Vineet Gupta 55bb9480f9 ARC: [Review] Prevent incorrect syscall restarts ... Per Al Viro's "signals for dummies" https://lkml.org/lkml/2012/12/6/366 there are 3 golden rules for (not) restarting syscalls: " What we need to guarantee is * restarts do not happen on signals caught in interrupts or exceptions * restarts do not happen on signals caught in sigreturn() * restart should happen only once, even if we get through do_signal() many times." ARC Port already handled #1, this patch fixes #2 and #3. We use the additional state in pt_regs->orig_r8 to ckh if restarting has already been done once. Thanks to Al Viro for spotting this. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Al Viro <viro@ZenIV.linux.org.uk>		2013-02-15 23:15:50 +05:30
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boot	ARC: Build system: Makefiles, Kconfig, Linker script	2013-02-11 20:00:25 +05:30
include/asm	ARC: [Review] Prevent incorrect syscall restarts	2013-02-15 23:15:50 +05:30
kernel	ARC: [Review] Prevent incorrect syscall restarts	2013-02-15 23:15:50 +05:30
lib	ARC: String library	2013-02-11 20:00:35 +05:30
mm	ARC: uaccess friends	2013-02-11 20:00:31 +05:30
plat-arcfpga	ARC: Interrupt Handling	2013-02-11 20:00:37 +05:30
Kbuild	ARC: Build system: Makefiles, Kconfig, Linker script	2013-02-11 20:00:25 +05:30
Kconfig	ARC: Signal handling	2013-02-15 23:03:30 +05:30
Kconfig.debug	ARC: Build system: Makefiles, Kconfig, Linker script	2013-02-11 20:00:25 +05:30
Makefile	ARC: Build system: Makefiles, Kconfig, Linker script	2013-02-11 20:00:25 +05:30