linux-kernel - [PATCH v4 03/12] mm: Reserve asm-generic prot flag 0x10 for arch use

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Message-Id: <20191211154206.46260-4-broonie@kernel.org>
Date:   Wed, 11 Dec 2019 15:41:57 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     Paul Elliott <paul.elliott@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Amit Kachhap <amit.kachhap@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Marc Zyngier <maz@...nel.org>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Szabolcs Nagy <szabolcs.nagy@....com>,
        "H.J. Lu" <hjl.tools@...il.com>, Andrew Jones <drjones@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>, Jann Horn <jannh@...gle.com>,
        Richard Henderson <richard.henderson@...aro.org>,
        Kristina Martšenko <kristina.martsenko@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Florian Weimer <fweimer@...hat.com>,
        Sudakshina Das <sudi.das@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, Dave Martin <Dave.Martin@....com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH v4 03/12] mm: Reserve asm-generic prot flag 0x10 for arch use

From: Dave Martin <Dave.Martin@....com>

The asm-generic mman definitions are used by a few architectures
that also define an arch-specific PROT flag with value 0x10.  This
currently applies to sparc and powerpc, and arm64 will soon join
in.

To help future maintainers, document the use of this flag in the
asm-generic header too.

Signed-off-by: Dave Martin <Dave.Martin@....com>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 include/uapi/asm-generic/mman-common.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h
index c160a5354eb6..81442d2aaecb 100644
--- a/include/uapi/asm-generic/mman-common.h
+++ b/include/uapi/asm-generic/mman-common.h
@@ -11,6 +11,7 @@
 #define PROT_WRITE	0x2		/* page can be written */
 #define PROT_EXEC	0x4		/* page can be executed */
 #define PROT_SEM	0x8		/* page may be used for atomic ops */
+ /*			0x10		   reserved for arch-specific use */
 #define PROT_NONE	0x0		/* page can not be accessed */
 #define PROT_GROWSDOWN	0x01000000	/* mprotect flag: extend change to start of growsdown vma */
 #define PROT_GROWSUP	0x02000000	/* mprotect flag: extend change to end of growsup vma */
-- 
2.20.1