From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, stable@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>, "H. Peter Anvin" <hpa@zytor.com>, Joe Perches <joe@perches.com>, Nick Desaulniers <ndesaulniers@google.com>, Juergen Gross <jgross@suse.com>, Linus Torvalds <torvalds@linux-foundation.org>, Peter Zijlstra <peterz@infradead.org>, Thomas Gleixner <tglx@linutronix.de>, acme@redhat.com, akataria@vmware.com, akpm@linux-foundation.org, andrea.parri@amarulasolutions.com, ard.biesheuvel@linaro.org, aryabinin@virtuozzo.com, astrachan@google.com, boris.ostrovsky@oracle.com, brijesh.singh@amd.com, caoj.fnst@cn.fujitsu.com, geert@linux-m68k.org, ghackmann@google.com, jan.kiszka@siemens.com, jarkko.sakkinen@linux.intel.com, jpoimboe@redhat.com, keescook@google.com, kirill.shutemov@linux.intel.com, kstewart@linuxfoundation.org, linux-efi@vger.kernel.org, linux-kbuild@vger.kernel.org, manojgupta@google.com, mawilcox@microsoft.com, michal.lkml@markovi.net, mjg59@google.com, mka@chromium.org, pombredanne@nexb.com, rientjes@google.com, rostedt@goodmis.org, sedat.dilek@gmail.com, thomas.lendacky@amd.com, tstellar@redhat.com, tweek@google.com, virtualization@lists.linux-foundation.org, will.deacon@arm.com, yamada.masahiro@socionext.com, Ingo Molnar <mingo@kernel.org> Subject: [PATCH 4.9 05/66] compiler-gcc.h: Add __attribute__((gnu_inline)) to all inline declarations Date: Fri, 20 Jul 2018 14:13:22 +0200 [thread overview] Message-ID: <20180720121407.556231581@linuxfoundation.org> (raw) In-Reply-To: <20180720121407.228772286@linuxfoundation.org> 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nick Desaulniers <ndesaulniers@google.com> commit d03db2bc26f0e4a6849ad649a09c9c73fccdc656 upstream. Functions marked extern inline do not emit an externally visible function when the gnu89 C standard is used. Some KBUILD Makefiles overwrite KBUILD_CFLAGS. This is an issue for GCC 5.1+ users as without an explicit C standard specified, the default is gnu11. Since c99, the semantics of extern inline have changed such that an externally visible function is always emitted. This can lead to multiple definition errors of extern inline functions at link time of compilation units whose build files have removed an explicit C standard compiler flag for users of GCC 5.1+ or Clang. Suggested-by: Arnd Bergmann <arnd@arndb.de> Suggested-by: H. Peter Anvin <hpa@zytor.com> Suggested-by: Joe Perches <joe@perches.com> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Acked-by: Juergen Gross <jgross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: acme@redhat.com Cc: akataria@vmware.com Cc: akpm@linux-foundation.org Cc: andrea.parri@amarulasolutions.com Cc: ard.biesheuvel@linaro.org Cc: aryabinin@virtuozzo.com Cc: astrachan@google.com Cc: boris.ostrovsky@oracle.com Cc: brijesh.singh@amd.com Cc: caoj.fnst@cn.fujitsu.com Cc: geert@linux-m68k.org Cc: ghackmann@google.com Cc: gregkh@linuxfoundation.org Cc: jan.kiszka@siemens.com Cc: jarkko.sakkinen@linux.intel.com Cc: jpoimboe@redhat.com Cc: keescook@google.com Cc: kirill.shutemov@linux.intel.com Cc: kstewart@linuxfoundation.org Cc: linux-efi@vger.kernel.org Cc: linux-kbuild@vger.kernel.org Cc: manojgupta@google.com Cc: mawilcox@microsoft.com Cc: michal.lkml@markovi.net Cc: mjg59@google.com Cc: mka@chromium.org Cc: pombredanne@nexb.com Cc: rientjes@google.com Cc: rostedt@goodmis.org Cc: sedat.dilek@gmail.com Cc: thomas.lendacky@amd.com Cc: tstellar@redhat.com Cc: tweek@google.com Cc: virtualization@lists.linux-foundation.org Cc: will.deacon@arm.com Cc: yamada.masahiro@socionext.com Link: http://lkml.kernel.org/r/20180621162324.36656-2-ndesaulniers@google.com Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- include/linux/compiler-gcc.h | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -65,25 +65,40 @@ #endif /* + * Feature detection for gnu_inline (gnu89 extern inline semantics). Either + * __GNUC_STDC_INLINE__ is defined (not using gnu89 extern inline semantics, + * and we opt in to the gnu89 semantics), or __GNUC_STDC_INLINE__ is not + * defined so the gnu89 semantics are the default. + */ +#ifdef __GNUC_STDC_INLINE__ +# define __gnu_inline __attribute__((gnu_inline)) +#else +# define __gnu_inline +#endif + +/* * Force always-inline if the user requests it so via the .config, * or if gcc is too old. * GCC does not warn about unused static inline functions for * -Wunused-function. This turns out to avoid the need for complex #ifdef * directives. Suppress the warning in clang as well by using "unused" * function attribute, which is redundant but not harmful for gcc. + * Prefer gnu_inline, so that extern inline functions do not emit an + * externally visible function. This makes extern inline behave as per gnu89 + * semantics rather than c99. This prevents multiple