Unverified Commit 5fde3db5 authored by Zong Li's avatar Zong Li Committed by Palmer Dabbelt
Browse files

riscv: add ARCH_SUPPORTS_DEBUG_PAGEALLOC support 



ARCH_SUPPORTS_DEBUG_PAGEALLOC provides a hook to map and unmap
pages for debugging purposes. Implement the __kernel_map_pages
functions to fill the poison pattern.

Signed-off-by: default avatarZong Li <zong.li@sifive.com>
Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
parent 395a21ff

arch/riscv/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -131,6 +131,9 @@ config ARCH_SELECT_MEMORY_MODEL 
config ARCH_WANT_GENERAL_HUGETLB

	def_bool y



config ARCH_SUPPORTS_DEBUG_PAGEALLOC

	def_bool y



config SYS_SUPPORTS_HUGETLBFS

	def_bool y

arch/riscv/mm/pageattr.c

+13 −0
Original line number Diff line number Diff line
@@ -172,3 +172,16 @@ int set_direct_map_default_noflush(struct page *page) 


	return walk_page_range(&init_mm, start, end, &pageattr_ops, &masks);

}



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

{

	if (!debug_pagealloc_enabled())

		return;



	if (enable)

		__set_memory((unsigned long)page_address(page), numpages,

			     __pgprot(_PAGE_PRESENT), __pgprot(0));

	else

		__set_memory((unsigned long)page_address(page), numpages,

			     __pgprot(0), __pgprot(_PAGE_PRESENT));

}

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