summaryrefslogtreecommitdiff
path: root/Documentation/metag
diff options
context:
space:
mode:
authorAndy Lutomirski <luto@amacapital.net>2015-03-07 04:50:19 +0300
committerIngo Molnar <mingo@kernel.org>2015-03-07 11:34:03 +0300
commita7fcf28d431ef70afaa91496e64e16dc51dccec4 (patch)
tree3de032435c43db84cdfc4f7e46df4d118b86fe82 /Documentation/metag
parentb27559a433bb6080d95c2593d4a2b81401197911 (diff)
downloadlinux-a7fcf28d431ef70afaa91496e64e16dc51dccec4.tar.xz
x86/asm/entry: Replace this_cpu_sp0() with current_top_of_stack() and fix it on x86_32
I broke 32-bit kernels. The implementation of sp0 was correct as far as I can tell, but sp0 was much weirder on x86_32 than I realized. It has the following issues: - Init's sp0 is inconsistent with everything else's: non-init tasks are offset by 8 bytes. (I have no idea why, and the comment is unhelpful.) - vm86 does crazy things to sp0. Fix it up by replacing this_cpu_sp0() with current_top_of_stack() and using a new percpu variable to track the top of the stack on x86_32. Signed-off-by: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: 75182b1632a8 ("x86/asm/entry: Switch all C consumers of kernel_stack to this_cpu_sp0()") Link: http://lkml.kernel.org/r/d09dbe270883433776e0cbee3c7079433349e96d.1425692936.git.luto@amacapital.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation/metag')
0 files changed, 0 insertions, 0 deletions