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From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
To: Arnd Bergmann <arnd@arndb.de>,
	Khalid Aziz <khalid.aziz@oracle.com>,
	Andrey Konovalov <andreyknvl@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Christian Brauner <christian.brauner@ubuntu.com>,
	Kees Cook <keescook@chromium.org>, Ingo Molnar <mingo@kernel.org>,
	Aleksa Sarai <cyphar@cyphar.com>,
	Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-arch@vger.kernel.org,
	Vineet Gupta <Vineet.Gupta1@synopsys.com>,
	linux-snps-arc@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [RFC 1/4] asm-generic/uaccess: don't define inline functions if noinline lib/* in use
Date: Tue, 14 Jan 2020 12:08:43 -0800
Message-ID: <20200114200846.29434-2-vgupta@synopsys.com> (raw)
In-Reply-To: <20200114200846.29434-1-vgupta@synopsys.com>

There are 2 generic varaints of strncpy_from_user() / strnlen_user()
 (1). inline version in asm-generic/uaccess.h
 (2). optimized word-at-a-time version in lib/*

This patch disables #1 if #2 selected. This allows arches to continue
reusing asm-generic/uaccess.h for rest of code

This came up when switching ARC to generic word-at-a-time interface

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
 include/asm-generic/uaccess.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h
index e935318804f8..74c14211377b 100644
--- a/include/asm-generic/uaccess.h
+++ b/include/asm-generic/uaccess.h
@@ -227,6 +227,7 @@ __strncpy_from_user(char *dst, const char __user *src, long count)
 }
 #endif
 
+#ifndef CONFIG_GENERIC_STRNCPY_FROM_USER
 static inline long
 strncpy_from_user(char *dst, const char __user *src, long count)
 {
@@ -234,6 +235,7 @@ strncpy_from_user(char *dst, const char __user *src, long count)
 		return -EFAULT;
 	return __strncpy_from_user(dst, src, count);
 }
+#endif
 
 /*
  * Return the size of a string (including the ending 0)
@@ -244,6 +246,7 @@ strncpy_from_user(char *dst, const char __user *src, long count)
 #define __strnlen_user(s, n) (strnlen((s), (n)) + 1)
 #endif
 
+#ifndef CONFIG_GENERIC_STRNLEN_USER
 /*
  * Unlike strnlen, strnlen_user includes the nul terminator in
  * its returned count. Callers should check for a returned value
@@ -255,6 +258,7 @@ static inline long strnlen_user(const char __user *src, long n)
 		return 0;
 	return __strnlen_user(src, n);
 }
+#endif
 
 /*
  * Zero Userspace
-- 
2.20.1


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Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-14 20:08 [RFC 0/4] Switching ARC to optimized generic strncpy_from_user Vineet Gupta
2020-01-14 20:08 ` Vineet Gupta [this message]
2020-01-14 20:57   ` [RFC 1/4] asm-generic/uaccess: don't define inline functions if noinline lib/* in use Arnd Bergmann
2020-01-15 23:01     ` Vineet Gupta
2020-01-16 11:43       ` Arnd Bergmann
2020-01-14 21:32   ` Linus Torvalds
2020-01-15  9:08     ` Arnd Bergmann
2020-01-15 14:12       ` Al Viro
2020-01-15 14:21         ` Arnd Bergmann
2020-01-14 20:08 ` [RFC 2/4] lib/strncpy_from_user: Remove redundant user space pointer range check Vineet Gupta
2020-01-14 21:22   ` Linus Torvalds
2020-01-14 21:52     ` Vineet Gupta
2020-01-14 23:46     ` Al Viro
2020-01-15 14:42   ` Andrey Konovalov
2020-01-15 23:00     ` Vineet Gupta
2020-01-14 20:08 ` [RFC 3/4] ARC: uaccess: remove noinline variants of __strncpy_from_user() and friends Vineet Gupta
2020-01-14 20:08 ` [RFC 4/4] ARC: uaccess: use optimized generic __strnlen_user/__strncpy_from_user Vineet Gupta
2020-01-14 20:42   ` Arnd Bergmann
2020-01-14 21:36     ` Vineet Gupta
2020-01-14 21:49       ` Linus Torvalds
2020-01-14 22:14         ` Vineet Gupta

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