ARC: [kbuild] Allow platforms to disable LLSC for !SMP as well (fbf8e13d) · Commits · 戴 / test

Currently ARC_HAS_LLSC can be influenced by platform for SMP only using ARC_HAS_COH_LLSC. For !SMP it defaults to "y". It turns out that some customers can't support it all, even in UP. So we change the semantics, and use a negative dependency ARC_CANT_LLSC. Any platform (independent of SMP or !SMP) can select it to disable LLSC. Signed-off-by:

Vineet Gupta <vgupta@synopsys.com>

arch/arc/Kconfig

+4 −6

Original line number	Diff line number	Diff line
		@@ -134,9 +134,6 @@ if SMP
		config ARC_HAS_COH_CACHES
		def_bool n

		config ARC_HAS_COH_LLSC
		def_bool n

		config ARC_HAS_COH_RTSC
		def_bool n

		@@ -304,6 +301,9 @@ config ARC_FPU_SAVE_RESTORE
		based on actual usage of FPU by a task. Thus our implemn does
		this for all tasks in system.

		config ARC_CANT_LLSC
		def_bool n

		menuconfig ARC_CPU_REL_4_10
		bool "Enable support for Rel 4.10 features"
		default n
		@@ -314,9 +314,7 @@ menuconfig ARC_CPU_REL_4_10
		config ARC_HAS_LLSC
		bool "Insn: LLOCK/SCOND (efficient atomic ops)"
		default y
		depends on ARC_CPU_770
		# if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
		depends on !SMP \|\| ARC_HAS_COH_LLSC
		depends on ARC_CPU_770 && !ARC_CANT_LLSC

		config ARC_HAS_SWAPE
		bool "Insn: SWAPE (endian-swap)"

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