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Message-Id: <8f8c6ea486fc69e3020fe99718d9c4b38cbaf8ba.1422455352.git.jslaby@suse.cz> Date: Wed, 28 Jan 2015 15:29:17 +0100 From: Jiri Slaby <jslaby@...e.cz> To: stable@...r.kernel.org Cc: linux-kernel@...r.kernel.org, Richard Weinberger <richard@....at>, Jiri Slaby <jslaby@...e.cz> Subject: [PATCH 3.12 127/176] um: Skip futex_atomic_cmpxchg_inatomic() test From: Richard Weinberger <richard@....at> 3.12-stable review patch. If anyone has any objections, please let me know. =============== commit f911d731054ab3d82ee72a16b889e17ca3a2332a upstream. futex_atomic_cmpxchg_inatomic() does not work on UML because it triggers a copy_from_user() in kernel context. On UML copy_from_user() can only be used if the kernel was called by a real user space process such that UML can use ptrace() to fetch the value. Reported-by: Miklos Szeredi <miklos@...redi.hu> Suggested-by: Geert Uytterhoeven <geert@...ux-m68k.org> Signed-off-by: Richard Weinberger <richard@....at> Tested-by: Daniel Walter <d.walter@...0.at> Signed-off-by: Jiri Slaby <jslaby@...e.cz> --- arch/um/Kconfig.common | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/um/Kconfig.common b/arch/um/Kconfig.common index 8ddea1f8006a..0228a6ab9b18 100644 --- a/arch/um/Kconfig.common +++ b/arch/um/Kconfig.common @@ -7,6 +7,7 @@ config UML bool default y select HAVE_UID16 + select HAVE_FUTEX_CMPXCHG if FUTEX select GENERIC_IRQ_SHOW select GENERIC_CPU_DEVICES select GENERIC_IO -- 2.2.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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