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mm/ksm: remove redundant code in ksm_fork

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Since commit 3c6f33b7273a ("mm/ksm: support fork/exec for prctl"), when a
child process is forked, the MMF_VM_MERGE_ANY flag will be inherited in
mm_init(). So, it's unnecessary to set the flag in ksm_fork().

Link: https://lkml.kernel.org/r/20240402024934.1093361-1-tujinjiang@huawei.com
Signed-off-by: Jinjiang Tu <tujinjiang@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Nanyong Sun <sunnanyong@huawei.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Stefan Roesch <shr@devkernel.io>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jinjiang Tu 2024-04-02 10:49:34 +08:00 committed by Andrew Morton
parent 0ae0b2b325
commit 7edea4c6fd
1 changed files with 2 additions and 10 deletions
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12
include/linux/ksm.h
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@ -45,16 +45,8 @@ static inline void ksm_might_unmap_zero_page(struct mm_struct *mm, pte_t pte)
static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm)
{
int ret;
if (test_bit(MMF_VM_MERGEABLE, &oldmm->flags)) {
ret = __ksm_enter(mm);
if (ret)
return ret;
}
if (test_bit(MMF_VM_MERGE_ANY, &oldmm->flags))
set_bit(MMF_VM_MERGE_ANY, &mm->flags);
if (test_bit(MMF_VM_MERGEABLE, &oldmm->flags))
return __ksm_enter(mm);
return 0;
}