Messages in this thread | | | Subject | Re: 2.6.14-rc3-rt10 crashes on boot | From | John Rigg <> | Date | Sun, 09 Oct 2005 17:28:47 +0100 |
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On Friday, October 7 Steven Rostedt wrote:
>Here's an addon patch to my last one. I don't know x86_64 very well, but >I believe the the asm is pretty much the same, so this patch removes the >check for __i386__ and also defines STACK_WARN.
>Index: linux-rt-quilt/include/asm-x86_64/page.h >=================================================================== >--- linux-rt-quilt.orig/include/asm-x86_64/page.h 2005-10-06 08:04:00.000000000 -0400 >+++ linux-rt-quilt/include/asm-x86_64/page.h 2005-10-07 15:34:20.000000000 -0400 >@@ -21,6 +21,8 @@ > #endif > #define CURRENT_MASK (~(THREAD_SIZE-1)) > >+#define STACK_WARN (THREAD_SIZE/8) >+ > #define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1)) > #define LARGE_PAGE_SIZE (1UL << PMD_SHIFT) > >Index: linux-rt-quilt/kernel/latency.c >=================================================================== >--- linux-rt-quilt.orig/kernel/latency.c 2005-10-06 08:04:56.000000000 -0400 >+++ linux-rt-quilt/kernel/latency.c 2005-10-07 15:31:20.000000000 -0400 >@@ -377,7 +377,8 @@ > atomic_inc(&tr->disabled); > > /* Debugging check for stack overflow: is there less than 1KB free? */ >-#ifdef __i386__ >+#if 1 // def __i386__ >+ /* Hopefully this works on x86_64! */ > __asm__ __volatile__("andl %%esp,%0" : > "=r" (stack_left) : "0" (THREAD_SIZE - 1)); > #else
Steve, thanks for these patches. I got it to compile with 2.6.14-rc3-rt12 but had to change the assembly lines in (patched) latency.c to
__asm__ __volatile__("and %%rsp,%0" : "=r" (stack_left) : "0" (THREAD_SIZE - 1));
ie. `and' instead of `andl' and `%%rsp' instead of `%%esp'. Somebody who understands x86_64 assembly better than I do should probably check this before anyone tries using it. While I was at it I changed a printk arg in line 335 of (patched) latency.c - I think the last %d should be %ld, ie.
printk("| new stack-footprint maximum: %s/%d, %ld bytes (out of %ld bytes).\n", worst_stack_comm, worst_stack_pid, MAX_STACK-worst_stack_left, MAX_STACK);
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