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authorThomas Gleixner <tglx@linutronix.de>2016-07-29 16:32:30 +0200
committerThomas Gleixner <tglx@linutronix.de>2016-07-29 18:44:14 +0200
commit784bdf3bb694b256fcd6120b93e8947a84249a3a (patch)
treecac56fdf1567db581d4f2a504dac6e75f878978d /include/soc
parente65805251f2db69c9f67ed8062ab82526be5a374 (diff)
downloadlinux-784bdf3bb694b256fcd6120b93e8947a84249a3a.tar.bz2
futex: Assume all mappings are private on !MMU systems
To quote Rick why there is no need for shared mapping on !MMU systems: |With MMU, shared futex keys need to identify the physical backing for |a memory address because it may be mapped at different addresses in |different processes (or even multiple times in the same process). |Without MMU this cannot happen. You only have physical addresses. So |the "private futex" behavior of using the virtual address as the key |is always correct (for both shared and private cases) on nommu |systems. This patch disables the FLAGS_SHARED in a way that allows the compiler to remove that code. [bigeasy: Added changelog ] Reported-by: Rich Felker <dalias@libc.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/20160729143230.GA21715@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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