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From: Sasha Levin <sashal@kernel.org>
To: stable@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Nathan Chancellor <natechancellor@gmail.com>,
	Dennis Zhou <dennis@kernel.org>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 4.18 29/39] arm64: percpu: Initialize ret in the default case
Date: Tue, 13 Nov 2018 00:50:43 -0500	[thread overview]
Message-ID: <20181113055053.78352-29-sashal@kernel.org> (raw)
In-Reply-To: <20181113055053.78352-1-sashal@kernel.org>

From: Nathan Chancellor <natechancellor@gmail.com>

[ Upstream commit b5bb425871186303e6936fa2581521bdd1964a58 ]

Clang warns that if the default case is taken, ret will be
uninitialized.

./arch/arm64/include/asm/percpu.h:196:2: warning: variable 'ret' is used
uninitialized whenever switch default is taken
[-Wsometimes-uninitialized]
        default:
        ^~~~~~~
./arch/arm64/include/asm/percpu.h:200:9: note: uninitialized use occurs
here
        return ret;
               ^~~
./arch/arm64/include/asm/percpu.h:157:19: note: initialize the variable
'ret' to silence this warning
        unsigned long ret, loop;
                         ^
                          = 0

This warning appears several times while building the erofs filesystem.
While it's not strictly wrong, the BUILD_BUG will prevent this from
becoming a true problem. Initialize ret to 0 in the default case right
before the BUILD_BUG to silence all of these warnings.

Reported-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/arm64/include/asm/percpu.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/include/asm/percpu.h b/arch/arm64/include/asm/percpu.h
index 9234013e759e..21a81b59a0cc 100644
--- a/arch/arm64/include/asm/percpu.h
+++ b/arch/arm64/include/asm/percpu.h
@@ -96,6 +96,7 @@ static inline unsigned long __percpu_##op(void *ptr,			\
 		: [val] "Ir" (val));					\
 		break;							\
 	default:							\
+		ret = 0;						\
 		BUILD_BUG();						\
 	}								\
 									\
@@ -125,6 +126,7 @@ static inline unsigned long __percpu_read(void *ptr, int size)
 		ret = READ_ONCE(*(u64 *)ptr);
 		break;
 	default:
+		ret = 0;
 		BUILD_BUG();
 	}
 
@@ -194,6 +196,7 @@ static inline unsigned long __percpu_xchg(void *ptr, unsigned long val,
 		: [val] "r" (val));
 		break;
 	default:
+		ret = 0;
 		BUILD_BUG();
 	}
 
-- 
2.17.1


  parent reply	other threads:[~2018-11-13  5:59 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-13  5:50 [PATCH AUTOSEL 4.18 01/39] bfs: add sanity check at bfs_fill_super() Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 02/39] cifs: don't dereference smb_file_target before null check Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 03/39] cifs: fix return value for cifs_listxattr Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 04/39] arm64: kprobe: make page to RO mode when allocate it Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 05/39] nvme-pci: fix conflicting p2p resource adds Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 06/39] block: brd: associate with queue until adding disk Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 07/39] net: hns3: bugfix for rtnl_lock's range in the hclgevf_reset() Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 08/39] net: hns3: bugfix for rtnl_lock's range in the hclge_reset() Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 09/39] net: hns3: bugfix for the initialization of command queue's spin lock Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 10/39] ixgbe: fix MAC anti-spoofing filter after VFLR Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 11/39] mm: Fix warning in insert_pfn() Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 12/39] mm/memory_hotplug: make add_memory() take the device_hotplug_lock Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 13/39] reiserfs: propagate errors from fill_with_dentries() properly Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 14/39] hfs: prevent btree data loss on root split Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 15/39] hfsplus: " Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 16/39] mm/gup_benchmark.c: prevent integer overflow in ioctl Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 17/39] perf unwind: Take pgoff into account when reporting elf to libdwfl Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 18/39] um: Give start_idle_thread() a return code Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 19/39] drm/edid: Add 6 bpc quirk for BOE panel Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 20/39] afs: Handle EIO from delivery function Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 21/39] platform/x86: intel_telemetry: report debugfs failure Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 22/39] clk: fixed-rate: fix of_node_get-put imbalance Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 23/39] perf symbols: Set PLT entry/header sizes properly on Sparc Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 24/39] fs/exofs: fix potential memory leak in mount option parsing Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 25/39] clk: samsung: exynos5420: Enable PERIS clocks for suspend Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 26/39] apparmor: Fix uninitialized value in aa_split_fqname Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 27/39] x86/earlyprintk: Add a force option for pciserial device Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 28/39] platform/x86: acerhdf: Add BIOS entry for Gateway LT31 v1.3307 Sasha Levin
2018-11-13  5:50 ` Sasha Levin [this message]
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 30/39] clk: meson: clk-pll: drop CLK_GET_RATE_NOCACHE where unnecessary Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 31/39] clk: sunxi-ng: sun50i: h6: Add 2x fixed post-divider to MMC module clocks Sasha Levin
2018-11-13 12:27   ` Icenowy Zheng
2018-11-22 19:35     ` Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 32/39] clk: ti: fix OF child-node lookup Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 33/39] mm: thp: fix MADV_DONTNEED vs migrate_misplaced_transhuge_page race condition Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 34/39] mm: thp: fix mmu_notifier in migrate_misplaced_transhuge_page() Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 35/39] mm: calculate deferred pages after skipping mirrored memory Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 36/39] mm/vmstat.c: assert that vmstat_text is in sync with stat_items_size Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 37/39] userfaultfd: allow get_mempolicy(MPOL_F_NODE|MPOL_F_ADDR) to trigger userfaults Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 38/39] mm: don't miss the last page because of round-off error Sasha Levin
2018-11-13  5:50 ` [PATCH AUTOSEL 4.18 39/39] mm: don't warn about large allocations for slab Sasha Levin

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