[PATCH EDAC v26 03/66] edac: Don't initialize csrow's first_page & friends when not needed

[Mauro Carvalho Chehab <mchehab@redhat.com>]

Almost all edac	drivers	initialize csrow_info->first_page,
csrow_info->last_page and csrow_info->page_mask. Those vars are
used inside the EDAC core, in order to calculate the csrow affected
by an error, by using the routine edac_mc_find_csrow_by_page().

However, very few drivers actually use it:
        e752x_edac.c
        e7xxx_edac.c
        i3000_edac.c
        i82443bxgx_edac.c
        i82860_edac.c
        i82875p_edac.c
        i82975x_edac.c
        r82600_edac.c

There also a few other drivers that have their own calculus
formula internally using those vars.

All the others are just wasting time by initializing those
data.

While initializing data without using them won't cause any troubles, as
those information is stored at the wrong place (at csrows structure), it
is better to remove what is unused, in order to simplify the next patch.

Reviewed-by: Aristeu Rozanski <arozansk@redhat.com>
Acked-by: Borislav Petkov <borislav.petkov@amd.com>
Acked-by: Chris Metcalf <cmetcalf@tilera.com>
Cc: Doug Thompson <norsk5@yahoo.com>
Cc: Hitoshi Mitake <h.mitake@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: "Niklas Söderlund" <niklas.soderlund@ericsson.com>
Cc: Josh Boyer <jwboyer@gmail.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---
 drivers/edac/amd64_edac.c   |   37 ++-----------------------------------
 drivers/edac/i3200_edac.c   |    5 -----
 drivers/edac/i5000_edac.c   |    5 -----
 drivers/edac/i5100_edac.c   |    2 --
 drivers/edac/i5400_edac.c   |    5 -----
 drivers/edac/i7300_edac.c   |    5 +----
 drivers/edac/i7core_edac.c  |    5 -----
 drivers/edac/mv64x60_edac.c |    1 -
 drivers/edac/ppc4xx_edac.c  |    7 -------
 drivers/edac/sb_edac.c      |    2 --
 drivers/edac/tile_edac.c    |    2 --
 drivers/edac/x38_edac.c     |    5 -----
 12 files changed, 3 insertions(+), 78 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 8126db0..e2c5a94 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -715,25 +715,6 @@ static inline u64 input_addr_to_sys_addr(struct mem_ctl_info *mci,
 				     input_addr_to_dram_addr(mci, input_addr));
 }
 
-/*
- * Find the minimum and maximum InputAddr values that map to the given @csrow.
- * Pass back these values in *input_addr_min and *input_addr_max.
- */
-static void find_csrow_limits(struct mem_ctl_info *mci, int csrow,
-			      u64 *input_addr_min, u64 *input_addr_max)
-{
-	struct amd64_pvt *pvt;
-	u64 base, mask;
-
-	pvt = mci->pvt_info;
-	BUG_ON((csrow < 0) || (csrow >= pvt->csels[0].b_cnt));
-
-	get_cs_base_and_mask(pvt, csrow, 0, &base, &mask);
-
-	*input_addr_min = base & ~mask;
-	*input_addr_max = base | mask;
-}
-
 /* Map the Error address to a PAGE and PAGE OFFSET. */
 static inline void error_address_to_page_and_offset(u64 error_address,
 						    u32 *page, u32 *offset)
@@ -2185,7 +2166,7 @@ static int init_csrows(struct mem_ctl_info *mci)
 {
 	struct csrow_info *csrow;
 	struct amd64_pvt *pvt = mci->pvt_info;
-	u64 input_addr_min, input_addr_max, sys_addr, base, mask;
+	u64 base, mask;
 	u32 val;
 	int i, j, empty = 1;
 	enum mem_type mtype;
@@ -2216,28 +2197,14 @@ static int init_csrows(struct mem_ctl_info *mci)
 			csrow->nr_pages = amd64_csrow_nr_pages(pvt, 0, i);
 		if (csrow_enabled(i, 1, pvt))
 			csrow->nr_pages += amd64_csrow_nr_pages(pvt, 1, i);
-		find_csrow_limits(mci, i, &input_addr_min, &input_addr_max);
-		sys_addr = input_addr_to_sys_addr(mci, input_addr_min);
-		csrow->first_page = (u32) (sys_addr >> PAGE_SHIFT);
-		sys_addr = input_addr_to_sys_addr(mci, input_addr_max);
-		csrow->last_page = (u32) (sys_addr >> PAGE_SHIFT);
 
