15:38 ` Jan Beulich
2018-03-10 17:53 ` Manish Jaggi
2018-03-12 3:36 ` Manish Jaggi
2018-04-19 10:54 ` Manish Jaggi
2018-05-09 8:30 ` Manish Jaggi
2018-05-09 8:58 ` Julien Grall
2018-05-11 20:54 ` Sameer Goel
2018-05-18 22:38 ` Sameer Goel
2018-02-09 3:10 ` [PATCH 6/7] drivers/passthrough/arm: Refactor code for arm smmu drivers Sameer Goel
2018-02-09 10:43 ` Roger Pau Monné
2018-02-09 10:51 ` Julien Grall
2018-02-09 11:02 ` Roger Pau Monné
2018-02-09 11:12 ` Julien Grall
2018-05-18 23:00 ` Sameer Goel
2018-02-09 17:54 ` Sameer Goel
2018-03-01 14:24 ` Julien Grall
2018-02-09 3:10 ` [PATCH 7/7] xen/smmu: Add a new config define for legacy SMMU Sameer Goel
2018-03-01 14:35 ` [PATCH 0/7] SMMUv3 driver Julien Grall
2018-03-04 14:52 ` Manish Jaggi
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