[PATCH v2 0/2] Switching ARC to optimized generic strncpy_from_user

[PATCH v2 0/2] Switching ARC to optimized generic strncpy_from_user

[Vineet Gupta]

Hi,

This series switches ARC to generic word-at-a-time interface.

I understand that going fwd, we may drop the inline versions altogether but this
helps ARC code in the interim.

v2 <- v1
 - Moved __strnlen_user/__strncpy_from_user to under ifdef gaurd [Arnd]
 - Dropped the broken optimization patch [Linus]
 - Folded 2 ARC patches into 1

Thx,
-Vineet

Vineet Gupta (2):
  asm-generic/uaccess: don't define inline functions if noinline lib/*
    in use
  ARC: uaccess: use optimized generic __strnlen_user/__strncpy_from_user

 arch/arc/Kconfig               |  2 +
 arch/arc/include/asm/uaccess.h | 85 ++--------------------------------
 arch/arc/mm/extable.c          | 23 ---------
 include/asm-generic/uaccess.h  |  8 ++++
 4 files changed, 14 insertions(+), 104 deletions(-)

-- 
2.20.1


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[PATCH v2 1/2] asm-generic/uaccess: don't define inline functions if noinline lib/* in use

[Vineet Gupta]

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 | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h
index e935318804f8..2ea7f4e0e60e 100644
--- a/include/asm-generic/uaccess.h
+++ b/include/asm-generic/uaccess.h
@@ -212,6 +212,7 @@ static inline int __get_user_fn(size_t size, const void __user *ptr, void *x)
 
 extern int __get_user_bad(void) __attribute__((noreturn));
 
+#ifndef CONFIG_GENERIC_STRNCPY_FROM_USER
 /*
  * Copy a null terminated string from userspace.
  */
@@ -234,7 +235,11 @@ strncpy_from_user(char *dst, const char __user *src, long count)
 		return -EFAULT;
 	return __strncpy_from_user(dst, src, count);
 }
+#else
+extern long strncpy_from_user(char *dest, const char __user *src, long count);
+#endif
 
+#ifndef CONFIG_GENERIC_STRNLEN_USER
 /*
  * Return the size of a string (including the ending 0)
  *
@@ -255,6 +260,9 @@ static inline long strnlen_user(const char __user *src, long n)
 		return 0;
 	return __strnlen_user(src, n);
 }
+#else
+extern __must_check long strnlen_user(const char __user *str, long n);
+#endif
 
 /*
  * Zero Userspace
-- 
2.20.1


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[PATCH v2 2/2] ARC: uaccess: use optimized generic __strnlen_user/__strncpy_from_user

[Vineet Gupta]

The existing ARC variants have 2 issues
 - Use ZOL which may not be present in forthcoming architecture
 - Byte loop based vs. generic version which is word loop based

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
 arch/arc/Kconfig               |  2 +
 arch/arc/include/asm/uaccess.h | 85 ++--------------------------------
 arch/arc/mm/extable.c          | 23 ---------
 3 files changed, 6 insertions(+), 104 deletions(-)

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 26108ea785c2..3b074c4d31fb 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -26,6 +26,8 @@ config ARC
 	select GENERIC_PENDING_IRQ if SMP
 	select GENERIC_SCHED_CLOCK
 	select GENERIC_SMP_IDLE_THREAD
+	select GENERIC_STRNCPY_FROM_USER if MMU
+	select GENERIC_STRNLEN_USER if MMU
 	select HAVE_ARCH_KGDB
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_DEBUG_STACKOVERFLOW
diff --git a/arch/arc/include/asm/uaccess.h b/arch/arc/include/asm/uaccess.h
index ea40ec7f6cae..a3c943993b7b 100644
--- a/arch/arc/include/asm/uaccess.h
+++ b/arch/arc/include/asm/uaccess.h
@@ -52,6 +52,8 @@
 #define __access_ok(addr, sz)	(unlikely(__kernel_ok) || \
 				 likely(__user_ok((addr), (sz))))
 
+#define user_addr_max() 	(uaccess_kernel() ? ~0UL : get_fs())
+
 /*********** Single byte/hword/word copies ******************/
 
 #define __get_user_fn(sz, u, k)					\
@@ -613,7 +615,7 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n)
 	return res;
 }
 
-static inline unsigned long __arc_clear_user(void __user *to, unsigned long n)
+static inline unsigned long __clear_user(void __user *to, unsigned long n)
 {
 	long res = n;
 	unsigned char *d_char = to;
@@ -655,89 +657,10 @@ static inline unsigned long __arc_clear_user(void __user *to, unsigned long n)
 	return res;
 }
 
-static inline long
-__arc_strncpy_from_user(char *dst, const char __user *src, long count)
-{
-	long res = 0;
-	char val;
-
-	if (count == 0)
-		return 0;
-
-	__asm__ __volatile__(
-	"	mov	lp_count, %5		\n"
-	"	lp	3f			\n"
-	"1:	ldb.ab  %3, [%2, 1]		\n"
-	"	breq.d	%3, 0, 3f               \n"
-	"	stb.ab  %3, [%1, 1]		\n"
-	"	add	%0, %0, 1	# Num of NON NULL bytes copied	\n"
-	"3:								\n"
-	"	.section .fixup, \"ax\"		\n"
-	"	.align 4			\n"
-	"4:	mov %0, %4		# sets @res as -EFAULT	\n"
-	"	j   3b				\n"
-	"	.previous			\n"
-	"	.section __ex_table, \"a\"	\n"
-	"	.align 4			\n"
-	"	.word   1b, 4b			\n"
-	"	.previous			\n"
-	: "+r"(res), "+r"(dst), "+r"(src), "=r"(val)
-	: "g"(-EFAULT), "r"(count)
-	: "lp_count", "memory");
-
-	return res;
-}
-
-static inline long __arc_strnlen_user(const char __user *s, long n)
-{
-	long res, tmp1, cnt;
-	char val;
-
-	__asm__ __volatile__(
-	"	mov %2, %1			\n"
-	"1:	ldb.ab  %3, [%0, 1]		\n"
-	"	breq.d  %3, 0, 2f		\n"
-	"	sub.f   %2, %2, 1		\n"
-	"	bnz 1b				\n"
-	"	sub %2, %2, 1			\n"
-	"2:	sub %0, %1, %2			\n"
-	"3:	;nop				\n"
-	"	.section .fixup, \"ax\"		\n"
-	"	.align 4			\n"
-	"4:	mov %0, 0			\n"
-	"	j   3b				\n"
-	"	.previous			\n"
-	"	.section __ex_table, \"a\"	\n"
-	"	.align 4			\n"
-	"	.word 1b, 4b			\n"
-	"	.previous			\n"
-	: "=r"(res), "=r"(tmp1), "=r"(cnt), "=r"(val)
-	: "0"(s), "1"(n)
-	: "memory");
-
-	return res;
-}
-
-#ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
-
 #define INLINE_COPY_TO_USER
 #define INLINE_COPY_FROM_USER
 
-#define __clear_user(d, n)		__arc_clear_user(d, n)
-#define __strncpy_from_user(d, s, n)	__arc_strncpy_from_user(d, s, n)
-#define __strnlen_user(s, n)		__arc_strnlen_user(s, n)
-#else
-extern unsigned long arc_clear_user_noinline(void __user *to,
-		unsigned long n);
-extern long arc_strncpy_from_user_noinline (char *dst, const char __user *src,
-		long count);
-extern long arc_strnlen_user_noinline(const char __user *src, long n);
-
-#define __clear_user(d, n)		arc_clear_user_noinline(d, n)
-#define __strncpy_from_user(d, s, n)	arc_strncpy_from_user_noinline(d, s, n)
-#define __strnlen_user(s, n)		arc_strnlen_user_noinline(s, n)
-
-#endif
+#define __clear_user		__clear_user
 
 #include <asm/segment.h>
 #include <asm-generic/uaccess.h>
diff --git a/arch/arc/mm/extable.c b/arch/arc/mm/extable.c
index b06b09ddf924..88fa3a4d4906 100644
--- a/arch/arc/mm/extable.c
+++ b/arch/arc/mm/extable.c
@@ -22,26 +22,3 @@ int fixup_exception(struct pt_regs *regs)
 
 	return 0;
 }
-
-#ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
-
-unsigned long arc_clear_user_noinline(void __user *to,
-		unsigned long n)
-{
-	return __arc_clear_user(to, n);
-}
-EXPORT_SYMBOL(arc_clear_user_noinline);
-
-long arc_strncpy_from_user_noinline(char *dst, const char __user *src,
-		long count)
-{
-	return __arc_strncpy_from_user(dst, src, count);
-}
-EXPORT_SYMBOL(arc_strncpy_from_user_noinline);
-
-long arc_strnlen_user_noinline(const char __user *src, long n)
-{
-	return __arc_strnlen_user(src, n);
-}
-EXPORT_SYMBOL(arc_strnlen_user_noinline);
-#endif
-- 
2.20.1


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