linux-toradex.git/arch/powerpc/mm/slice.c, branch v5.0

powerpc/mm: fix always true/false warning in slice.c

2018-10-20T02:26:47+00:00

This patch fixes the following warnings (obtained with make W=1).

arch/powerpc/mm/slice.c: In function 'slice_range_to_mask':
arch/powerpc/mm/slice.c:73:12: error: comparison is always true due to limited range of data type [-Werror=type-limits]
  if (start < SLICE_LOW_TOP) {
            ^
arch/powerpc/mm/slice.c:81:20: error: comparison is always false due to limited range of data type [-Werror=type-limits]
  if ((start + len) > SLICE_LOW_TOP) {
                    ^
arch/powerpc/mm/slice.c: In function 'slice_mask_for_free':
arch/powerpc/mm/slice.c:136:17: error: comparison is always true due to limited range of data type [-Werror=type-limits]
  if (high_limit <= SLICE_LOW_TOP)
                 ^
arch/powerpc/mm/slice.c: In function 'slice_check_range_fits':
arch/powerpc/mm/slice.c:185:12: error: comparison is always true due to limited range of data type [-Werror=type-limits]
  if (start < SLICE_LOW_TOP) {
            ^
arch/powerpc/mm/slice.c:195:39: error: comparison is always false due to limited range of data type [-Werror=type-limits]
  if (SLICE_NUM_HIGH && ((start + len) > SLICE_LOW_TOP)) {
                                       ^
arch/powerpc/mm/slice.c: In function 'slice_scan_available':
arch/powerpc/mm/slice.c:306:11: error: comparison is always true due to limited range of data type [-Werror=type-limits]
  if (addr < SLICE_LOW_TOP) {
           ^
arch/powerpc/mm/slice.c: In function 'get_slice_psize':
arch/powerpc/mm/slice.c:709:11: error: comparison is always true due to limited range of data type [-Werror=type-limits]
  if (addr < SLICE_LOW_TOP) {
           ^

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman

powerpc/mm: fix missing prototypes in slice.c

2018-10-20T02:26:47+00:00

This patch fixes the following warnings (obtained with make W=1).

arch/powerpc/mm/slice.c: At top level:
arch/powerpc/mm/slice.c:682:15: error: no previous prototype for 'arch_get_unmapped_area' [-Werror=missing-prototypes]
 unsigned long arch_get_unmapped_area(struct file *filp,
               ^
arch/powerpc/mm/slice.c:692:15: error: no previous prototype for 'arch_get_unmapped_area_topdown' [-Werror=missing-prototypes]
 unsigned long arch_get_unmapped_area_topdown(struct file *filp,
               ^

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman

powerpc/64s/hash: Simplify slb_flush_and_rebolt()

2018-10-14T07:04:09+00:00

slb_flush_and_rebolt() is misleading, it is called in virtual mode, so
it can not possibly change the stack, so it should not be touching the
shadow area. And since vmalloc is no longer bolted, it should not
change any bolted mappings at all.

Change the name to slb_flush_and_restore_bolted(), and have it just
load the kernel stack from what's currently in the shadow SLB area.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman

powerpc/64s/hash: Provide arch_setup_exec() hooks for hash slice setup

2018-10-14T07:04:09+00:00

This will be used by the SLB code in the next patch, but for now this
sets the slb_addr_limit to the correct size for 32-bit tasks.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman

Revert "convert SLB miss handlers to C" and subsequent commits

2018-10-03T05:32:49+00:00

This reverts commits:
  5e46e29e6a97 ("powerpc/64s/hash: convert SLB miss handlers to C")
  8fed04d0f6ae ("powerpc/64s/hash: remove user SLB data from the paca")
  655deecf67b2 ("powerpc/64s/hash: SLB allocation status bitmaps")
  2e1626744e8d ("powerpc/64s/hash: provide arch_setup_exec hooks for hash slice setup")
  89ca4e126a3f ("powerpc/64s/hash: Add a SLB preload cache")

This series had a few bugs, and the fixes are not all trivial. So
revert most of it for now.

Signed-off-by: Michael Ellerman

powerpc/64s/hash: provide arch_setup_exec hooks for hash slice setup

2018-09-19T12:01:56+00:00

This will be used by the SLB code in the next patch, but for now this
sets the slb_addr_limit to the correct size for 32-bit tasks.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman

powerpc/64s/hash: remove user SLB data from the paca

2018-09-19T12:01:46+00:00

User SLB mappig data is copied into the PACA from the mm->context so
it can be accessed by the SLB miss handlers.

After the C conversion, SLB miss handlers now run with relocation on,
and user SLB misses are able to take recursive kernel SLB misses, so
the user SLB mapping data can be removed from the paca and accessed
directly.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman

powerpc/8xx: Fix build with hugetlbfs enabled

2018-04-11T02:00:23+00:00

8xx uses the slice code when hugetlbfs is enabled. We missed a header
include on 8xx which resulted in the below build failure:

  config: mpc885_ads_defconfig + CONFIG_HUGETLBFS

  arch/powerpc/mm/slice.c: In function 'slice_get_unmapped_area':
  arch/powerpc/mm/slice.c:655:2: error: implicit declaration of function 'need_extra_context'
  arch/powerpc/mm/slice.c:656:3: error: implicit declaration of function 'alloc_extended_context'

on PPC64 the mmu_context.h was included via linux/pkeys.h

Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Michael Ellerman

powerpc/mm: Add support for handling > 512TB address in SLB miss

2018-03-30T13:10:38+00:00

For addresses above 512TB we allocate additional mmu contexts. To make
it all easy, addresses above 512TB are handled with IR/DR=1 and with
stack frame setup.

The mmu_context_t is also updated to track the new extended_ids. To
support upto 4PB we need a total 8 contexts.

Signed-off-by: Aneesh Kumar K.V 
[mpe: Minor formatting tweaks and comment wording, switch BUG to WARN
      in get_ea_context().]
Signed-off-by: Michael Ellerman

powerpc/mm/slice: Consolidate return path in slice_get_unmapped_area()

2018-03-30T13:10:37+00:00

In a following patch, on finding a free area we will need to do
allocatinon of extra contexts as needed. Consolidating the return path
for slice_get_unmapped_area() will make that easier.

Split into a separate patch to make review easy.

Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Michael Ellerman