[PATCH 2/2] arc: Fix xCCM size check

Alexey Brodkin
2016-12-22T14:09:10Z

CONFIG_ARC_ICCM_SZ in menuconfig is specified in kB while
"cpu->Xccm.sz" contains value in bytes thus direct comparison fails
leading to boot-time panic like that:
----------------------->8---------------------
IDENTITY : ARCVER [0x52] ARCNUM [0x1] CHIPID [ 0x0]
processor [1] : ARC HS38 R2.1 (ARCv2 ISA)
Timers : Timer0 Timer1 Local-64-bit-Ctr (not used)
ISA Extn : atomic ll64 unalign (not used)
: mpy[opt 9] div_rem norm barrel-shift swap minmax swape
BPU : full match, cache:2048, Predict Table:16384
MMU [v0] : 0k PAGE, JTLB 0 (0x0), uDTLB 0, uITLB 0
I-Cache : N/A
D-Cache : N/A
Peripherals : 0xf0000000, IO-Coherency (disabled)
Vector Table : 0x80000000
FPU : SP DP
DEBUG : ActionPoint smaRT RTT
Extn [CCM] : DCCM @ e0000000, 256 KB / ICCM: @ 60000000, 256 KB
OS ABI [v4] : 64-bit data any register aligned
Extn [SMP] : ARConnect (v2): 2 cores with IPI IDU DEBUG GFRC
Kernel panic - not syncing: Linux built with incorrect DCCM Size

---[ end Kernel panic - not syncing: Linux built with incorrect DCCM Size
----------------------->8---------------------

Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
Cc: Igor Guryanov <guryanov at synopsys.com>
Cc: stable at vger.kernel.org
---
arch/arc/kernel/setup.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
index ee574f37f365..601dab6fe5e0 100644
--- a/arch/arc/kernel/setup.c
+++ b/arch/arc/kernel/setup.c
@@ -333,12 +333,12 @@ static void arc_chk_core_config(void)
if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
panic("Linux built with incorrect DCCM Base address\n");

- if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
+ if (CONFIG_ARC_DCCM_SZ != TO_KB(cpu->dccm.sz))
panic("Linux built with incorrect DCCM Size\n");
#endif

#ifdef CONFIG_ARC_HAS_ICCM
- if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
+ if (CONFIG_ARC_ICCM_SZ != TO_KB(cpu->iccm.sz))
panic("Linux built with incorrect ICCM Size\n");
#endif

--
2.7.4