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From: "Luis R. Rodriguez" <mcgrof@kernel.org>
To: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com,
	bp@alien8.de, linux@arm.linux.org.uk, mhiramat@kernel.org,
	masami.hiramatsu.pt@hitachi.com, jbaron@akamai.com,
	heiko.carstens@de.ibm.com, ananth@linux.vnet.ibm.com,
	anil.s.keshavamurthy@intel.com, davem@davemloft.net,
	realmz6@gmail.com
Cc: x86@kernel.org, luto@amacapital.net, keescook@chromium.org,
	torvalds@linux-foundation.org, gregkh@linuxfoundation.org,
	rusty@rustcorp.com.au, gnomes@lxorguk.ukuu.org.uk,
	alan@linux.intel.com, dwmw2@infradead.org, arnd@arndb.de,
	ming.lei@canonical.com, linux-arch@vger.kernel.org,
	benh@kernel.crashing.org, ananth@in.ibm.com, pebolle@tiscali.nl,
	fontana@sharpeleven.org, ciaran.farrell@suse.com,
	christopher.denicolo@suse.com, david.vrabel@citrix.com,
	konrad.wilk@oracle.com, mcb30@ipxe.org, jgross@suse.com,
	andrew.cooper3@citrix.com, andriy.shevchenko@linux.intel.com,
	paul.gortmaker@windriver.com, xen-devel@lists.xensource.com,
	ak@linux.intel.com, pali.rohar@gmail.com, dvhart@infradead.org,
	platform-driver-x86@vger.kernel.org, mmarek@suse.com,
	linux@rasmusvillemoes.dk, jkosina@suse.cz, korea.drzix@gmail.com,
	linux-kbuild@vger.kernel.org, tony.luck@intel.com,
	akpm@linux-foun
Subject: [RFC v3 01/13] x86: remove LTO_REFERENCE_INITCALL()
Date: Fri, 22 Jul 2016 21:24:35 +0000	[thread overview]
Message-ID: <1469222687-1600-2-git-send-email-mcgrof@kernel.org> (raw)
In-Reply-To: <1469222687-1600-1-git-send-email-mcgrof@kernel.org>

The setup for LTO never made it upstream, and although this has
some users, this is now really old stuff for a gcc 4.7 LTO problem.
We know that at least LTO_REFERENCE_INITCALL() work around can
be removed if LTO is not supported on v4.7 anymore.

As per Andi the DISABLE_LTO and LTO_CFLAGS are still neeeded though.

v3: added to this series, removing LTO_REFERENCE_INITCALL()
    justifies that other future similar macros do not need
    a respective LTO_REFERENCE_INITCALL() on them therefore
    simplifying new code.

Acked-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
---
 include/linux/init.h | 20 +-------------------
 1 file changed, 1 insertion(+), 19 deletions(-)

diff --git a/include/linux/init.h b/include/linux/init.h
index 1e5c131d5c9a..aa662ad80d9c 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -151,23 +151,6 @@ extern bool initcall_debug;
 
 #ifndef __ASSEMBLY__
 
-#ifdef CONFIG_LTO
-/* Work around a LTO gcc problem: when there is no reference to a variable
- * in a module it will be moved to the end of the program. This causes
- * reordering of initcalls which the kernel does not like.
- * Add a dummy reference function to avoid this. The function is
- * deleted by the linker.
- */
-#define LTO_REFERENCE_INITCALL(x) \
-	; /* yes this is needed */			\
-	static __used __exit void *reference_##x(void)	\
-	{						\
-		return &x;				\
-	}
-#else
-#define LTO_REFERENCE_INITCALL(x)
-#endif
-
 /* initcalls are now grouped by functionality into separate 
  * subsections. Ordering inside the subsections is determined
  * by link order. 
@@ -180,8 +163,7 @@ extern bool initcall_debug;
 
 #define __define_initcall(fn, id) \
 	static initcall_t __initcall_##fn##id __used \
-	__attribute__((__section__(".initcall" #id ".init"))) = fn; \
-	LTO_REFERENCE_INITCALL(__initcall_##fn##id)
+	__attribute__((__section__(".initcall" #id ".init"))) = fn;
 
