Commit 64c5e530 authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
Browse files

Merge tag 'arc-4.19-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc 

Vineet writes:
   "ARC updates for 4.19-rc8
    - Fix clone syscall to update Thread pointer register
    - Make/build updates (needed for AGL/OE builds)   [Alexey]
    - Typo fix [Colin Ian King]"

* tag 'arc-4.19-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: clone syscall to setp r25 as thread pointer
  ARC: build: Don't set CROSS_COMPILE in arch's Makefile
  ARC: fix spelling mistake "entires" -> "entries"
  ARC: build: Get rid of toolchain check
  ARCv2: build: use mcpu=hs38 iso generic mcpu=archs
parents 0854ba5f c58a584f

arch/arc/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -149,7 +149,7 @@ config ARC_CPU_770 
	  Support for ARC770 core introduced with Rel 4.10 (Summer 2011)

	  This core has a bunch of cool new features:

	  -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)

                   Shared Address Spaces (for sharing TLB entires in MMU)

                   Shared Address Spaces (for sharing TLB entries in MMU)

	  -Caches: New Prog Model, Region Flush

	  -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr

arch/arc/Makefile

+2 −24
Original line number Diff line number Diff line
@@ -6,33 +6,11 @@ 
# published by the Free Software Foundation.

#



ifeq ($(CROSS_COMPILE),)

ifndef CONFIG_CPU_BIG_ENDIAN

CROSS_COMPILE := arc-linux-

else

CROSS_COMPILE := arceb-linux-

endif

endif



KBUILD_DEFCONFIG := nsim_700_defconfig



cflags-y	+= -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__

cflags-$(CONFIG_ISA_ARCOMPACT)	+= -mA7

cflags-$(CONFIG_ISA_ARCV2)	+= -mcpu=archs



is_700 = $(shell $(CC) -dM -E - < /dev/null | grep -q "ARC700" && echo 1 || echo 0)



ifdef CONFIG_ISA_ARCOMPACT

ifeq ($(is_700), 0)

    $(error Toolchain not configured for ARCompact builds)

endif

endif



ifdef CONFIG_ISA_ARCV2

ifeq ($(is_700), 1)

    $(error Toolchain not configured for ARCv2 builds)

endif

endif

cflags-$(CONFIG_ISA_ARCV2)	+= -mcpu=hs38



ifdef CONFIG_ARC_CURR_IN_REG

# For a global register defintion, make sure it gets passed to every file
@@ -79,7 +57,7 @@ cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp 
cflags-$(CONFIG_CPU_BIG_ENDIAN)		+= -mbig-endian

ldflags-$(CONFIG_CPU_BIG_ENDIAN)	+= -EB



LIBGCC	:= $(shell $(CC) $(cflags-y) --print-libgcc-file-name)

LIBGCC	= $(shell $(CC) $(cflags-y) --print-libgcc-file-name)



# Modules with short calls might break for calls into builtin-kernel

KBUILD_CFLAGS_MODULE	+= -mlong-calls -mno-millicode

arch/arc/kernel/process.c

+20 −0
Original line number Diff line number Diff line
@@ -241,6 +241,26 @@ int copy_thread(unsigned long clone_flags, 
		task_thread_info(current)->thr_ptr;

	}





	/*

	 * setup usermode thread pointer #1:

	 * when child is picked by scheduler, __switch_to() uses @c_callee to

	 * populate usermode callee regs: this works (despite being in a kernel

	 * function) since special return path for child @ret_from_fork()

	 * ensures those regs are not clobbered all the way to RTIE to usermode

	 */

	c_callee->r25 = task_thread_info(p)->thr_ptr;



#ifdef CONFIG_ARC_CURR_IN_REG

	/*

	 * setup usermode thread pointer #2:

	 * however for this special use of r25 in kernel, __switch_to() sets

	 * r25 for kernel needs and only in the final return path is usermode

	 * r25 setup, from pt_regs->user_r25. So set that up as well

	 */

	c_regs->user_r25 = c_callee->r25;

#endif



	return 0;

}

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