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Commit a84f2423 authored by Chris Metcalf's avatar Chris Metcalf
Browse files

tile: map data region shadow of kernel as R/W 



This is necessary for things like reading /proc/kcore, doing ftrace,
etc.  It happens by default when using huge pages to map the kernel
data, but not when using small pages.

Signed-off-by: default avatarChris Metcalf <cmetcalf@ezchip.com>
parent 49e4e156

arch/tile/mm/init.c

+5 −2
Original line number Diff line number Diff line
@@ -233,9 +233,12 @@ static pgprot_t __init init_pgprot(ulong address) 
	if (kdata_huge)

		return construct_pgprot(PAGE_KERNEL, PAGE_HOME_HASH);



	/* We map the aliased pages of permanent text inaccessible. */

	/*

	 * We map the aliased pages of permanent text so we can

	 * update them if necessary, for ftrace, etc.

	 */

	if (address < (ulong) _sinittext - CODE_DELTA)

		return PAGE_NONE;

		return construct_pgprot(PAGE_KERNEL, PAGE_HOME_HASH);



	/* We map read-only data non-coherent for performance. */

	if ((address >= (ulong) __start_rodata &&