lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Wed, 25 Jan 2017 16:37:28 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     David Binderman <dcb314@...mail.com>
Cc:     Mauro Carvalho Chehab <mchehab@....samsung.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: edac/i7300_edac.c:307: strange macro ?

On Wed, Jan 25, 2017 at 12:04:04PM +0000, David Binderman wrote:
> You'll have a very long wait to get a linux patch from me.
> 
> I am happy for someone else to invent a patch.

Ah ok, I thought you wanted to give it a try and would want me to help
you with it. :-)

Anyway, here it is:

---
From: Borislav Petkov <bp@...e.de>
Date: Wed, 25 Jan 2017 16:08:27 +0100
Subject: [PATCH] EDAC, i7300: Test for the second channel properly

REDMEMB[17] is the ECC_Locator bit, which, when set, identifies the
CS[3:2] as the simbols in error. And thus the second channel.

The macro computing it was wrong so get rid of it (it was used at one
place only) and get rid of the conditional too. Generates better code
this way anyway.

Signed-off-by: Borislav Petkov <bp@...e.de>
Reported-by: David Binderman <dcb314@...mail.com>
---
 drivers/edac/i7300_edac.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/edac/i7300_edac.c b/drivers/edac/i7300_edac.c
index 0a912bf6de00..e391f5a716be 100644
--- a/drivers/edac/i7300_edac.c
+++ b/drivers/edac/i7300_edac.c
@@ -304,7 +304,6 @@ static const char *ferr_global_lo_name[] = {
 #define REDMEMA		0xdc
 
 #define REDMEMB		0x7c
-  #define IS_SECOND_CH(v)	((v) * (1 << 17))
 
 #define RECMEMA		0xe0
   #define RECMEMA_BANK(v)	(((v) >> 12) & 7)
@@ -483,8 +482,9 @@ static void i7300_process_fbd_error(struct mem_ctl_info *mci)
 		pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
 				     REDMEMB, &value);
 		channel = (branch << 1);
-		if (IS_SECOND_CH(value))
-			channel++;
+
+		/* Second channel ? */
+		channel += !!(value & BIT(17));
 
 		/* Clear the error bit */
 		pci_write_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
-- 
2.11.0

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

Powered by blists - more mailing lists