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Remove the microblaze implemenation of strncpy/strnlen and instead use
the generic versions. The microblaze version is fairly slow because it
always does byte accesses even for aligned data, and it lacks a checks
for user_addr_max().
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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s/storign/storing/
Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Link: https://lore.kernel.org/r/20210319045323.21241-1-unixbhaskar@gmail.com
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
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Problem happens when len in strncpy_from_user is setup
and passing string has len-1 chars + \0 terminated
character. In this case was returned incorrect length
of the string.
It should always retunrs the length of the string
(not including the trailing NULL).
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
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If access to user space failed we need to reconstruct
stack pointer and restore all register.
This patch fixed problem introduces by:
"microblaze: Add loop unrolling for PAGE in copy_tofrom_user"
(sha1: ebe211254bfa6295f4ab0b33c7c881bdfabbab60)
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Use delay slot to speedup if maxlen is zero.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Increase performance by loop unrolling.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Save jump instruction for unaligned byte copying.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Change label name to be prepared for loop unrolling.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Move fixups below appropriate code.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Use label 0: for zero length copying and fixups.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Word copying is used only for aligned addresses.
Here is space for improving to use any better copying technique.
Look at memcpy implementation.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Cachegrind analysis need this fix to be able to log asm functions.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Signed-off-by: Michal Simek <monstr@monstr.eu>
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