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d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=bfVQLroskM5Wc4DhZMIyj9jgHc+j8RHZ/garHr4Fpmo=; b=WBa+m3LuIyCL3gyUzPiNOZ3Y2UFlSoYUuzldbiyw22XxpZovuBwZEVY1+xX8ziFsny MCM8FzfioiWjcxhHZiG58p01uOJkPXVhDiuKnqUQFZUyufim1BW7Huigr+8det/m128D 5CX7qY23yyoR5VOfWc7Bwkax+aU7GKL4FgZu4v3khhdHj58Aph4fHFUShdRovweevxtz 0W1q2Cyn7wPU+i0NfYiHzMNDf68AYJYqZeMlMefdAgpmdfzK5gM2a0unAhVs1q8IBvOH B2SFNq7TvUAXuWsw4YyS7rjCo/bxyYksxo92PshstNagl8wwvB20kKx5fmS6sL6mg8qu 8WEA== X-Gm-Message-State: AOAM531b+5s+Uuice2P0SlsAVBltt7KI102o+m0yAM6Dpo26I6KbLKIZ lo0bb+wYpnATeVRNeBijqrP5bpIUDtY= X-Google-Smtp-Source: ABdhPJxZwwFPlarZ3LoosIXt55p8uBBCrvGv9J5VLrCxYXf9wPeT384wi+a1vkBEDJm/7ct0Z09BbNo6pl0= X-Received: by 2002:a25:a091:: with SMTP id y17mr28606051ybh.82.1597776434643; Tue, 18 Aug 2020 11:47:14 -0700 (PDT) Date: Tue, 18 Aug 2020 12:47:04 -0600 In-Reply-To: <20200818184704.3625199-1-yuzhao@google.com> Message-Id: <20200818184704.3625199-3-yuzhao@google.com> Mime-Version: 1.0 References: <20200818184704.3625199-1-yuzhao@google.com> X-Mailer: git-send-email 2.28.0.220.ged08abb693-goog Subject: [PATCH v2 3/3] mm: remove superfluous __ClearPageWaiters() From: Yu Zhao To: Andrew Morton Cc: Alexander Duyck , Huang Ying , David Hildenbrand , Michal Hocko , Yang Shi , Qian Cai , Mel Gorman , Nicholas Piggin , "=?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?=" , Hugh Dickins , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Joonsoo Kim , Yu Zhao Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: DB5871804E3A1 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Presumably __ClearPageWaiters() was added to follow the previously removed __ClearPageActive() pattern. Only flags that are in PAGE_FLAGS_CHECK_AT_FREE needs to be properly cleared because otherwise we think there may be some kind of leak. PG_waiters is not one of those flags and leaving the clearing to PAGE_FLAGS_CHECK_AT_PREP is more appropriate. Signed-off-by: Yu Zhao --- include/linux/page-flags.h | 2 +- mm/filemap.c | 2 ++ mm/memremap.c | 2 -- mm/swap.c | 3 --- 4 files changed, 3 insertions(+), 6 deletions(-) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 6be1aa559b1e..dba80a2bdfba 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -318,7 +318,7 @@ static inline int TestClearPage##uname(struct page *page) { return 0; } TESTSETFLAG_FALSE(uname) TESTCLEARFLAG_FALSE(uname) __PAGEFLAG(Locked, locked, PF_NO_TAIL) -PAGEFLAG(Waiters, waiters, PF_ONLY_HEAD) __CLEARPAGEFLAG(Waiters, waiters, PF_ONLY_HEAD) +PAGEFLAG(Waiters, waiters, PF_ONLY_HEAD) PAGEFLAG(Error, error, PF_NO_TAIL) TESTCLEARFLAG(Error, error, PF_NO_TAIL) PAGEFLAG(Referenced, referenced, PF_HEAD) TESTCLEARFLAG(Referenced, referenced, PF_HEAD) diff --git a/mm/filemap.c b/mm/filemap.c index 1aaea26556cc..75240c7ef73f 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1079,6 +1079,8 @@ static void wake_up_page_bit(struct page *page, int bit_nr) * other pages on it. * * That's okay, it's a rare case. The next waker will clear it. + * Otherwise the bit will be cleared by PAGE_FLAGS_CHECK_AT_PREP + * when the page is being freed. */ } spin_unlock_irqrestore(&q->lock, flags); diff --git a/mm/memremap.c b/mm/memremap.c index 3a06eb91cb59..a9d02ffaf9e3 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -451,8 +451,6 @@ void free_devmap_managed_page(struct page *page) return; } - __ClearPageWaiters(page); - mem_cgroup_uncharge(page); /* diff --git a/mm/swap.c b/mm/swap.c index 999a84dbe12c..40bf20a75278 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -90,7 +90,6 @@ static void __page_cache_release(struct page *page) del_page_from_lru_list(page, lruvec, page_off_lru(page)); spin_unlock_irqrestore(&pgdat->lru_lock, flags); } - __ClearPageWaiters(page); } static void __put_single_page(struct page *page) @@ -900,8 +899,6 @@ void release_pages(struct page **pages, int nr) del_page_from_lru_list(page, lruvec, page_off_lru(page)); } - __ClearPageWaiters(page); - list_add(&page->lru, &pages_to_free); } if (locked_pgdat) -- 2.28.0.220.ged08abb693-goog