linux-kernel - [PATCH v11 01/13] compiler.h, kasan: add __SANITIZE_ADDRESS__ check for __no_kasan_or

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Date:   Fri,  8 Jun 2018 19:09:36 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     x86@...nel.org, platform-driver-x86@...r.kernel.org
Cc:     dave.hansen@...el.com, sean.j.christopherson@...el.com,
        nhorman@...hat.com, npmccallum@...hat.com,
        Christopher Li <sparse@...isli.org>,
        linux-sparse@...r.kernel.org (open list:SPARSE CHECKER),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v11 01/13] compiler.h, kasan: add __SANITIZE_ADDRESS__ check for __no_kasan_or_inline

From: Sean Christopherson <sean.j.christopherson@...el.com>

Add 'defined(__SANITIZE_ADDRESS__)' to check to determine whether
__no_kasan_or_inline should be 'no_kasan' or 'inline'.  Files that
compile with KASAN disabled may not link to KASAN, in which case
the __maybe_unused attribute added in the 'no_kasan' option can
cause linker errors due to unused functions that manually invoke
KASAN functions, e.g. read_word_at_a_time(), not being discarded.

Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 include/linux/compiler.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index ab4711c63601..e7a863a3ac8c 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -188,7 +188,7 @@ void __read_once_size(const volatile void *p, void *res, int size)
 	__READ_ONCE_SIZE;
 }
 
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN) && defined(__SANITIZE_ADDRESS__)
 /*
  * We can't declare function 'inline' because __no_sanitize_address confilcts
  * with inlining. Attempt to inline it may cause a build failure.
-- 
2.17.0