arch: don't memset(0) memory returned by memblock_alloc()

memblock_alloc() already clears the allocated memory, no point in doing
it twice.

Link: http://lkml.kernel.org/r/1548057848-15136-14-git-send-email-rppt@linux.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>	[m68k]
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Christoph Hellwig <hch@lst.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Guo Ren <guoren@kernel.org>
Cc: Guo Ren <ren_guo@c-sky.com>				[c-sky]
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Juergen Gross <jgross@suse.com>			[Xen]
Cc: Mark Salter <msalter@redhat.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Paul Burton <paul.burton@mips.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/c6x/mm/init.c

@@ -40,7 +40,6 @@ void __init paging_init(void)
 
 	empty_zero_page      = (unsigned long) memblock_alloc(PAGE_SIZE,
 							      PAGE_SIZE);
-	memset((void *)empty_zero_page, 0, PAGE_SIZE);
 
 	/*
 	 * Set up user data space

arch/h8300/mm/init.c

@@ -68,7 +68,6 @@ void __init paging_init(void)
 	 * to a couple of allocated pages.
 	 */
 	empty_zero_page = (unsigned long)memblock_alloc(PAGE_SIZE, PAGE_SIZE);
-	memset((void *)empty_zero_page, 0, PAGE_SIZE);
 
 	/*
 	 * Set up SFC/DFC registers (user data space).

arch/ia64/kernel/mca.c

@@ -400,8 +400,6 @@ ia64_log_init(int sal_info_type)
 
 	// set up OS data structures to hold error info
 	IA64_LOG_ALLOCATE(sal_info_type, max_size);
-	memset(IA64_LOG_CURR_BUFFER(sal_info_type), 0, max_size);
-	memset(IA64_LOG_NEXT_BUFFER(sal_info_type), 0, max_size);
 }
 
 /*

arch/m68k/mm/mcfmmu.c

@@ -44,7 +44,6 @@ void __init paging_init(void)
 	int i;
 
 	empty_zero_page = (void *) memblock_alloc(PAGE_SIZE, PAGE_SIZE);
-	memset((void *) empty_zero_page, 0, PAGE_SIZE);
 
 	pg_dir = swapper_pg_dir;
 	memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));

arch/microblaze/mm/init.c

@@ -376,10 +376,8 @@ void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
 
 	if (mem_init_done)
 		p = kzalloc(size, mask);
-	else {
+	else
 		p = memblock_alloc(size, SMP_CACHE_BYTES);
-		if (p)
-			memset(p, 0, size);
-	}
+
 	return p;
 }

arch/sparc/kernel/prom_32.c

@@ -33,8 +33,6 @@ void * __init prom_early_alloc(unsigned long size)
 	void *ret;
 
 	ret = memblock_alloc(size, SMP_CACHE_BYTES);
-	if (ret != NULL)
-		memset(ret, 0, size);
 
 	prom_early_allocated += size;