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microblaze: fix clone syscall

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Fix inadvertent breakage in the clone syscall ABI for Microblaze that
was introduced in commit f3268edbe6 ("microblaze: switch to generic
fork/vfork/clone").

The Microblaze syscall ABI for clone takes the parent tid address in the
4th argument; the third argument slot is used for the stack size.  The
incorrectly-used CLONE_BACKWARDS type assigned parent tid to the 3rd
slot.

This commit restores the original ABI so that existing userspace libc
code will work correctly.

All kernel versions from v3.8-rc1 were affected.

Signed-off-by: Michal Simek <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michal Simek 2013-08-13 16:00:53 -07:00 • committed by Linus Torvalds
commit dfa9771a7c
4 changed files with 18 additions and 1 deletions
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2
arch/microblaze/Kconfig
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@ -28,7 +28,7 @@ config MICROBLAZE
select GENERIC_CLOCKEVENTS
select GENERIC_IDLE_POLL_SETUP
select MODULES_USE_ELF_RELA
select CLONE_BACKWARDS
select CLONE_BACKWARDS3
config SWAP
def_bool n