The patch titled
/dev/mem: make size_inside_page() logic straight
has been added to the -mm tree. Its filename is
dev-mem-make-size_inside_page-logic-straight.patch
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------------------------------------------------------
Subject: /dev/mem: make size_inside_page() logic straight
From: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Also convert more size_inside_page() users.
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Avi Kivity <avi@xxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxx>
Cc: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Cc: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/char/mem.c | 34 ++++++++++++----------------------
1 file changed, 12 insertions(+), 22 deletions(-)
diff -puN drivers/char/mem.c~dev-mem-make-size_inside_page-logic-straight drivers/char/mem.c
--- a/drivers/char/mem.c~dev-mem-make-size_inside_page-logic-straight
+++ a/drivers/char/mem.c
@@ -40,12 +40,9 @@ static inline unsigned long size_inside_
{
unsigned long sz;
- if (-start & (PAGE_SIZE - 1))
- sz = -start & (PAGE_SIZE - 1);
- else
- sz = PAGE_SIZE;
+ sz = PAGE_SIZE - (start & (PAGE_SIZE - 1));
- return min_t(unsigned long, sz, size);
+ return min(sz, size);
}
/*
@@ -140,9 +137,7 @@ static ssize_t read_mem(struct file * fi
#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
/* we don't have page 0 mapped on sparc and m68k.. */
if (p < PAGE_SIZE) {
- sz = PAGE_SIZE - p;
- if (sz > count)
- sz = count;
+ sz = size_inside_page(p, count);
if (sz > 0) {
if (clear_user(buf, sz))
return -EFAULT;
@@ -203,9 +198,7 @@ static ssize_t write_mem(struct file * f
#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
/* we don't have page 0 mapped on sparc and m68k.. */
if (p < PAGE_SIZE) {
- unsigned long sz = PAGE_SIZE - p;
- if (sz > count)
- sz = count;
+ sz = size_inside_page(p, count);
/* Hmm. Do something? */
buf += sz;
p += sz;
@@ -414,15 +407,14 @@ static ssize_t read_kmem(struct file *fi
#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
/* we don't have page 0 mapped on sparc and m68k.. */
if (p < PAGE_SIZE && low_count > 0) {
- size_t tmp = PAGE_SIZE - p;
- if (tmp > low_count) tmp = low_count;
- if (clear_user(buf, tmp))
+ sz = size_inside_page(p, low_count);
+ if (clear_user(buf, sz))
return -EFAULT;
- buf += tmp;
- p += tmp;
- read += tmp;
- low_count -= tmp;
- count -= tmp;
+ buf += sz;
+ p += sz;
+ read += sz;
+ low_count -= sz;
+ count -= sz;
}
#endif
while (low_count > 0) {
@@ -482,9 +474,7 @@ do_write_kmem(void *p, unsigned long rea
#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
/* we don't have page 0 mapped on sparc and m68k.. */
if (realp < PAGE_SIZE) {
- unsigned long sz = PAGE_SIZE - realp;
- if (sz > count)
- sz = count;
+ sz = size_inside_page(realp, count);
/* Hmm. Do something? */
buf += sz;
p += sz;
_
Patches currently in -mm which might be from fengguang.wu@xxxxxxxxx are
linux-next.patch
mm-memory-failure-remove-config_unevictable_lru-config-option.patch
libfs-return-error-code-on-failed-attr-set.patch
readahead-add-blk_run_backing_dev.patch
readahead-add-blk_run_backing_dev-fix.patch
readahead-add-blk_run_backing_dev-fix-fix-2.patch
mm-clean-up-page_remove_rmap.patch
mm-oom-analysis-add-per-zone-statistics-to-show_free_areas.patch
mm-oom-analysis-add-buffer-cache-information-to-show_free_areas.patch
mm-oom-analysis-add-shmem-vmstat.patch
mm-shrink_inactive_list-nr_scan-accounting-fix-fix.patch
mm-vmstat-add-isolate-pages.patch
mm-vmstat-add-isolate-pages-fix.patch
vmscan-throttle-direct-reclaim-when-too-many-pages-are-isolated-already.patch
mm-remove-__addsub_zone_page_state.patch
mm-count-only-reclaimable-lru-pages-v2.patch
vmscan-move-clearpageactive-from-move_active_pages-to-shrink_active_list.patch
vmscan-kill-unnecessary-page-flag-test.patch
vmscan-kill-unnecessary-prefetch.patch
ksm-add-mmu_notifier-set_pte_at_notify.patch
ksm-first-tidy-up-madvise_vma.patch
ksm-define-madv_mergeable-and-madv_unmergeable.patch
ksm-the-mm-interface-to-ksm.patch
ksm-no-debug-in-page_dup_rmap.patch
ksm-identify-pageksm-pages.patch
ksm-kernel-samepage-merging.patch
ksm-prevent-mremap-move-poisoning.patch
ksm-change-copyright-message.patch
ksm-change-ksm-nice-level-to-be-5.patch
mm-do-batched-scans-for-mem_cgroup.patch
mm-vsmcan-check-shrink_active_list-sc-isolate_pages-return-value.patch
dev-mem-remove-redundant-test-on-len.patch
dev-mem-introduce-size_inside_page.patch
dev-mem-cleanup-unxlate_dev_mem_ptr-calls.patch
dev-mem-cleanup-unxlate_dev_mem_ptr-calls-fix.patch
dev-mem-make-size_inside_page-logic-straight.patch
dev-mem-remove-the-written-variable-in-write_kmem.patch
dev-mem-remove-redundant-parameter-from-do_write_kmem.patch
documentation-vm-gitignore-add-page-types.patch
page-types-add-feature-for-walking-process-address-space.patch
page-types-add-feature-for-walking-process-address-space-checkpatch-fixes.patch
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