 		get_cs_base_and_mask(pvt, i, 0, &base, &mask);
-		csrow->page_mask = ~mask;
 		/* 8 bytes of resolution */
 
 		mtype = amd64_determine_memory_type(pvt, i);
 
 		debugf1("  for MC node %d csrow %d:\n", pvt->mc_node_id, i);
-		debugf1("    input_addr_min: 0x%lx input_addr_max: 0x%lx\n",
-			(unsigned long)input_addr_min,
-			(unsigned long)input_addr_max);
-		debugf1("    sys_addr: 0x%lx  page_mask: 0x%lx\n",
-			(unsigned long)sys_addr, csrow->page_mask);
-		debugf1("    nr_pages: %u  first_page: 0x%lx "
-			"last_page: 0x%lx\n",
-			(unsigned)csrow->nr_pages,
-			csrow->first_page, csrow->last_page);
+		debugf1("    nr_pages: %u\n", csrow->nr_pages);
 
 		/*
 		 * determine whether CHIPKILL or JUST ECC or NO ECC is operating
diff --git a/drivers/edac/i3200_edac.c b/drivers/edac/i3200_edac.c
index 6ae3017..93c4d5a 100644
--- a/drivers/edac/i3200_edac.c
+++ b/drivers/edac/i3200_edac.c
@@ -321,7 +321,6 @@ static int i3200_probe1(struct pci_dev *pdev, int dev_idx)
 	int rc;
 	int i, j;
 	struct mem_ctl_info *mci = NULL;
-	unsigned long last_page;
 	u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL];
 	bool stacked;
 	void __iomem *window;
@@ -366,7 +365,6 @@ static int i3200_probe1(struct pci_dev *pdev, int dev_idx)
 	 * cumulative; the last one will contain the total memory
 	 * contained in all ranks.
 	 */
-	last_page = -1UL;
 	for (i = 0; i < mci->nr_csrows; i++) {
 		unsigned long nr_pages;
 		struct csrow_info *csrow = &mci->csrows[i];
@@ -378,9 +376,6 @@ static int i3200_probe1(struct pci_dev *pdev, int dev_idx)
 		if (nr_pages == 0)
 			continue;
 
-		csrow->first_page = last_page + 1;
-		last_page += nr_pages;
-		csrow->last_page = last_page;
 		csrow->nr_pages = nr_pages;
 
 		for (j = 0; j < nr_channels; j++) {
diff --git a/drivers/edac/i5000_edac.c b/drivers/edac/i5000_edac.c
index 95966ba..26b4055 100644
--- a/drivers/edac/i5000_edac.c
+++ b/drivers/edac/i5000_edac.c
@@ -1263,11 +1263,6 @@ static int i5000_init_csrows(struct mem_ctl_info *mci)
 		if (!MTR_DIMMS_PRESENT(mtr) && !MTR_DIMMS_PRESENT(mtr1))
 			continue;
 