 /*
  * Early initcalls run before initializing SMP.
-- 
2.8.4


WARNING: multiple messages have this Message-ID (diff)
From: "Luis R. Rodriguez" <mcgrof@kernel.org>
To: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com,
	bp@alien8.de, linux@arm.linux.org.uk, mhiramat@kernel.org,
	masami.hiramatsu.pt@hitachi.com, jbaron@akamai.com,
	heiko.carstens@de.ibm.com, ananth@linux.vnet.ibm.com,
	anil.s.keshavamurthy@intel.com, davem@davemloft.net,
	realmz6@gmail.com
Cc: x86@kernel.org, luto@amacapital.net, keescook@chromium.org,
	torvalds@linux-foundation.org, gregkh@linuxfoundation.org,
	rusty@rustcorp.com.au, gnomes@lxorguk.ukuu.org.uk,
	alan@linux.intel.com, dwmw2@infradead.org, arnd@arndb.de,
	ming.lei@canonical.com, linux-arch@vger.kernel.org,
	benh@kernel.crashing.org, ananth@in.ibm.com, pebolle@tiscali.nl,
	fontana@sharpeleven.org, ciaran.farrell@suse.com,
	christopher.denicolo@suse.com, david.vrabel@citrix.com,
	konrad.wilk@oracle.com, mcb30@ipxe.org, jgross@suse.com,
	andrew.cooper3@citrix.com, andriy.shevchenko@linux.intel.com,
	paul.gortmaker@windriver.com, xen-devel@lists.xensource.com,
	ak@linux.intel.com, pali.rohar@gmail.com, dvhart@infradead.org,
	platform-driver-x86@vger.kernel.org, mmarek@suse.com,
	linux@rasmusvillemoes.dk, jkosina@suse.cz, korea.drzix@gmail.com,
	linux-kbuild@vger.kernel.org, tony.luck@intel.com,
	akpm@linux-foun
Subject: [RFC v3 01/13] x86: remove LTO_REFERENCE_INITCALL()
Date: Fri, 22 Jul 2016 14:24:35 -0700	[thread overview]
Message-ID: <1469222687-1600-2-git-send-email-mcgrof@kernel.org> (raw)
In-Reply-To: <1469222687-1600-1-git-send-email-mcgrof@kernel.org>

The setup for LTO never made it upstream, and although this has
some users, this is now really old stuff for a gcc 4.7 LTO problem.
We know that at least LTO_REFERENCE_INITCALL() work around can
be removed if LTO is not supported on v4.7 anymore.

As per Andi the DISABLE_LTO and LTO_CFLAGS are still neeeded though.

v3: added to this series, removing LTO_REFERENCE_INITCALL()
    justifies that other future similar macros do not need
    a respective LTO_REFERENCE_INITCALL() on them therefore
    simplifying new code.

Acked-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
---
 include/linux/init.h | 20 +-------------------
 1 file changed, 1 insertion(+), 19 deletions(-)

diff --git a/include/linux/init.h b/include/linux/init.h
index 1e5c131d5c9a..aa662ad80d9c 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -151,23 +151,6 @@ extern bool initcall_debug;
 
 #ifndef __ASSEMBLY__
 
-#ifdef CONFIG_LTO
-/* Work around a LTO gcc problem: when there is no reference to a variable
- * in a module it will be moved to the end of the program. This causes
- * reordering of initcalls which the kernel does not like.
- * Add a dummy reference function to avoid this. The function is
- * deleted by the linker.
- */
-#define LTO_REFERENCE_INITCALL(x) \
-	; /* yes this is needed */			\
-	static __used __exit void *reference_##x(void)	\
-	{						\
-		return &x;				\
-	}
-#else
-#define LTO_REFERENCE_INITCALL(x)
-#endif
-
 /* initcalls are now grouped by functionality into separate 
  * subsections. Ordering inside the subsections is determined
  * by link order. 
@@ -180,8 +163,7 @@ extern bool initcall_debug;
 
 #define __define_initcall(fn, id) \
 	static initcall_t __initcall_##fn##id __used \
-	__attribute__((__section__(".initcall" #id ".init"))) = fn; \
-	LTO_REFERENCE_INITCALL(__initcall_##fn##id)
+	__attribute__((__section__(".initcall" #id ".init"))) = fn;
 
