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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2014-11-02 15:32:42 +0100
committerMichael Ellerman <mpe@ellerman.id.au>2014-11-14 07:24:20 +0100
commit9e819963b45f79e87f5a8c44960a66c0727c80e6 (patch)
tree5ca6d6789d14e51beb73c21d891e511bc442f277 /arch/powerpc/kernel/prom.c
parentpowerpc/xmon: Fix build when 4xx=y and 44x=n (diff)
downloadlinux-9e819963b45f79e87f5a8c44960a66c0727c80e6.tar.xz
linux-9e819963b45f79e87f5a8c44960a66c0727c80e6.zip
powerpc: Disable CPU_FTR_TM if TM is disabled by firmware
Firmware is allowed to communicate to us via the "ibm,pa-features" property that TM (Transactional Memory) support is disabled. Currently this doesn't happen on any platform we're aware of, but we should honor it anyway. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/prom.c')
-rw-r--r--arch/powerpc/kernel/prom.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 6af05fc1dec9..6a799b3cc6b4 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -160,6 +160,12 @@ static struct ibm_pa_feature {
{CPU_FTR_NODSISRALIGN, 0, 0, 1, 1, 1},
{0, MMU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0},
{CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
+ /*
+ * If the kernel doesn't support TM (ie. CONFIG_PPC_TRANSACTIONAL_MEM=n),
+ * we don't want to turn on CPU_FTR_TM here, so we use CPU_FTR_TM_COMP
+ * which is 0 if the kernel doesn't support TM.
+ */
+ {CPU_FTR_TM_COMP, 0, 0, 22, 0, 0},
};
static void __init scan_features(unsigned long node, const unsigned char *ftrs,