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uclibc: arc: Disable usage of atomic ops if hardware has no LLSC

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Since uClibc-ng v1.0.20 we can force libc to either use llock/scond
instructions for atomic ops or if those are missing use kernel-assisted
emulation. By default atomics are used so we disable that feature in
libc if we build for a target without LLSC.

This allows us to build and use NPTL on ARC750 for example which was not
possible before.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Alexey Brodkin 2017-04-19 20:48:57 +03:00 committed by Thomas Petazzoni
parent a497a9fd6c
commit 64c67e07fa
1 changed files with 7 additions and 0 deletions
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7
package/uclibc/uclibc.mk
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@ -101,6 +101,12 @@ define UCLIBC_ARC_PAGE_SIZE_CONFIG
$(call KCONFIG_ENABLE_OPT,$(UCLIBC_ARC_PAGE_SIZE),$(@D)/.config)
endef
ifeq ($(BR2_ARC_ATOMIC_EXT),)
define UCLIBC_ARC_ATOMICS_CONFIG
$(call KCONFIG_DISABLE_OPT,CONFIG_ARC_HAS_ATOMICS,$(@D)/.config)
endef
endif
endif # arc
#
@ -395,6 +401,7 @@ define UCLIBC_KCONFIG_FIXUP_CMDS
$(UCLIBC_BINFMT_CONFIG)
$(UCLIBC_ARC_TYPE_CONFIG)
$(UCLIBC_ARC_PAGE_SIZE_CONFIG)
$(UCLIBC_ARC_ATOMICS_CONFIG)
$(UCLIBC_ARM_ABI_CONFIG)
$(UCLIBC_ARM_BINFMT_FLAT)
$(UCLIBC_ARM_NO_CONTEXT_FUNCS)