On Jun 17, 2013, at 9:58 PM, Bruce Ashfield <bruce.ashfi...@windriver.com> wrote:
> On 13-06-18 12:41 AM, Khem Raj wrote: >> >> On Jun 17, 2013, at 9:37 PM, Bruce Ashfield <bruce.ashfi...@windriver.com> >> wrote: >> >>> On 13-06-17 11:30 PM, Khem Raj wrote: >>>> Hi Bruce and All >>>> >>>> Finally after a long innings I have diagnosed the mystery behind the below >>>> segfault that we see on kernel 3.8 which compiled with gcc 4.8 but don't >>>> show when compiled with gcc 4.7 >>>> >>>> >>> >>> There also seems to be a follow up patch: >>> >>> commit 418df63adac56841ef6b0f1fcf435bc64d4ed177 >>> Author: Nicolas Pitre <nicolas.pi...@linaro.org> >>> Date: Tue Mar 12 13:00:42 2013 +0100 >>> >>> ARM: 7670/1: fix the memset fix >>> >>> Commit 455bd4c430b0 ("ARM: 7668/1: fix memset-related crashes caused by >>> recent GCC (4.7.2) optimizations") attempted to fix a compliance issue >>> with the memset return value. However the memset itself became broken >>> by that patch for misaligned pointers. >>> >>> This fixes the above by branching over the entry code from the >>> misaligned fixup code to avoid reloading the original pointer. >>> >>> Also, because the function entry alignment is wrong in the Thumb mode >>> compilation, that fixup code is moved to the end. >>> >>> While at it, the entry instructions are slightly reworked to help dual >>> issue pipelines. >>> >>> Signed-off-by: Nicolas Pitre <n...@linaro.org> >>> Tested-by: Alexander Holler <hol...@ahsoftware.de> >>> Signed-off-by: Russell King <rmk+ker...@arm.linux.org.uk> >>> >>> :100644 100644 d912e73... 94b0650... M arch/arm/lib/memset.S >>> >>> -------- >>> >>> I've staged it as well, and will do a boot test in the morning once >>> my build has completed. Time to call it a night here. >> >> I did not need anything other than the first patch to get over the segfault. >> but yes it completes the fix >> so having both is better > > So very strange. I got one segfault, and then this: > > Linux version 3.8.13-yocto-standard (bruce@yow-bashfiel-d2) (gcc version > 4.8.1 (GCC) ) #2 PREEMPT Tue Jun 18 00:36:55 EDT 2013 > > <snip> > > qemuarm login: root > root@qemuarm:~# uname -a > Linux qemuarm 3.8.13-yocto-standard #2 PREEMPT Tue Jun 18 00:36:55 EDT 2013 > armv5tejl GNU/Linux > > ---------------- > > Which means I may have just been unlucky on my testing with 3.10, or something > else is going on. Well I have been booting latest linus's (3.10-rc6) master compiled with gcc 4.8 just one patch from linux-yocto see below http://git.yoctoproject.org/cgit/cgit.cgi/linux-yocto-3.8/commit/?h=standard/arm-versatile-926ejs&id=351d133943b50a9dfeee07661d44254722a19f04 I wonder why this patch hasn't made upstream yet. _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto