linux-kernel - [PATCH v2] tile: handle __ro_after

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Message-Id: <1479155369-18074-1-git-send-email-cmetcalf@mellanox.com>
Date:   Mon, 14 Nov 2016 15:29:29 -0500
From:   Chris Metcalf <cmetcalf@...lanox.com>
To:     Heiko Carstens <heiko.carstens@...ibm.com>,
        Kees Cook <keescook@...omium.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        linux-kernel@...r.kernel.org
Cc:     Chris Metcalf <cmetcalf@...lanox.com>
Subject: [PATCH v2] tile: handle __ro_after_init like parisc does

The tile architecture already marks RO_DATA as read-only in
the kernel, so grouping RO_AFTER_INIT_DATA with RO_DATA, as is
done by default, means the kernel faults in init when it tries
to write to RO_AFTER_INIT_DATA.  For now, just arrange that
__ro_after_init is handled like __write_once, i.e. __read_mostly.

Signed-off-by: Chris Metcalf <cmetcalf@...lanox.com>
---
 arch/tile/include/asm/cache.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/tile/include/asm/cache.h b/arch/tile/include/asm/cache.h
index 6160761d5f61..4810e48dbbbf 100644
--- a/arch/tile/include/asm/cache.h
+++ b/arch/tile/include/asm/cache.h
@@ -61,4 +61,7 @@
  */
 #define __write_once __read_mostly
 
+/* __ro_after_init is the generic name for the tile arch __write_once. */
+#define __ro_after_init __read_mostly
+
 #endif /* _ASM_TILE_CACHE_H */
-- 
2.7.2