 /*
  * Early initcalls run before initializing SMP.
-- 
2.8.4

WARNING: multiple messages have this Message-ID (diff)
From: "Luis R. Rodriguez" <mcgrof@kernel.org>
To: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com,
	bp@alien8.de, linux@arm.linux.org.uk, mhiramat@kernel.org,
	masami.hiramatsu.pt@hitachi.com, jbaron@akamai.com,
	heiko.carstens@de.ibm.com, ananth@linux.vnet.ibm.com,
	anil.s.keshavamurthy@intel.com, davem@davemloft.net,
	realmz6@gmail.com
Cc: x86@kernel.org, luto@amacapital.net, keescook@chromium.org,
	torvalds@linux-foundation.org, gregkh@linuxfoundation.org,
	rusty@rustcorp.com.au, gnomes@lxorguk.ukuu.org.uk,
	alan@linux.intel.com, dwmw2@infradead.org, arnd@arndb.de,
	ming.lei@canonical.com, linux-arch@vger.kernel.org,
	benh@kernel.crashing.org, ananth@in.ibm.com, pebolle@tiscali.nl,
	fontana@sharpeleven.org, ciaran.farrell@suse.com,
	christopher.denicolo@suse.com, david.vrabel@citrix.com,
	konrad.wilk@oracle.com, mcb30@ipxe.org, jgross@suse.com,
	andrew.cooper3@citrix.com, andriy.shevchenko@linux.intel.com,
	paul.gortmaker@windriver.com, xen-devel@lists.xensource.com,
	ak@linux.intel.com, pali.rohar@gmail.com, dvhart@infradead.org,
	platform-driver-x86@vger.kernel.org, mmarek@suse.com,
	linux@rasmusvillemoes.dk, jkosina@suse.cz, korea.drzix@gmail.com,
	linux-kbuild@vger.kernel.org, tony.luck@intel.com,
	akpm@linux-foundation.org, linux-ia64@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-sh@vger.kernel.org,
	sparclinux@vger.kernel.org, catalin.marinas@arm.com,
	will.deacon@arm.com, rostedt@goodmis.org, jpoimboe@redhat.com,
	"Luis R. Rodriguez" <mcgrof@kernel.org>
Subject: [RFC v3 01/13] x86: remove LTO_REFERENCE_INITCALL()
Date: Fri, 22 Jul 2016 14:24:35 -0700	[thread overview]
Message-ID: <1469222687-1600-2-git-send-email-mcgrof@kernel.org> (raw)
In-Reply-To: <1469222687-1600-1-git-send-email-mcgrof@kernel.org>

The setup for LTO never made it upstream, and although this has
some users, this is now really old stuff for a gcc 4.7 LTO problem.
We know that at least LTO_REFERENCE_INITCALL() work around can
be removed if LTO is not supported on v4.7 anymore.

As per Andi the DISABLE_LTO and LTO_CFLAGS are still neeeded though.

v3: added to this series, removing LTO_REFERENCE_INITCALL()
    justifies that other future similar macros do not need
    a respective LTO_REFERENCE_INITCALL() on them therefore
    simplifying new code.

Acked-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
---
 include/linux/init.h | 20 +-------------------
 1 file changed, 1 insertion(+), 19 deletions(-)

diff --git a/include/linux/init.h b/include/linux/init.h
index 1e5c131d5c9a..aa662ad80d9c 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -151,23 +151,6 @@ extern bool initcall_debug;
 
 #ifndef __ASSEMBLY__
 
-#ifdef CONFIG_LTO
-/* Work around a LTO gcc problem: when there is no reference to a variable
- * in a module it will be moved to the end of the program. This causes
- * reordering of initcalls which the kernel does not like.
- * Add a dummy reference function to avoid this. The function is
- * deleted by the linker.
- */
-#define LTO_REFERENCE_INITCALL(x) \
-	; /* yes this is needed */			\
-	static __used __exit void *reference_##x(void)	\
-	{						\
-		return &x;				\
-	}
-#else
-#define LTO_REFERENCE_INITCALL(x)
-#endif
-
 /* initcalls are now grouped by functionality into separate 
  * subsections. Ordering inside the subsections is determined
  * by link order. 
@@ -180,8 +163,7 @@ extern bool initcall_debug;
 
 #define __define_initcall(fn, id) \
 	static initcall_t __initcall_##fn##id __used \
-	__attribute__((__section__(".initcall" #id ".init"))) = fn; \
-	LTO_REFERENCE_INITCALL(__initcall_##fn##id)
+	__attribute__((__section__(".initcall" #id ".init"))) = fn;
 
 /*
  * Early initcalls run before initializing SMP.
-- 
2.8.4


  reply	other threads:[~2016-07-22 21:24 UTC|newest]