-		/* FAKE OUT VALUES, FIXME */
-		p_csrow->first_page = 0 + csrow * 20;
-		p_csrow->last_page = 9 + csrow * 20;
-		p_csrow->page_mask = 0xFFF;
-
 		csrow_megs = 0;
 		for (channel = 0; channel < pvt->maxch; channel++) {
 			csrow_megs += pvt->dimm_info[csrow][channel].megabytes;
diff --git a/drivers/edac/i5100_edac.c b/drivers/edac/i5100_edac.c
index 6c0dafa..5338c79 100644
--- a/drivers/edac/i5100_edac.c
+++ b/drivers/edac/i5100_edac.c
@@ -859,8 +859,6 @@ static void __devinit i5100_init_csrows(struct mem_ctl_info *mci)
 		 * FIXME: these two are totally bogus -- I don't see how to
 		 * map them correctly to this structure...
 		 */
-		mci->csrows[i].first_page = total_pages;
-		mci->csrows[i].last_page = total_pages + npages - 1;
 		mci->csrows[i].nr_pages = npages;
 		mci->csrows[i].csrow_idx = i;
 		mci->csrows[i].mci = mci;
diff --git a/drivers/edac/i5400_edac.c b/drivers/edac/i5400_edac.c
index c2379ba..6f85dcb 100644
--- a/drivers/edac/i5400_edac.c
+++ b/drivers/edac/i5400_edac.c
@@ -1180,11 +1180,6 @@ static int i5400_init_csrows(struct mem_ctl_info *mci)
 		if (!MTR_DIMMS_PRESENT(mtr))
 			continue;
 
-		/* FAKE OUT VALUES, FIXME */
-		p_csrow->first_page = 0 + csrow * 20;
-		p_csrow->last_page = 9 + csrow * 20;
-		p_csrow->page_mask = 0xFFF;
-
 		csrow_megs = 0;
 		for (channel = 0; channel < pvt->maxch; channel++) {
 			csrow_megs += pvt->dimm_info[csrow][channel].megabytes;
diff --git a/drivers/edac/i7300_edac.c b/drivers/edac/i7300_edac.c
index 4bfcb3d..d4153d6 100644
--- a/drivers/edac/i7300_edac.c
+++ b/drivers/edac/i7300_edac.c
@@ -778,7 +778,7 @@ static int i7300_init_csrows(struct mem_ctl_info *mci)
 	int rc = -ENODEV;
 	int mtr;
 	int ch, branch, slot, channel;
-	u32 last_page = 0, nr_pages;
+	u32 nr_pages;
 	struct dimm_info *dimm;
 
 	pvt = mci->pvt_info;
@@ -828,9 +828,6 @@ static int i7300_init_csrows(struct mem_ctl_info *mci)
 
 				/* Update per_csrow memory count */
 				p_csrow->nr_pages += nr_pages;
-				p_csrow->first_page = last_page;
-				last_page += nr_pages;
-				p_csrow->last_page = last_page;
 
 				rc = 0;
 			}
diff --git a/drivers/edac/i7core_edac.c b/drivers/edac/i7core_edac.c
index 5449bd4..76c957c 100644
--- a/drivers/edac/i7core_edac.c
+++ b/drivers/edac/i7core_edac.c
@@ -599,7 +599,6 @@ static int get_dimm_config(struct mem_ctl_info *mci)
 	struct pci_dev *pdev;
 	int i, j;
 	int csrow = 0;
-	unsigned long last_page = 0;
 	enum edac_type mode;
 	enum mem_type mtype;
 	struct dimm_info *dimm;
@@ -716,12 +715,8 @@ static int get_dimm_config(struct mem_ctl_info *mci)
 			npages = MiB_TO_PAGES(size);
 
 			csr = &mci->csrows[csrow];
-			csr->first_page = last_page + 1;
-			last_page += npages;
-			csr->last_page = last_page;
 			csr->nr_pages = npages;
 
-			csr->page_mask = 0;
 			csr->csrow_idx = csrow;
 			csr->nr_channels = 1;
 
diff --git a/drivers/edac/mv64x60_edac.c b/drivers/edac/mv64x60_edac.c
index 12d7fe0..d2e3c39 100644
--- a/drivers/edac/mv64x60_edac.c
+++ b/drivers/edac/mv64x60_edac.c
@@ -668,7 +668,6 @@ static void mv64x60_init_csrows(struct mem_ctl_info *mci,
 	csrow = &mci->csrows[0];
 	dimm = csrow->channels[0].dimm;
 	csrow->nr_pages = pdata->total_mem >> PAGE_SHIFT;
-	csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
 	dimm->grain = 8;
 
 	dimm->mtype = (ctl & MV64X60_SDRAM_REGISTERED) ? MEM_RDDR : MEM_DDR;
diff --git a/drivers/edac/ppc4xx_edac.c b/drivers/edac/ppc4xx_edac.c
index a75e567..ec5e529 100644
--- a/drivers/edac/ppc4xx_edac.c
+++ b/drivers/edac/ppc4xx_edac.c
@@ -897,7 +897,6 @@ ppc4xx_edac_init_csrows(struct mem_ctl_info *mci, u32 mcopt1)
 	enum edac_type edac_mode;
 	int row, j;
 	u32 mbxcf, size;
-	static u32 ppc4xx_last_page;
 
