Commit d8aa712c authored by Russell King's avatar Russell King
Browse files

ARM: fix booting low-vectors machines 



Commit f6f91b0d (ARM: allow kuser helpers to be removed from the
vector page) required two pages for the vectors code.  Although the
code setting up the initial page tables was updated, the code which
allocates page tables for new processes wasn't, neither was the code
which tears down the mappings.  Fix this.

Fixes: f6f91b0d ("ARM: allow kuser helpers to be removed from the vector page")
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Cc: <stable@vger.kernel.org>
parent 11a5aa32

arch/arm/include/asm/pgtable.h

+1 −1
Original line number Diff line number Diff line
@@ -61,7 +61,7 @@ extern void __pgd_error(const char *file, int line, pgd_t); 
 * mapping to be mapped at.  This is particularly important for

 * non-high vector CPUs.

 */

#define FIRST_USER_ADDRESS	PAGE_SIZE

#define FIRST_USER_ADDRESS	(PAGE_SIZE * 2)



/*

 * Use TASK_SIZE as the ceiling argument for free_pgtables() and

arch/arm/mm/mmap.c

+1 −1
Original line number Diff line number Diff line
@@ -146,7 +146,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, 


	info.flags = VM_UNMAPPED_AREA_TOPDOWN;

	info.length = len;

	info.low_limit = PAGE_SIZE;

	info.low_limit = FIRST_USER_ADDRESS;

	info.high_limit = mm->mmap_base;

	info.align_mask = do_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;

	info.align_offset = pgoff << PAGE_SHIFT;

arch/arm/mm/pgd.c

+2 −1
Original line number Diff line number Diff line
@@ -87,7 +87,8 @@ pgd_t *pgd_alloc(struct mm_struct *mm) 
		init_pud = pud_offset(init_pgd, 0);

		init_pmd = pmd_offset(init_pud, 0);

		init_pte = pte_offset_map(init_pmd, 0);

		set_pte_ext(new_pte, *init_pte, 0);

		set_pte_ext(new_pte + 0, init_pte[0], 0);

		set_pte_ext(new_pte + 1, init_pte[1], 0);

		pte_unmap(init_pte);

		pte_unmap(new_pte);

	}

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