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Commit af96e443 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

x86: CPA no alias checking for _NX 



NX settings are not required to be consistent across alias mappings.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 31eedd82

arch/x86/mm/pageattr.c

+5 −2
Original line number Diff line number Diff line
@@ -669,7 +669,7 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages, 
				    pgprot_t mask_set, pgprot_t mask_clr)

{

	struct cpa_data cpa;

	int ret, cache;

	int ret, cache, checkalias;



	/*

	 * Check, if we are requested to change a not supported
@@ -695,7 +695,10 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages, 
	cpa.mask_clr = mask_clr;

	cpa.flushtlb = 0;



	ret = __change_page_attr_set_clr(&cpa, 1);

	/* No alias checking for _NX bit modifications */

	checkalias = (pgprot_val(mask_set) | pgprot_val(mask_clr)) != _PAGE_NX;



	ret = __change_page_attr_set_clr(&cpa, checkalias);



	/*

	 * Check whether we really changed something: