[PATCH] Fix sb_edac compilation with 32 bits kernels

Mauro Carvalho Chehab
2011-11-07T21:29:51Z

Em 03-11-2011 12:07, Josh Boyer escreveu:
> Hi,
>
> It seems the newly added EDAC driver for SandyBridge won't build on
> 32-bit x86 because of a 64-bit divide somewhere:
>
> drivers/edac/sb_edac.c: In function 'get_memory_error_data':
> drivers/edac/sb_edac.c:861:2: warning: left shift count >= width of type
> [enabled by default]
> <snip>
> ERROR: "__udivdi3" [drivers/edac/sb_edac.ko] undefined!
> make[1]: *** [__modpost] Error 1
> make: *** [modules] Error 2
>
> You can find the full build log here:
>
> http://koji.fedoraproject.org/koji/getfile?taskID=3482579&name=build.log
>
> Before I go digging into where this is done and what to do about it, I
> do want to confirm that it is supposed to work on a 32-bit kernel,
> correct?

Ok, I found some spare time to work on a patch for fixing it.
As Tony pointed, it probably doesn't make much sense on running
this driver with 32 bits, nor I tested the patch, but, in any case,
the fix is trivial.

Regards,
Mauro

-

From: Mauro Carvalho Chehab <mchehab@redhat.com>
Date: Mon, 7 Nov 2011 19:26:53 -0200

As reported by Josh Boyer <jwboyer@redhat.com>:
> drivers/edac/sb_edac.c: In function 'get_memory_error_data':
> drivers/edac/sb_edac.c:861:2: warning: left shift count >= width of type
> [enabled by default]
> <snip>
> ERROR: "__udivdi3" [drivers/edac/sb_edac.ko] undefined!
> make[1]: *** [__modpost] Error 1
> make: *** [modules] Error 2

PS.: compile-tested only

Reported-by: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 5948a21..203361e 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -214,7 +214,7 @@ config EDAC_I7300

config EDAC_SBRIDGE
tristate "Intel Sandy-Bridge Integrated MC"
- depends on EDAC_MM_EDAC && PCI && X86_64 && X86_MCE_INTEL
+ depends on EDAC_MM_EDAC && PCI && X86 && X86_MCE_INTEL
depends on EXPERIMENTAL
help
Support for error detection and correction the Intel
diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
index 7a402bf..10927ff 100644
--- a/drivers/edac/sb_edac.c
+++ b/drivers/edac/sb_edac.c
@@ -20,6 +20,7 @@
#include <linux/mmzone.h>
#include <linux/smp.h>
#include <linux/bitmap.h>
+#include <linux/math64.h>
#include <asm/processor.h>
#include <asm/mce.h>

@@ -670,6 +671,7 @@ static void get_memory_layout(const struct mem_ctl_info *mci)
u32 reg;
u64 limit, prv = 0;
u64 tmp_mb;
+ u32 mb, kb;
u32 rir_way;

/*
@@ -682,8 +684,9 @@ static void get_memory_layout(const struct mem_ctl_info *mci)
pvt->tolm = GET_TOLM(reg);
tmp_mb = (1 + pvt->tolm) >> 20;

- debugf0("TOLM: %Lu.%03Lu GB (0x%016Lx)\n",
- tmp_mb / 1000, tmp_mb % 1000, (u64)pvt->tolm);
+ mb = div_u64_rem(tmp_mb, 1000, &kb);
+ debugf0("TOLM: %u.%03u GB (0x%016Lx)\n",
+ mb, kb, (u64)pvt->tolm);

/* Address range is already 45:25 */
pci_read_config_dword(pvt->pci_sad1, TOHM,
@@ -691,8 +694,9 @@ static void get_memory_layout(const struct mem_ctl_info *mci)
pvt->tohm = GET_TOHM(reg);
tmp_mb = (1 + pvt->tohm) >> 20;

- debugf0("TOHM: %Lu.%03Lu GB (0x%016Lx)",
- tmp_mb / 1000, tmp_mb % 1000, (u64)pvt->tohm);
+ mb = div_u64_rem(tmp_mb, 1000, &kb);
+ debugf0("TOHM: %u.%03u GB (0x%016Lx)",
+ mb, kb, (u64)pvt->tohm);

/*
* Step 2) Get SAD range and SAD Interleave list
@@ -714,10 +718,11 @@ static void get_memory_layout(const struct mem_ctl_info *mci)
break;

tmp_mb = (limit + 1) >> 20;
- debugf0("SAD#%d %s up to %Lu.%03Lu GB (0x%016Lx) %s reg=0x%08x\n",
+ mb = div_u64_rem(tmp_mb, 1000, &kb);
+ debugf0("SAD#%d %s up to %u.%03u GB (0x%016Lx) %s reg=0x%08x\n",
n_sads,
get_dram_attr(reg),
- tmp_mb / 1000, tmp_mb % 1000,
+ mb, kb,
((u64)tmp_mb) << 20L,
INTERLEAVE_MODE(reg) ? "Interleave: 8:6" : "Interleave: [8:6]XOR[18:16]",
reg);
@@ -747,8 +752,9 @@ static void get_memory_layout(const struct mem_ctl_info *mci)
break;
tmp_mb = (limit + 1) >> 20;

- debugf0("TAD#%d: up to %Lu.%03Lu GB (0x%016Lx), socket interleave %d, memory interleave %d, TGT: %d, %d, %d, %d, reg=0x%08x\n",
- n_tads, tmp_mb / 1000, tmp_mb % 1000,
+ mb = div_u64_rem(tmp_mb, 1000, &kb);
+ debugf0("TAD#%d: up to %u.%03u GB (0x%016Lx), socket interleave %d, memory interleave %d, TGT: %d, %d, %d, %d, reg=0x%08x\n",
+ n_tads, mb, kb,
((u64)tmp_mb) << 20L,
(u32)TAD_SOCK(reg),
(u32)TAD_CH(reg),
@@ -771,9 +777,10 @@ static void get_memory_layout(const struct mem_ctl_info *mci)
tad_ch_nilv_offset[j],
&reg);
tmp_mb = TAD_OFFSET(reg) >> 20;
- debugf0("TAD CH#%d, offset #%d: %Lu.%03Lu GB (0x%016Lx), reg=0x%08x\n",
+ mb = div_u64_rem(tmp_mb, 1000, &kb);
+ debugf0("TAD CH#%d, offset #%d: %u.%03u GB (0x%016Lx), reg=0x%08x\n",
i, j,
- tmp_mb / 1000, tmp_mb % 1000,
+ mb, kb,
((u64)tmp_mb) << 20L,
reg);
}
@@ -795,9 +802,10 @@ static void get_memory_layout(const struct mem_ctl_info *mci)

tmp_mb = RIR_LIMIT(reg) >> 20;
rir_way = 1 << RIR_WAY(reg);
- debugf0("CH#%d RIR#%d, limit: %Lu.%03Lu GB (0x%016Lx), way: %d, reg=0x%08x\n",
+ mb = div_u64_rem(tmp_mb, 1000, &kb);
+ debugf0("CH#%d RIR#%d, limit: %u.%03u GB (0x%016Lx), way: %d, reg=0x%08x\n",
i, j,
- tmp_mb / 1000, tmp_mb % 1000,
+ mb, kb,
((u64)tmp_mb) << 20L,
rir_way,
reg);
@@ -808,9 +816,10 @@ static void get_memory_layout(const struct mem_ctl_info *mci)
&reg);
tmp_mb = RIR_OFFSET(reg) << 6;

- debugf0("CH#%d RIR#%d INTL#%d, offset %Lu.%03Lu GB (0x%016Lx), tgt: %d, reg=0x%08x\n",
+ mb = div_u64_rem(tmp_mb, 1000, &kb);
+ debugf0("CH#%d RIR#%d INTL#%d, offset %u.%03u GB (0x%016Lx), tgt: %d, reg=0x%08x\n",
i, j, k,
- tmp_mb / 1000, tmp_mb % 1000,
+ mb, kb,
((u64)tmp_mb) << 20L,
(u32)RIR_RNK_TGT(reg),
reg);
@@ -848,6 +857,7 @@ static int get_memory_error_data(struct mem_ctl_info *mci,
u8 ch_way,sck_way;
u32 tad_offset;
u32 rir_way;
+ u32 mb, kb;
u64 ch_addr, offset, limit, prv = 0;

@@ -858,7 +868,7 @@ static int get_memory_error_data(struct mem_ctl_info *mci,
* range (e. g. VGA addresses). It is unlikely, however, that the
* memory controller would generate an error on that range.
*/
- if ((addr > (u64) pvt->tolm) && (addr < (1L << 32))) {
+ if ((addr > (u64) pvt->tolm) && (addr < (1LL << 32))) {
sprintf(msg, "Error at TOLM area, on addr 0x%08Lx", addr);
edac_mc_handle_ce_no_info(mci, msg);
return -EINVAL;
@@ -1053,7 +1063,7 @@ static int get_memory_error_data(struct mem_ctl_info *mci,
ch_addr = addr & 0x7f;
/* Remove socket wayness and remove 6 bits */
addr >>= 6;
- addr /= sck_xch;
+ addr = div_u64(addr, sck_xch);
#if 0
/* Divide by channel way */
addr = addr / ch_way;
@@ -1073,10 +1083,10 @@ static int get_memory_error_data(struct mem_ctl_info *mci,
continue;

limit = RIR_LIMIT(reg);
-
- debugf0("RIR#%d, limit: %Lu.%03Lu GB (0x%016Lx), way: %d\n",
+ mb = div_u64_rem(limit >> 20, 1000, &kb);
+ debugf0("RIR#%d, limit: %u.%03u GB (0x%016Lx), way: %d\n",
n_rir,
- (limit >> 20) / 1000, (limit >> 20) % 1000,
+ mb, kb,
limit,
1 << RIR_WAY(reg));
if (ch_addr <= limit)