Hello Benjamin,
Benjamin Herrenschmidt wrote:
[snip]
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index fce2df9..4f802df 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -20,7 +20,9 @@
beq 1f; \
mfspr r1,SPRN_SPRG3; /* if from user, start at top of */\
lwz r1,THREAD_INFO-THREAD(r1); /* this thread's kernel stack */\
- addi r1,r1,THREAD_SIZE; \
+ lis r11,[EMAIL PROTECTED]; \
+ ori r11,r11,[EMAIL PROTECTED];
\
+ add r1,r1,r11;
\
It would be nice if we could avoid the extra instruction here when the
page sizes isn't big enough to require it.
As a matter of fact, I don't see why THREAD_SIZE should ever need that,
there is no reason to change the kernel stack size.
Well, this was introduced because of that:
kernel/fork.c [179]:
max_threads = mempages / (8 * THREAD_SIZE / PAGE_SIZE);
With THREAD_SIZE=8K we will get mempages divided by zero if PAGE_SIZE is
bigger than 64K. (Well, another reason not to use >64K pages). Not sure
this is the right way to fix it.
Regards, Ilya.
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