From: Andrew Yang <andrew.yang@mediatek.com> To: Minchan Kim <minchan@kernel.org>, Sergey Senozhatsky <senozhatsky@chromium.org>, Andrew Morton <akpm@linux-foundation.org>, Matthias Brugger <matthias.bgg@gmail.com>, AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>, Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: <wsd_upstream@mediatek.com>, <casper.li@mediatek.com>, Andrew Yang <andrew.yang@mediatek.com>, <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-mediatek@lists.infradead.org> Subject: [PATCH] zsmalloc: Fix races between modifications of fullness and isolated Date: Fri, 21 Jul 2023 14:37:01 +0800 [thread overview] Message-ID: <20230721063705.11455-1-andrew.yang@mediatek.com> (raw) Since fullness and isolated share the same unsigned int, modifications of them should be protected by the same lock. Signed-off-by: Andrew Yang <andrew.yang@mediatek.com> Fixes: c4549b871102 ("zsmalloc: remove zspage isolation for migration") --- mm/zsmalloc.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index 32f5bc4074df..b96230402a8d 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -1777,6 +1777,7 @@ static void replace_sub_page(struct size_class *class, struct zspage *zspage, static bool zs_page_isolate(struct page *page, isolate_mode_t mode) { + struct zs_pool *pool; struct zspage *zspage; /* @@ -1786,9 +1787,10 @@ static bool zs_page_isolate(struct page *page, isolate_mode_t mode) VM_BUG_ON_PAGE(PageIsolated(page), page); zspage = get_zspage(page); - migrate_write_lock(zspage); + pool = zspage->pool; + spin_lock(&pool->lock); inc_zspage_isolation(zspage); - migrate_write_unlock(zspage); + spin_unlock(&pool->lock); return true; } @@ -1858,8 +1860,8 @@ static int zs_page_migrate(struct page *newpage, struct page *page, * Since we complete the data copy and set up new zspage structure, * it's okay to release the pool's lock. */ - spin_unlock(&pool->lock); dec_zspage_isolation(zspage); + spin_unlock(&pool->lock); migrate_write_unlock(zspage); get_page(newpage); @@ -1876,14 +1878,16 @@ static int zs_page_migrate(struct page *newpage, struct page *page, static void zs_page_putback(struct page *page) { + struct zs_pool *pool; struct zspage *zspage; VM_BUG_ON_PAGE(!PageIsolated(page), page); zspage = get_zspage(page); - migrate_write_lock(zspage); + pool = zspage->pool; + spin_lock(&pool->lock); dec_zspage_isolation(zspage); - migrate_write_unlock(zspage); + spin_unlock(&pool->lock); } static const struct movable_operations zsmalloc_mops = { -- 2.18.0
WARNING: multiple messages have this Message-ID (diff)
From: Andrew Yang <andrew.yang@mediatek.com> To: Minchan Kim <minchan@kernel.org>, Sergey Senozhatsky <senozhatsky@chromium.org>, Andrew Morton <akpm@linux-foundation.org>, Matthias Brugger <matthias.bgg@gmail.com>, AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>, Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: <wsd_upstream@mediatek.com>, <casper.li@mediatek.com>, Andrew Yang <andrew.yang@mediatek.com>, <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-mediatek@lists.infradead.org> Subject: [PATCH] zsmalloc: Fix races between modifications of fullness and isolated Date: Fri, 21 Jul 2023 14:37:01 +0800 [thread overview] Message-ID: <20230721063705.11455-1-andrew.yang@mediatek.com> (raw) Since fullness and isolated share the same unsigned int, modifications of them should be protected by the same lock. Signed-off-by: Andrew Yang <andrew.yang@mediatek.com> Fixes: c4549b871102 ("zsmalloc: remove zspage isolation for migration") --- mm/zsmalloc.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index 32f5bc4074df..b96230402a8d 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -1777,6 +1777,7 @@ static void replace_sub_page(struct size_class *class, struct zspage *zspage, static bool zs_page_isolate(struct page *page, isolate_mode_t mode) { + struct zs_pool *pool; struct zspage *zspage; /* @@ -1786,9 +1787,10 @@ static bool zs_page_isolate(struct page *page, isolate_mode_t mode) VM_BUG_ON_PAGE(PageIsolated(page), page); zspage = get_zspage(page); - migrate_write_lock(zspage); + pool = zspage->pool; + spin_lock(&pool->lock); inc_zspage_isolation(zspage); - migrate_write_unlock(zspage); + spin_unlock(&pool->lock); return true; } @@ -1858,8 +1860,8 @@ static int zs_page_migrate(struct page *newpage, struct page *page, * Since we complete the data copy and set up new zspage structure, * it's okay to release the pool's lock. */ - spin_unlock(&pool->lock); dec_zspage_isolation(zspage); + spin_unlock(&pool->lock); migrate_write_unlock(zspage); get_page(newpage); @@ -1876,14 +1878,16 @@ static int zs_page_migrate(struct page *newpage, struct page *page, static void zs_page_putback(struct page *page) { + struct zs_pool *pool; struct zspage *zspage; VM_BUG_ON_PAGE(!PageIsolated(page), page); zspage = get_zspage(page); - migrate_write_lock(zspage); + pool = zspage->pool; + spin_lock(&pool->lock); dec_zspage_isolation(zspage); - migrate_write_unlock(zspage); + spin_unlock(&pool->lock); } static const struct movable_operations zsmalloc_mops = { -- 2.18.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2023-07-21 6:38 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-07-21 6:37 Andrew Yang [this message] 2023-07-21 6:37 ` [PATCH] zsmalloc: Fix races between modifications of fullness and isolated Andrew Yang 2023-07-26 2:31 ` Sergey Senozhatsky 2023-07-26 2:57 ` Sergey Senozhatsky 2023-07-26 3:18 ` Sergey Senozhatsky 2023-07-26 6:59 ` Andrew Yang (楊智強) 2023-07-26 11:31 ` Sergey Senozhatsky 2023-07-26 20:18 ` Andrew Morton
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20230721063705.11455-1-andrew.yang@mediatek.com \ --to=andrew.yang@mediatek.com \ --cc=akpm@linux-foundation.org \ --cc=angelogioacchino.delregno@collabora.com \ --cc=bigeasy@linutronix.de \ --cc=casper.li@mediatek.com \ --cc=linux-arm-kernel@lists.infradead.org \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-mediatek@lists.infradead.org \ --cc=linux-mm@kvack.org \ --cc=matthias.bgg@gmail.com \ --cc=minchan@kernel.org \ --cc=senozhatsky@chromium.org \ --cc=wsd_upstream@mediatek.com \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.