 	/* Establish the memory type and width */
 
@@ -959,10 +958,6 @@ ppc4xx_edac_init_csrows(struct mem_ctl_info *mci, u32 mcopt1)
 			goto done;
 		}
 
-		csi->first_page = ppc4xx_last_page;
-		csi->last_page	= csi->first_page + csi->nr_pages - 1;
-		csi->page_mask	= 0;
-
 		/*
 		 * It's unclear exactly what grain should be set to
 		 * here. The SDRAM_ECCES register allows resolution of
@@ -984,8 +979,6 @@ ppc4xx_edac_init_csrows(struct mem_ctl_info *mci, u32 mcopt1)
 			dimm->dtype	= dtype;
 
 			dimm->edac_mode	= edac_mode;
-
-		ppc4xx_last_page += csi->nr_pages;
 		}
 	}
 
diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
index 21147ac..d5892c0 100644
--- a/drivers/edac/sb_edac.c
+++ b/drivers/edac/sb_edac.c
@@ -642,8 +642,6 @@ static int get_dimm_config(struct mem_ctl_info *mci)
 				 * csrows.
 				 */
 				csr = &mci->csrows[csrow];
-				csr->first_page = last_page;
-				csr->last_page = last_page + npages - 1;
 				csr->nr_pages = npages;
 				csr->csrow_idx = csrow;
 				csr->nr_channels = 1;
diff --git a/drivers/edac/tile_edac.c b/drivers/edac/tile_edac.c
index c870f68..54067c4 100644
--- a/drivers/edac/tile_edac.c
+++ b/drivers/edac/tile_edac.c
@@ -110,9 +110,7 @@ static int __devinit tile_edac_init_csrows(struct mem_ctl_info *mci)
 		return -1;
 	}
 
-	csrow->first_page = 0;
 	csrow->nr_pages = mem_info.mem_size >> PAGE_SHIFT;
-	csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
 	dimm->grain = TILE_EDAC_ERROR_GRAIN;
 	dimm->dtype = DEV_UNKNOWN;
 
diff --git a/drivers/edac/x38_edac.c b/drivers/edac/x38_edac.c
index f7cc4d2..bc7f880 100644
--- a/drivers/edac/x38_edac.c
+++ b/drivers/edac/x38_edac.c
@@ -319,7 +319,6 @@ static int x38_probe1(struct pci_dev *pdev, int dev_idx)
 	int rc;
 	int i, j;
 	struct mem_ctl_info *mci = NULL;
-	unsigned long last_page;
 	u16 drbs[X38_CHANNELS][X38_RANKS_PER_CHANNEL];
 	bool stacked;
 	void __iomem *window;
@@ -363,7 +362,6 @@ static int x38_probe1(struct pci_dev *pdev, int dev_idx)
 	 * cumulative; the last one will contain the total memory
 	 * contained in all ranks.
 	 */
-	last_page = -1UL;
 	for (i = 0; i < mci->nr_csrows; i++) {
 		unsigned long nr_pages;
 		struct csrow_info *csrow = &mci->csrows[i];
@@ -375,9 +373,6 @@ static int x38_probe1(struct pci_dev *pdev, int dev_idx)
 		if (nr_pages == 0)
 			continue;
 
-		csrow->first_page = last_page + 1;
-		last_page += nr_pages;
-		csrow->last_page = last_page;
 		csrow->nr_pages = nr_pages;
 
 		for (j = 0; j < x38_channel_num; j++) {
-- 
1.7.8