Commit cea39477 authored by Vladimir Murzin's avatar Vladimir Murzin Committed by Russell King

ARM: 8775/1: NOMMU: Use instr_sync instead of plain isb in common code

Greg reported that commit 3c241210 ("ARM: 8756/1: NOMMU: Postpone
MPU activation till __after_proc_init") is causing breakage for the
old Versatile platform in no-MMU mode (with out-of-tree patches):

  AS      arch/arm/kernel/head-nommu.o
arch/arm/kernel/head-nommu.S: Assembler messages:
arch/arm/kernel/head-nommu.S:180: Error: selected processor does not support `isb' in ARM mode
scripts/Makefile.build:417: recipe for target 'arch/arm/kernel/head-nommu.o' failed
make[2]: *** [arch/arm/kernel/head-nommu.o] Error 1
Makefile:1034: recipe for target 'arch/arm/kernel' failed
make[1]: *** [arch/arm/kernel] Error 2

Since the code is common for all NOMMU builds usage of the isb was a
bad idea (please, note that isb also used in MPU related code which is
fine because MPU has dependency on CPU_V7/CPU_V7M), instead use more
robust instr_sync assembler macro.

Fixes: 3c241210 ("ARM: 8756/1: NOMMU: Postpone MPU activation till __after_proc_init")
Reported-by: default avatarGreg Ungerer <gerg@kernel.org>
Tested-by: default avatarGreg Ungerer <gerg@kernel.org>
Signed-off-by: default avatarVladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
parent ce397d21
...@@ -177,7 +177,7 @@ M_CLASS(streq r3, [r12, #PMSAv8_MAIR1]) ...@@ -177,7 +177,7 @@ M_CLASS(streq r3, [r12, #PMSAv8_MAIR1])
bic r0, r0, #CR_I bic r0, r0, #CR_I
#endif #endif
mcr p15, 0, r0, c1, c0, 0 @ write control reg mcr p15, 0, r0, c1, c0, 0 @ write control reg
isb instr_sync
#elif defined (CONFIG_CPU_V7M) #elif defined (CONFIG_CPU_V7M)
#ifdef CONFIG_ARM_MPU #ifdef CONFIG_ARM_MPU
ldreq r3, [r12, MPU_CTRL] ldreq r3, [r12, MPU_CTRL]
......
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