linux-kernel - [RFC v2 1/8] page_flags: add is_folio

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230526075552.363524-2-mcgrof@kernel.org>
Date:   Fri, 26 May 2023 00:55:45 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     hughd@...gle.com, akpm@...ux-foundation.org, willy@...radead.org,
        brauner@...nel.org, djwong@...nel.org
Cc:     p.raghav@...sung.com, da.gomez@...sung.com, rohan.puri@...sung.com,
        rpuri.linux@...il.com, a.manzanares@...sung.com, dave@...olabs.net,
        yosryahmed@...gle.com, keescook@...omium.org, hare@...e.de,
        kbusch@...nel.org, mcgrof@...nel.org, patches@...ts.linux.dev,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [RFC v2 1/8] page_flags: add is_folio_hwpoison()

Provide a helper similar to is_page_hwpoison() for folios
which tests the first head and if the folio is large any page in
the folio is tested for the poison flag.

Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 include/linux/page-flags.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 1c68d67b832f..4d5f395edf03 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -883,6 +883,13 @@ static inline bool is_page_hwpoison(struct page *page)
 	return PageHuge(page) && PageHWPoison(compound_head(page));
 }
 
+static inline bool is_folio_hwpoison(struct folio *folio)
+{
+       if (folio_test_hwpoison(folio))
+               return true;
+       return folio_test_large(folio) && folio_test_has_hwpoisoned(folio);
+}
+
 /*
  * For pages that are never mapped to userspace (and aren't PageSlab),
  * page_type may be used.  Because it is initialised to -1, we invert the
-- 
2.39.2