Thread overview: 176+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-22 21:24 [RFC v3 00/13] linux: generalize sections, ranges and linker tables Luis R. Rodriguez
2016-07-22 21:24 ` Luis R. Rodriguez
2016-07-22 21:24 ` Luis R. Rodriguez
2016-07-22 21:24 ` Luis R. Rodriguez [this message]
2016-07-22 21:24   ` [RFC v3 01/13] x86: remove LTO_REFERENCE_INITCALL() Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24 ` [RFC v3 02/13] dell-smo8800: include uaccess.h Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:31   ` Pali Rohár
2016-07-22 21:31     ` Pali Rohár
2016-07-22 21:31     ` Pali Rohár
2016-07-22 21:24 ` [RFC v3 03/13] scripts/module-common.lds: enable generation Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24 ` [RFC v3 04/13] sections.h: guard against asm and linker script Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24 ` [RFC v3 05/13] sections.h: add sections header to collect all section info Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:37   ` James Hogan
2016-07-22 21:37     ` James Hogan
2016-07-22 21:37     ` James Hogan
2016-07-22 21:41     ` Luis R. Rodriguez
2016-07-22 21:41       ` Luis R. Rodriguez
2016-07-22 21:41       ` Luis R. Rodriguez
2016-07-29 17:28     ` Steven Rostedt
2016-07-29 17:28       ` Steven Rostedt
2016-07-29 17:28       ` Steven Rostedt
2016-07-22 21:24 ` [RFC v3 06/13] ranges.h: add helpers to build and identify Linux section ranges Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24 ` [RFC v3 07/13] tables.h: add linker table support Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-25 15:30   ` Masami Hiramatsu
2016-07-25 15:30     ` Masami Hiramatsu
2016-07-25 15:30     ` Masami Hiramatsu
2016-07-27 23:02     ` Luis R. Rodriguez
2016-07-27 23:02       ` Luis R. Rodriguez
2016-07-27 23:02       ` Luis R. Rodriguez
2016-07-28 17:08       ` H. Peter Anvin
2016-07-28 17:08       ` H. Peter Anvin
2016-07-28 17:08       ` H. Peter Anvin
2016-07-28 17:08         ` H. Peter Anvin
2016-07-28 17:08       ` H. Peter Anvin
2016-07-29 10:06   ` Borislav Petkov
2016-07-29 10:06     ` Borislav Petkov
2016-07-29 10:06     ` Borislav Petkov
2016-08-08 15:05     ` Luis R. Rodriguez
2016-08-08 15:05       ` Luis R. Rodriguez
2016-08-08 15:05       ` Luis R. Rodriguez
2016-08-09  3:55       ` Borislav Petkov
2016-08-09  3:55         ` Borislav Petkov
2016-08-09  3:55         ` Borislav Petkov
2016-08-12  3:51         ` Luis R. Rodriguez
2016-08-12  3:51           ` Luis R. Rodriguez
2016-08-12  3:51           ` Luis R. Rodriguez
2016-08-12  5:23           ` Borislav Petkov
2016-08-12  5:23             ` Borislav Petkov
2016-08-12  5:23             ` Borislav Petkov
2016-08-12  6:50             ` Luis R. Rodriguez
2016-08-12  6:50               ` Luis R. Rodriguez
2016-08-12  6:50               ` Luis R. Rodriguez
2016-08-12  7:25               ` Borislav Petkov
2016-08-12  7:25                 ` Borislav Petkov
2016-08-12  7:25                 ` Borislav Petkov
2016-08-12 15:28                 ` Luis R. Rodriguez
2016-08-12 15:28                   ` Luis R. Rodriguez
2016-08-12 15:28                   ` Luis R. Rodriguez
2016-08-12 15:51                   ` Borislav Petkov
2016-08-12 15:51                     ` Borislav Petkov
2016-08-12 15:51                     ` Borislav Petkov
2016-08-12 17:04                     ` Luis R. Rodriguez
2016-08-12 17:04                       ` Luis R. Rodriguez
2016-08-12 17:04                       ` Luis R. Rodriguez
2016-08-12 17:35                       ` Borislav Petkov
2016-08-12 17:35                         ` Borislav Petkov
2016-08-12 17:35                         ` Borislav Petkov
2016-08-12 18:16                         ` Kees Cook
2016-08-12 20:23                       ` Greg KH
2016-08-12 20:23                         ` Greg KH
2016-08-12 20:23                         ` Greg KH
2016-08-12 20:46                         ` Jiri Kosina
2016-08-12 20:46                           ` Jiri Kosina
