mm: provide a fallback for PAGE_KERNEL_EXEC for architectures (1a9b4b3d) · Commits · 戴 / test

Some architectures just don't have PAGE_KERNEL_EXEC. The mm/nommu.c and mm/vmalloc.c code have been using PAGE_KERNEL as a fallback for years. Move this fallback to asm-generic. Link: http://lkml.kernel.org/r/20180510185507.2439-3-mcgrof@kernel.org Signed-off-by:

Luis R. Rodriguez <mcgrof@kernel.org> Suggested-by:

Matthew Wilcox <willy@infradead.org> Reviewed-by:

Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

include/asm-generic/pgtable.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -1109,6 +1109,10 @@ static inline bool arch_has_pfn_modify_check(void)
		# define PAGE_KERNEL_RO PAGE_KERNEL
		#endif

		#ifndef PAGE_KERNEL_EXEC
		# define PAGE_KERNEL_EXEC PAGE_KERNEL
		#endif

		#endif /* !__ASSEMBLY__ */

		#ifndef io_remap_pfn_range

mm/nommu.c

+0 −4

Original line number	Diff line number	Diff line
		@@ -364,10 +364,6 @@ void *vzalloc_node(unsigned long size, int node)
		}
		EXPORT_SYMBOL(vzalloc_node);

		#ifndef PAGE_KERNEL_EXEC
		# define PAGE_KERNEL_EXEC PAGE_KERNEL
		#endif

		/**
		* vmalloc_exec - allocate virtually contiguous, executable memory
		* @size: allocation size

mm/vmalloc.c

+0 −4

Original line number	Diff line number	Diff line
		@@ -1907,10 +1907,6 @@ void *vzalloc_node(unsigned long size, int node)
		}
		EXPORT_SYMBOL(vzalloc_node);

		#ifndef PAGE_KERNEL_EXEC
		# define PAGE_KERNEL_EXEC PAGE_KERNEL
		#endif

		/**
		* vmalloc_exec - allocate virtually contiguous, executable memory
		* @size: allocation size

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