symbol definition errors + * of extern inline functions at link time. + * A lot of inline functions can cause havoc with function tracing. */ #if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \ !defined(CONFIG_OPTIMIZE_INLINING) || (__GNUC__ < 4) -#define inline inline __attribute__((always_inline,unused)) notrace -#define __inline__ __inline__ __attribute__((always_inline,unused)) notrace -#define __inline __inline __attribute__((always_inline,unused)) notrace +#define inline \ + inline __attribute__((always_inline, unused)) notrace __gnu_inline #else -/* A lot of inline functions can cause havoc with function tracing */ -#define inline inline __attribute__((unused)) notrace -#define __inline__ __inline__ __attribute__((unused)) notrace -#define __inline __inline __attribute__((unused)) notrace +#define inline inline __attribute__((unused)) notrace __gnu_inline #endif +#define __inline__ inline +#define __inline inline #define __always_inline inline __attribute__((always_inline)) #define noinline __attribute__((noinline))
WARNING: multiple messages have this Message-ID (diff)
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, stable@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>, "H. Peter Anvin" <hpa@zytor.com>, Joe Perches <joe@perches.com>, Nick Desaulniers <ndesaulniers@google.com>, Juergen Gross <jgross@suse.com>, Linus Torvalds <torvalds@linux-foundation.org>, Peter Zijlstra <peterz@infradead.org>, Thomas Gleixner <tglx@linutronix.de>, acme@redhat.com, akataria@vmware.com, akpm@linux-foundation.org, andrea.parri@amarulasolutions.com, ard.biesheuvel@linaro.org, aryabinin@virtuozzo.com, astrachan@google.com, boris.ostrovsky@oracle.com, brijesh.singh@amd.com, caoj.fnst@cn.fujitsu.com, geert@linux-m68k.org, ghackmann@google.com, jan.kiszka@siemens.com, jarkko.sakkinen@linux.intel.com, jpoimboe@redhat.com, keescook@google.com, kirill.shut Subject: [PATCH 4.9 05/66] compiler-gcc.h: Add __attribute__((gnu_inline)) to all inline declarations Date: Fri, 20 Jul 2018 14:13:22 +0200 [thread overview] Message-ID: <20180720121407.556231581@linuxfoundation.org> (raw) In-Reply-To: <20180720121407.228772286@linuxfoundation.org> 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nick Desaulniers <ndesaulniers@google.com> commit d03db2bc26f0e4a6849ad649a09c9c73fccdc656 upstream. Functions marked extern inline do not emit an externally visible function when the gnu89 C standard is used. Some KBUILD Makefiles overwrite KBUILD_CFLAGS. This is an issue for GCC 5.1+ users as without an explicit C standard specified, the default is gnu11. Since c99, the semantics of extern inline have changed such that an externally visible function is always emitted. This can lead to multiple definition errors of extern inline functions at link time of compilation units whose build files have removed an explicit C standard compiler flag for users of GCC 5.1+ or Clang. Suggested-by: Arnd Bergmann <arnd@arndb.de> Suggested-by: H. Peter Anvin <hpa@zytor.com> Suggested-by: Joe Perches <joe@perches.com> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Acked-by: Juergen Gross <jgross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: acme@redhat.com Cc: akataria@vmware.com Cc: akpm@linux-foundation.org Cc: andrea.parri@amarulasolutions.com Cc: ard.biesheuvel@linaro.org Cc: aryabinin@virtuozzo.com Cc: astrachan@google.com Cc: boris.ostrovsky@oracle.com Cc: brijesh.singh@amd.com Cc: caoj.fnst@cn.fujitsu.com Cc: geert@linux-m68k.org Cc: ghackmann@google.com Cc: gregkh@linuxfoundation.org Cc: jan.kiszka@siemens.com Cc: jarkko.sakkinen@linux.intel.com Cc: jpoimboe@redhat.com Cc: keescook@google.com Cc: kirill.shutemov@linux.intel.com Cc: kstewart@linuxfoundation.org Cc: linux-efi@vger.kernel.org Cc: linux-kbuild@vger.kernel.org Cc: manojgupta@google.com Cc: mawilcox@microsoft.com Cc: michal.lkml@markovi.net Cc: mjg59@google.com Cc: mka@chromium.org Cc: pombredanne@nexb.com Cc: rientjes@google.com Cc: rostedt@goodmis.org Cc: sedat.dilek@gmail.com Cc: thomas.lendacky@amd.com Cc: tstellar@redhat.com Cc: tweek@google.com Cc: virtualization@lists.linux-foundation.org Cc: will.deacon@arm.com Cc: yamada.masahiro@socionext.com Link: http://lkml.kernel.org/r/20180621162324.36656-2-ndesaulniers@google.com Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- include/linux/compiler-gcc.h | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -65,25 +65,40 @@ #endif /* + * Feature detection for gnu_inline (gnu89 extern inline semantics). Either + * __GNUC_STDC_INLINE__ is defined (not using gnu89 extern inline semantics, + * and we opt in to the gnu89 semantics), or __GNUC_STDC_INLINE__ is not + * defined so the gnu89 semantics are the default. + */ +#ifdef __GNUC_STDC_INLINE__ +# define __gnu_inline __attribute__((gnu_inline)) +#else +# define __gnu_inline +#endif + +/* * Force always-inline if the user requests it so via the .config, * or if gcc is too old. * GCC does not warn about unused static inline functions for * -Wunused-function. This turns out to avoid the need for complex #ifdef * directives. Suppress the warning in clang as well by using "unused" * function attribute, which is redundant but not harmful for gcc. + * Prefer gnu_inline, so that extern inline functions do not emit an + * externally visible function. This makes extern inline behave as per gnu89 + * semantics rather than c99. This prevents multiple symbol definition errors + * of extern inline functions at link time. + * A lot of inline functions can cause havoc with function tracing. */ #if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \ !defined(CONFIG_OPTIMIZE_INLINING) || (__GNUC__ < 4) -#define inline inline __attribute__((always_inline,unused)) notrace -#define __inline__ __inline__ __attribute__((always_inline,unused)) notrace -#define __inline __inline __attribute__((always_inline,unused)) notrace +#define inline \ + inline __attribute__((always_inline, unused)) notrace __gnu_inline #else -/* A lot of inline functions can cause havoc with function tracing */ -#define inline inline __attribute__((unused)) notrace -#define __inline__ __inline__ __attribute__((unused)) notrace -#define __inline __inline __attribute__((unused)) notrace +#define inline inline __attribute__((unused)) notrace __gnu_inline #endif +#define __inline__ inline +#define __inline inline #define __always_inline inline __attribute__((always_inline)) #define noinline __attribute__((noinline))
next prev parent reply other threads:[~2018-07-20 12:30 UTC|newest] Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-07-20 12:13 [PATCH 4.9 00/66] 4.9.114-stable review Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 01/66] MIPS: Use async IPIs for arch_trigger_cpumask_backtrace() Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 02/66] compiler, clang: suppress warning for unused static inline functions Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 03/66] compiler, clang: properly override inline for clang Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 04/66] compiler, clang: always inline when CONFIG_OPTIMIZE_INLINING is disabled Greg Kroah-Hartman 2018-07-20 12:13 ` Greg Kroah-Hartman [this message] 2018-07-20 12:13 ` [PATCH 4.9 05/66] compiler-gcc.h: Add __attribute__((gnu_inline)) to all inline declarations Greg Kroah-Hartman 2018-07-20 12:13 ` Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 06/66] x86/asm: Add _ASM_ARG* constants for argument registers to <asm/asm.h> Greg Kroah-Hartman 2018-07-20 12:13 ` Greg Kroah-Hartman 2018-07-20 12:13 ` Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 07/66] x86/paravirt: Make native_save_fl() extern inline Greg Kroah-Hartman 2018-07-20 12:13 ` Greg Kroah-Hartman 2018-07-20 12:13 ` Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 08/66] ocfs2: subsystem.su_mutex is required while accessing the item->ci_parent Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 09/66] ocfs2: ip_alloc_sem should be taken in ocfs2_get_block() Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 10/66] mtd: m25p80: consider max message size in m25p80_read Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 11/66] spi/bcm63xx: make spi subsystem aware of message size limits Greg Kroah-Hartman 2018-07-20 12:34 ` Mark Brown 2018-07-20 13:39 ` Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 13/66] bcm63xx_enet: correct clock usage Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 14/66] bcm63xx_enet: do not write to random DMA channel on BCM6345 Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 15/66] crypto: crypto4xx - remove bad list_del Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 16/66] crypto: crypto4xx - fix crypto4xx_build_pdr, crypto4xx_build_sdr leak Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 17/66] atm: zatm: Fix potential Spectre v1 Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 18/66] ipvlan: fix IFLA_MTU ignored on NEWLINK Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 19/66] net: dccp: avoid crash in ccid3_hc_rx_send_feedback() Greg Kroah-Hartman 2018-07-20 12:13 ` Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 20/66] net: dccp: switch rx_tstamp_last_feedback to monotonic clock Greg Kroah-Hartman 2018-07-20 12:13 ` Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 21/66] net/mlx5: Fix incorrect raw command length parsing Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 22/66] net/mlx5: Fix wrong size allocation for QoS ETC TC regitster Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 23/66] net_sched: blackhole: tell upper qdisc about dropped packets Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 24/66] net: sungem: fix rx checksum support Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 25/66] qed: Fix use of incorrect size in memcpy call Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 26/66] qed: Limit msix vectors in kdump kernel to the minimum required count Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 28/66] r8152: napi hangup fix after disconnect Greg Kroah-Hartman 2018-07-20 12:13 ` [4.9,28/66] " Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 29/66] tcp: fix Fast Open key endianness Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 31/66] vhost_net: validate sock before trying to put its fd Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 32/66] net/packet: fix use-after-free Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 33/66] net/mlx5: Fix command interface race in polling mode Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 34/66] net: cxgb3_main: fix potential Spectre v1 Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 35/66] rtlwifi: rtl8821ae: fix firmware is not ready to run Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 36/66] net: lan78xx: Fix race in tx pending skb size calculation Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 37/66] netfilter: ebtables: reject non-bridge targets Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 38/66] reiserfs: fix buffer overflow with long warning messages Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 39/66] KEYS: DNS: fix parsing multiple options Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 40/66] netfilter: ipv6: nf_defrag: drop skb dst before queueing Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 41/66] rds: avoid unenecessary cong_update in loop transport Greg Kroah-Hartman 2018-07-20 12:13 ` [PATCH 4.9 42/66] net/nfc: Avoid stalls when nfc_alloc_send_skb() returned NULL Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 43/66] arm64: assembler: introduce ldr_this_cpu Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 44/66] KVM: arm64: Store vcpu on the stack during __guest_enter() Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 45/66] KVM: arm/arm64: Convert kvm_host_cpu_state to a static per-cpu allocation Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 46/66] KVM: arm64: Change hyp_panic()s dependency on tpidr_el2 Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 47/66] arm64: alternatives: use tpidr_el2 on VHE hosts Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 48/66] KVM: arm64: Stop save/restoring host tpidr_el1 on VHE Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 49/66] arm64: alternatives: Add dynamic patching feature Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 50/66] KVM: arm/arm64: Do not use kern_hyp_va() with kvm_vgic_global_state Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 51/66] KVM: arm64: Avoid storing the vcpu pointer on the stack Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 52/66] arm/arm64: smccc: Add SMCCC-specific return codes Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 53/66] arm64: Call ARCH_WORKAROUND_2 on transitions between EL0 and EL1 Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 54/66] arm64: Add per-cpu infrastructure to call ARCH_WORKAROUND_2 Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 55/66] arm64: Add ARCH_WORKAROUND_2 probing Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 56/66] arm64: Add ssbd command-line option Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 57/66] arm64: ssbd: Add global mitigation state accessor Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 58/66] arm64: ssbd: Skip apply_ssbd if not using dynamic mitigation Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 59/66] arm64: ssbd: Restore mitigation status on CPU resume Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 60/66] arm64: ssbd: Introduce thread flag to control userspace mitigation Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 61/66] arm64: ssbd: Add prctl interface for per-thread mitigation Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 62/66] arm64: KVM: Add HYP per-cpu accessors Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 63/66] arm64: KVM: Add ARCH_WORKAROUND_2 support for guests Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 64/66] arm64: KVM: Handle guests ARCH_WORKAROUND_2 requests Greg Kroah-Hartman 2018-07-20 12:14 ` [PATCH 4.9 65/66] arm64: KVM: Add ARCH_WORKAROUND_2 discovery through ARCH_FEATURES_FUNC_ID Greg Kroah-Hartman 2018-07-20 13:34 ` [PATCH 4.9 00/66] 4.9.114-stable review Nathan Chancellor 2018-07-20 13:40 ` Greg Kroah-Hartman 2018-07-21 7:36 ` Naresh Kamboju 2018-07-21 13:40 ` Guenter Roeck
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