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List:       linux-backports
Subject:    [PATCH] backport: check Ubuntu kernel for u64_stats_update_begin_irqsave()
From:       Luca Coelho <luca () coelho ! fi>
Date:       2018-10-01 7:26:57
Message-ID: 20181001072657.17277-1-luca () coelho ! fi
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From: Luca Coelho <luciano.coelho@intel.com>

Ubuntu cherry-picked the patch that added
u64_stat_update_begin_irqsave() in their 4.15 kernel, so we get a
redefinition compilation error if we try to compile against that.

To solve this, check UTS_UBUNTU_RELEASE_ABI and don't define our
backported function if it's 33 or higher.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 backport/backport-include/linux/u64_stats_sync.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/backport/backport-include/linux/u64_stats_sync.h \
b/backport/backport-include/linux/u64_stats_sync.h index 0d2212382db7..251373a74139 \
                100644
--- a/backport/backport-include/linux/u64_stats_sync.h
+++ b/backport/backport-include/linux/u64_stats_sync.h
@@ -152,7 +152,8 @@ static inline bool u64_stats_fetch_retry_irq(const struct \
u64_stats_sync *syncp,  #endif /* LINUX_VERSION_IS_LESS(3,13,0) */
 
 #if LINUX_VERSION_IS_LESS(4,16,0) && \
-    !LINUX_VERSION_IN_RANGE(4,14,44, 4,15,0)
+    !LINUX_VERSION_IN_RANGE(4,14,44, 4,15,0) && \
+    !(LINUX_VERSION_IS_GEQ(4,15,18) && UTS_UBUNTU_RELEASE_ABI >= 33)
 static inline unsigned long
 u64_stats_update_begin_irqsave(struct u64_stats_sync *syncp)
 {
-- 
2.19.0

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