On 4/2/2014 5:09 PM, Helge Deller wrote:
On 04/02/2014 09:09 PM, Carlos O'Donell wrote:
On Tue, Apr 1, 2014 at 2:49 PM, Helge Deller <deller@xxxxxx> wrote:
Yes.
But it's not a kernel bug. Kernel 3.14 and previous stable releases are OK.
I did proposed a glibc change in my previous mail (http://www.spinics.net/lists/linux-parisc/msg05384.html).
Debian bug report with patch is here:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=741243
And this is what I proposed:
A trivial FIX/workaround would be to change libc-mmap.h like this:
#ifdef __hppa__
#define MAP_FIXED_ALIGNMENT 4096
#else
#define MAP_FIXED_ALIGNMENT SHMLBA
#endif
That works because then the new aligned address is then the same as the original
(the mmap call returns 4k aligned addresses, so it stays unchanged), but I'm not sure
if such a patch would be acceptable.
Do you have another idea/proposal?
The responsibility for fixing this falls to me, but I've been busy.
No problem.
If someone wants to propose a patch for glibc please email
libc-alpha@xxxxxxxxxxxxxx, TO me, and I'll review and commit the patch
granted that you show you've done the appropriate testing.
Otherwise I'll get to this at some point in the next couple of weeks :-(
Hi Carlos,
I'm not really sure if my patch is the best way to go. Technically it's correct
and it's tested since all our debian buildservers currently run with this patch.
But all other options would probably involve more code changes.
So, I think I'm happy if you can look at it at some point when you find time.
Your input would be very valuable here.
I'm wondering if kernel value for SHMLBA shouldn't change to PAGE_SIZE
to better
reflect that attach addresses are page aligned. The color alignment for
shared maps
seems a separate issue which maybe userspace doesn't need to worry about.
Dave
--
John David Anglin dave.anglin@xxxxxxxx
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