x86: opt into HAVE_COPY_THREAD_TLS, for both 32-bit and 64-bit

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For 32-bit userspace on a 64-bit kernel, this requires modifying
stub32_clone to actually swap the appropriate arguments to match
CONFIG_CLONE_BACKWARDS, rather than just leaving the C argument for tls
broken.

Patch co-authored by Josh Triplett and Thiago Macieira.

Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Thiago Macieira <thiago.macieira@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

...

This commit is contained in:

Josh Triplett 2015-06-30 15:00:00 -07:00 • committed by Linus Torvalds

parent 2026302909

commit c1bd55f922

3 changed files with 8 additions and 7 deletions

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1

arch/x86/Kconfig

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6

arch/x86/kernel/process_32.c

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8

arch/x86/kernel/process_64.c

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