BMC/Intel-BMC/linux.git/arch/arm/mm/pgd.c, branch dev

mm: fix false-positive warning on exit due mm_nr_pmds(mm)

2015-02-12T01:06:04+00:00

The problem is that we check nr_ptes/nr_pmds in exit_mmap() which happens *before* pgd_free(). And if an arch does pte/pmd allocation in pgd_alloc() and frees them in pgd_free() we see offset in counters by the time of the checks. We tried to workaround this by offsetting expected counter value according to FIRST_USER_ADDRESS for both nr_pte and nr_pmd in exit_mmap(). But it doesn't work in some cases: 1. ARM with LPAE enabled also has non-zero USER_PGTABLES_CEILING, but upper addresses occupied with huge pmd entries, so the trick with offsetting expected counter value will get really ugly: we will have to apply it nr_pmds, but not nr_ptes. 2. Metag has non-zero FIRST_USER_ADDRESS, but doesn't do allocation pte/pmd page tables allocation in pgd_alloc(), just setup a pgd entry which is allocated at boot and shared accross all processes. The proposal is to move the check to check_mm() which happens *after* pgd_free() and do proper accounting during pgd_alloc() and pgd_free() which would bring counters to zero if nothing leaked. Signed-off-by: Kirill A. Shutemov Reported-by: Tyler Baker Tested-by: Tyler Baker Tested-by: Nishanth Menon Cc: Russell King Cc: James Hogan Cc: Guan Xuetao Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ARM: pgd allocation: retry on failure

2013-12-29T12:36:20+00:00

Make pgd allocation retry on failure; we really need this to succeed otherwise fork() can trigger OOMs. Signed-off-by: Russell King

ARM: fix booting low-vectors machines

2013-11-30T14:45:31+00:00

Commit f6f91b0d9fd9 (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: f6f91b0d9fd9 ("ARM: allow kuser helpers to be removed from the vector page") Signed-off-by: Russell King Cc:

ARM: move CP15 definitions to separate header file

2012-03-28T17:30:01+00:00

Avoid namespace conflicts with drivers over the CP15 definitions by moving CP15 related prototypes and definitions to a private header file. Acked-by: Stephen Warren Tested-by: Stephen Warren [Tegra] Acked-by: H Hartley Sweeten Tested-by: H Hartley Sweeten [EP93xx] Acked-by: Nicolas Pitre Acked-by: Kukjin Kim Signed-off-by: Russell King Signed-off-by: David Howells

ARM: LPAE: Page table maintenance for the 3-level format

2011-12-08T10:30:39+00:00

This patch modifies the pgd/pmd/pte manipulation functions to support the 3-level page table format. Since there is no need for an 'ext' argument to cpu_set_pte_ext(), this patch conditionally defines a different prototype for this function when CONFIG_ARM_LPAE. The patch also introduces the L_PGD_SWAPPER flag to mark pgd entries pointing to pmd tables pre-allocated in the swapper_pg_dir and avoid trying to free them at run-time. This flag is 0 with the classic page table format. Signed-off-by: Catalin Marinas

Merge branches 'fixes', 'pgt-next' and 'versatile' into devel

2011-03-20T09:32:12+00:00

ARM: pgtable: add pud-level code

2011-02-21T19:24:14+00:00

Add pud_offset() et.al. between the pgd and pmd code in preparation of using pgtable-nopud.h rather than 4level-fixup.h. This incorporates a fix from Jamie Iles for uaccess_with_memcpy.c. Signed-off-by: Russell King

thp: pte alloc trans splitting

2011-01-14T01:32:40+00:00

pte alloc routines must wait for split_huge_page if the pmd is not present and not null (i.e. pmd_trans_splitting). The additional branches are optimized away at compile time by pmd_trans_splitting if the config option is off. However we must pass the vma down in order to know the anon_vma lock to wait for. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Andrea Arcangeli Acked-by: Rik van Riel Acked-by: Mel Gorman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ARM: pgtable: remove FIRST_USER_PGD_NR

2010-12-22T11:05:34+00:00

FIRST_USER_PGD_NR is now unnecessary, as this has been replaced by FIRST_USER_ADDRESS except in the architecture code. Fix up the last usage of FIRST_USER_PGD_NR, and remove the definition. Signed-off-by: Russell King

ARM: pgtable: use pXd_none_or_clear_bad() in pgd_free()

2010-11-26T20:45:46+00:00

Remove knowledge of the 2-level wrapping in pgd_free(), and use the pXd_none_or_clear_bad() macros when checking the entries. Signed-off-by: Russell King