2016-08-12 20:46                           ` Jiri Kosina
2016-08-12 22:00                         ` Luis R. Rodriguez
2016-08-12 22:00                           ` Luis R. Rodriguez
2016-08-12 22:00                           ` Luis R. Rodriguez
2016-08-13 10:46                           ` Greg KH
2016-08-13 10:46                             ` Greg KH
2016-08-13 10:46                             ` Greg KH
2016-08-13 17:54                             ` Luis R. Rodriguez
2016-08-13 17:54                               ` Luis R. Rodriguez
2016-08-13 17:54                               ` Luis R. Rodriguez
2016-07-22 21:24 ` [RFC v3 08/13] firmware/Makefile: force recompilation if makefile changes Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24 ` [RFC v3 09/13] firmware: port built-in section to linker table Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24 ` [RFC v3 10/13] jump_label: port __jump_table to linker tables Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:49   ` Josh Poimboeuf
2016-07-22 21:49     ` Josh Poimboeuf
2016-07-22 21:49     ` Josh Poimboeuf
2016-07-22 22:26     ` Luis R. Rodriguez
2016-07-22 22:26       ` Luis R. Rodriguez
2016-07-22 22:26       ` Luis R. Rodriguez
2016-07-22 22:55       ` Josh Poimboeuf
2016-07-22 22:55         ` Josh Poimboeuf
2016-07-22 22:55         ` Josh Poimboeuf
2016-07-27 22:55         ` Luis R. Rodriguez
2016-07-27 22:55           ` Luis R. Rodriguez
2016-07-27 22:55           ` Luis R. Rodriguez
2016-07-22 21:24 ` [RFC v3 11/13] dynamic_debug: port to use " Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24 ` [RFC v3 12/13] kprobes: port .kprobes.text to section range Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-25 15:19   ` Masami Hiramatsu
2016-07-25 15:19     ` Masami Hiramatsu
2016-07-25 15:19     ` Masami Hiramatsu
2016-07-27 22:40     ` Luis R. Rodriguez
2016-07-27 22:40       ` Luis R. Rodriguez
2016-07-27 22:40       ` Luis R. Rodriguez
2016-07-22 21:24 ` [RFC v3 13/13] kprobes: port blacklist kprobes to linker table Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-22 21:24   ` Luis R. Rodriguez
2016-07-25 15:27   ` Masami Hiramatsu
2016-07-25 15:27     ` Masami Hiramatsu
2016-07-25 15:27     ` Masami Hiramatsu
2016-07-27 23:00     ` Luis R. Rodriguez
2016-07-27 23:00       ` Luis R. Rodriguez
2016-07-27 23:00       ` Luis R. Rodriguez
2016-07-25 13:32 ` [RFC v3 00/13] linux: generalize sections, ranges and linker tables Masami Hiramatsu
2016-07-25 13:32   ` Masami Hiramatsu
2016-07-25 13:32   ` Masami Hiramatsu
2016-07-25 13:55   ` Richard Fontana
2016-07-25 13:55     ` Richard Fontana
2016-07-25 13:55     ` Richard Fontana
2016-07-27 22:46   ` Luis R. Rodriguez
2016-07-27 22:46     ` Luis R. Rodriguez
2016-07-27 22:46     ` Luis R. Rodriguez
2016-07-27 22:27 ` Luis R. Rodriguez
2016-08-09 14:24 ` One Thousand Gnomes
2016-08-09 14:24   ` One Thousand Gnomes
2016-08-09 14:24   ` One Thousand Gnomes
2016-08-09 16:09   ` James Bottomley
2016-08-09 16:09     ` James Bottomley
2016-08-09 16:09     ` James Bottomley
2016-08-10  4:51     ` Andy Lutomirski
2016-08-10  4:51       ` Andy Lutomirski
2016-08-15 20:15       ` Alan Cox
2016-08-15 20:15         ` Alan Cox
2016-08-15 21:00         ` Steven Rostedt
2016-08-15 21:00           ` Steven Rostedt
2016-08-15 21:00           ` Steven Rostedt
2016-08-15 22:40         ` James Bottomley
2016-08-15 22:40           ` James Bottomley
2016-08-15 22:40           ` James Bottomley
2016-08-15 22:44       ` James Bottomley
2016-08-15 22:44         ` James Bottomley
2016-08-15 22:44         ` James Bottomley
2016-08-10 17:03     ` Luis R. Rodriguez
2016-08-10 17:03       ` Luis R. Rodriguez
2016-08-10 17:03       ` Luis R. Rodriguez
2016-08-09 16:48   ` Richard Fontana
2016-08-09 16:48     ` Richard Fontana
2016-08-09 16:48     ` Richard Fontana
2016-08-09 16:52   ` Richard Fontana
2016-08-09 16:52     ` Richard Fontana
2016-08-09 16:52     ` Richard Fontana

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