PROT_SEM in 2.5.7pre1 on Sparc question

PROT_SEM in 2.5.7pre1 on Sparc question

[Holzrichter, Bruce]

Hello,

I am playing around with 2.5.7pre1 on Sparc64 platform.  There's a new flag
definition in mman.h for PROT_SEM set to 0x8.  Right now, the proper def is
not in the sparc tree,  Dave may already have seen this, I diff'd the file
below, if your interested, that will allow the kernel compile to complete.  

I see that this is related to the fast user space mutexes.  I have been
reading up the LKML notes I have found on this, but I am wondering if there
are any implications on this for the Sparc architecture?  I don't have a
working kernel yet for testing.  But was wondering if you had any thoughts
on this.

Thanks
Bruce Holzrichter

-------------------------------------------------------------

--- include/asm-sparc64/mman.h.old	Fri Mar 15 12:03:57 2002
+++ include/asm-sparc64/mman.h	Fri Mar 15 12:05:07 2002
@@ -7,6 +7,7 @@
 #define PROT_READ	0x1		/* page can be read */
 #define PROT_WRITE	0x2		/* page can be written */
 #define PROT_EXEC	0x4		/* page can be executed */
+#define PROT_SEM		0x8		/* page may be used for
atomic ops */
 #define PROT_NONE	0x0		/* page can not be accessed */
 
 #define MAP_SHARED	0x01		/* Share changes */

Re: PROT_SEM in 2.5.7pre1 on Sparc question

[David S. Miller]

It's defined in the bitkeeper 2.5.x tree already.