The patch titled
slab allocators: Remove obsolete SLAB_MUST_HWCACHE_ALIGN
has been added to the -mm tree. Its filename is
slub-slab-allocators-remove-obsolete-slab_must_hwcache_align.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: slab allocators: Remove obsolete SLAB_MUST_HWCACHE_ALIGN
From: Christoph Lameter <clameter@xxxxxxx>
This patch was recently posted to lkml and acked by Pekka.
The flag SLAB_MUST_HWCACHE_ALIGN is
1. Never checked by SLAB at all.
2. A duplicate of SLAB_HWCACHE_ALIGN for SLUB
3. Fulfills the role of SLAB_HWCACHE_ALIGN for SLOB.
The only remaining use is in sparc64 and ppc64 and their use there
reflects some earlier role that the slab flag once may have had. If
its specified then SLAB_HWCACHE_ALIGN is also specified.
The flag is confusing, inconsistent and has no purpose.
Remove it.
Acked-by: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
Signed-off-by: Christoph Lameter <clameter@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slub.c | 5 ++---
1 files changed, 2 insertions(+), 3 deletions(-)
diff -puN mm/slub.c~slub-slab-allocators-remove-obsolete-slab_must_hwcache_align mm/slub.c
--- a/mm/slub.c~slub-slab-allocators-remove-obsolete-slab_must_hwcache_align
+++ a/mm/slub.c
@@ -1496,7 +1496,7 @@ static unsigned long calculate_alignment
* specified alignment though. If that is greater
* then use it.
*/
- if ((flags & (SLAB_MUST_HWCACHE_ALIGN | SLAB_HWCACHE_ALIGN)) &&
+ if ((flags & SLAB_HWCACHE_ALIGN) &&
size > L1_CACHE_BYTES / 2)
return max_t(unsigned long, align, L1_CACHE_BYTES);
@@ -3142,8 +3142,7 @@ SLAB_ATTR(reclaim_account);
static ssize_t hwcache_align_show(struct kmem_cache *s, char *buf)
{
- return sprintf(buf, "%d\n", !!(s->flags &
- (SLAB_HWCACHE_ALIGN|SLAB_MUST_HWCACHE_ALIGN)));
+ return sprintf(buf, "%d\n", !!(s->flags & SLAB_HWCACHE_ALIGN));
}
SLAB_ATTR_RO(hwcache_align);
_
Patches currently in -mm which might be from clameter@xxxxxxx are
origin.patch
slab-introduce-krealloc.patch
add-apply_to_page_range-which-applies-a-function-to-a-pte-range.patch
safer-nr_node_ids-and-nr_node_ids-determination-and-initial.patch
use-zvc-counters-to-establish-exact-size-of-dirtyable-pages.patch
slab-ensure-cache_alloc_refill-terminates.patch
smaps-extract-pmd-walker-from-smaps-code.patch
smaps-add-pages-referenced-count-to-smaps.patch
smaps-add-clear_refs-file-to-clear-reference.patch
slab-use-num_possible_cpus-in-enable_cpucache.patch
i386-use-page-allocator-to-allocate-thread_info-structure.patch
make-page-private-usable-in-compound-pages-v1.patch
optimize-compound_head-by-avoiding-a-shared-page.patch
add-virt_to_head_page-and-consolidate-code-in-slab-and-slub.patch
quicklists-for-page-table-pages.patch
quicklist-support-for-sparc64.patch
slab-allocators-remove-obsolete-slab_must_hwcache_align.patch
kmem_cache-simplify-slab-cache-creation.patch
slab-allocators-remove-multiple-alignment-specifications.patch
fault-injection-fix-failslab-with-config_numa.patch
mm-fix-handling-of-panic_on_oom-when-cpusets-are-in-use.patch
slab-allocators-remove-slab_debug_initial-flag.patch
slab-allocators-remove-slab_ctor_atomic.patch
slab-allocators-remove-useless-__gfp_no_grow-flag.patch
page-migration-only-migrate-pages-if-allocation-in-the-highest-zone-is-possible.patch
slub-core.patch
slub-change-default-alignments.patch
slub-allocate-smallest-object-size-if-the-user-asks-for-0-bytes.patch
powerpc-disable-slub-for-configurations-in-which-slab-page-structs-are-modified.patch
slub-make-page-private-usable-in-compound-pages-v1.patch
slub-add-virt_to_head_page-and-consolidate-code-in-slab-and-slub.patch
slub-fix-object-tracking.patch
slub-enable-tracking-of-full-slabs.patch
slub-validation-of-slabs-metadata-and-guard-zones.patch
slub-add-min_partial.patch
slub-add-ability-to-list-alloc--free-callers-per-slab.patch
slub-free-slabs-and-sort-partial-slab-lists-in-kmem_cache_shrink.patch
slub-remove-object-activities-out-of-checking-functions.patch
slub-user-documentation.patch
slub-add-slabinfo-tool.patch
slub-slab-allocators-remove-obsolete-slab_must_hwcache_align.patch
slub-slab-allocators-remove-slab_debug_initial-flag.patch
slub-slab-allocators-remove-slab_ctor_atomic.patch
slub-slab-allocators-remove-useless-__gfp_no_grow-flag.patch
quicklist-support-for-ia64.patch
quicklist-support-for-x86_64.patch
slub-exploit-page-mobility-to-increase-allocation-order.patch
slub-mm-only-make-slub-the-default-slab-allocator.patch
slub-i386-support.patch
remove-constructor-from-buffer_head.patch
slab-shutdown-cache_reaper-when-cpu-goes-down.patch
mm-implement-swap-prefetching.patch
revoke-core-code-slab-allocators-remove-slab_debug_initial-flag-revoke.patch
vmstat-use-our-own-timer-events.patch
make-vm-statistics-update-interval-configurable.patch
make-vm-statistics-update-interval-configurable-fix.patch
readahead-state-based-method-aging-accounting.patch
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