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Commit ad4d15b5 authored by qctecmdr Service's avatar qctecmdr Service Committed by Gerrit - the friendly Code Review server
Browse files

Merge "arm: provision page alloc debug support"

parents 023ae4e9 06c43d9e

arch/arm/Kconfig.debug

+4 −0
Original line number Diff line number Diff line
@@ -63,6 +63,10 @@ config DEBUG_USER 
	      8 - SIGSEGV faults

	     16 - SIGBUS faults



config ARCH_SUPPORTS_DEBUG_PAGEALLOC

	def_bool y

	depends on FORCE_PAGES



config FORCE_PAGES

	bool "Force lowmem to be mapped with 4K pages"

        help

arch/arm/mm/pageattr.c

+17 −1
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2014, The Linux Foundation. All rights reserved.

 * Copyright (c) 2014,2017-2018 The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -98,3 +98,19 @@ int set_memory_x(unsigned long addr, int numpages) 
					__pgprot(0),

					__pgprot(L_PTE_XN));

}



#ifdef CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC

void __kernel_map_pages(struct page *page, int numpages, int enable)

{

	unsigned long addr;



	if (PageHighMem(page))

		return;



	addr = (unsigned long) page_address(page);

	if (enable)

		set_memory_rw(addr, numpages);

	else

		set_memory_ro(addr, numpages);

}

#endif