The patch titled /dev/mem: remove redundant test on len has been added to the -mm tree. Its filename is dev-mem-remove-redundant-test-on-len.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: /dev/mem: remove redundant test on len From: Wu Fengguang <fengguang.wu@xxxxxxxxx> The len test in write_kmem() is always true, so can be reduced. Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx> Acked-by: Andi Kleen <ak@xxxxxxxxxxxxxxx> Cc: Marcelo Tosatti <mtosatti@xxxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxx> Cc: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx> Cc: Johannes Berg <johannes@xxxxxxxxxxxxxxxx> Cc: Avi Kivity <avi@xxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/char/mem.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff -puN drivers/char/mem.c~dev-mem-remove-redundant-test-on-len drivers/char/mem.c --- a/drivers/char/mem.c~dev-mem-remove-redundant-test-on-len +++ a/drivers/char/mem.c @@ -582,14 +582,12 @@ static ssize_t write_kmem(struct file * if (len > PAGE_SIZE) len = PAGE_SIZE; - if (len) { - written = copy_from_user(kbuf, buf, len); - if (written) { - if (wrote + virtr) - break; - free_page((unsigned long)kbuf); - return -EFAULT; - } + written = copy_from_user(kbuf, buf, len); + if (written) { + if (wrote + virtr) + break; + free_page((unsigned long)kbuf); + return -EFAULT; } len = vwrite(kbuf, (char *)p, len); count -= len; _ 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 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 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 -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html